Wanderley Amorim | UFCG - Universidade Federal de Campina Grande (original) (raw)

Papers by Wanderley Amorim

Proceedings of the 4th Brazilian Conference on Composite Materials, 2018

In applications that require impact loading, polymeric matrix composites reinforced with aramid f... more In applications that require impact loading, polymeric matrix composites reinforced with aramid fibers stand out, especially in relation to metals, due to characteristics such as high specific strength and stiffness, which give rise to light high-performance systems. However, such structures can fail through various modes, requiring comprehensive studies. Under lowvelocity impact, the contact time between the impactor and the target is relatively large, and the effects of deformation rate and wave propagation are generally insignificant, allowing association of the damage caused in the composites via drop-weight (DW) to those of quasistatic indentation (QSI) tests, optimizing the overall material understanding. Thus, this work aims to comparatively analyze force × displacement curves and resulting damage from dropweight and QSI tests. For that, laminates (2.5, 4.5 and 7.0 mm thick) were tested using variable impact energies (15, 30, 45 and 60 J) and displacement (11, 12 and 15 mm). Similarities in force × displacement curves and damage mechanisms between QSI and DW results were observed at the perforating threshold. However, to compare the response of the material and the damage mechanism generated by QSI and Drop-weight tests in composites, care must be taken, since there are many variables involved and the response of the composites to these tests will depend on such variables.

Research, Society and Development, 2021

The aim of this work is to analyze resin flow during RTM manufacturing of GFRP composites contain... more The aim of this work is to analyze resin flow during RTM manufacturing of GFRP composites containing embedded impermeable inserts. High-density polyethylene inserts were embedded in the composites during processing via vacuum assisted resin transfer molding (RTM). The processing station plate was assembled so that digital image analysis of flow during and after processing could be taken. Three-point bending test specimens were cutout from the plates and their fractured surfaces were analyzed by optical fractography. Results indicate the inserts to block transverse resin flow making it difficult to wet the fibers thoroughly, which led to non-uniform plate thickness. Resin rich regions near the sides of the inserts were observed. Three-point bending failure mode analysis showed the occurrence of fiber delamination by type II shear stress, detachment between the fiber/matrix interface and the insert, and fracture of the composite to proceed by crack propagation through the resin rich...

Journal of Materials Engineering and Performance

Journal of Intelligent Material Systems and Structures

Active flexible composites can be developed through the coupling of silicone matrices and smart m... more Active flexible composites can be developed through the coupling of silicone matrices and smart materials such as NiTi shape memory alloys (SMA). This work evaluates the mechanical behavior and adhesion of NiTi SMA ribbons embedded in a silicone matrix for the development of active flexible composites. Ribbons with cross-section of 0.15 × 0.8 mm2 were cold-rolled from superelastic NiTi wires with 0.4 mm in diameter. These ribbons were heat treated to either obtain characteristics of superelasticity (SE) or shape memory effect (SME) at room temperature. Silicone, NiTi wire, and ribbons were characterized by Differential Scanning Calorimetry (DSC), Dynamic Mechanical Analysis (DMA), and tensile tests. Adhesion between SMA ribbons and silicone matrix was evaluated with pull-out tests. The use of an adhesion promoter proved to be indispensable to ensure a good pull-out strength and shear stress at the NiTi ribbon and silicone interface. A silicone rubber cylinder with an embedded SME ri...

Journal of Materials Engineering and Performance

Journal of Composite Materials

The aim of this study was to analyze the effect of hybridization on impact and residual strength ... more The aim of this study was to analyze the effect of hybridization on impact and residual strength in composites as well as the types of damage caused by the impacts, quantifying the delaminated area of the test specimens. Two 11-layer composite laminates were developed, one with bidirectional glass fiber woven and the other a hybrid with three layers of bidirectional aramid fiber substituting the outer layers and the middle layer of the glass fiber. The materials revealed that the hybrid laminate obtained greater impact strength withstanding one impact of 76 J, albeit with an increase in the damaged area of between 64 and 85 cm2, resulting in a decline in mechanical properties along nearly the entire test specimen. This contrasts with what occurred in the glass fiber laminates, which recovered over 80% of their mechanical properties for a distance of 35 mm from the edge of the impactor. Moreover, it demonstrated that the variation in residual strength can be represented by an equatio...

SAE Technical Paper Series

Journal of Composite Materials

The Journal of Strain Analysis for Engineering Design

This study aimed to develop a model to analyze the residual strength of composites after low-velo... more This study aimed to develop a model to analyze the residual strength of composites after low-velocity impact, using three-point bending and compression after impact tests. Two types of composite laminates with an orthophthalic polymer matrix were used: one reinforced with bidirectional E-glass fabric and the other reinforced with bidirectional Kevlar-49 fabric. To that end, an equation was developed to assess loss of strength and stiffness after impact at different distances from the impact point, and this equation was not found in any previously searched article. The results demonstrate that the laminate based in glass fiber is more appropriate for the repair process.

Materials Science Forum, 2016

In the last decades, the composite materials were used in the modern ballistic armor systems. Thu... more In the last decades, the composite materials were used in the modern ballistic armor systems. Thus, techniques have been developed to predict its mechanical properties, damage mechanisms and strength associated to ballistic impact penetration. The objective of this work was the ballistic impact and quasi-static punch shear behavior of fiberglass polymer composites. The materials used in the experiments were: woven fabric and chopped strand mat E-glass fiber and polyester resin. The composites submitted to ballistic impact and quasi-static punch shear tests had 1, 5, 10, 15, and 20 layers and 5, 8, 10, 12, 14, 15, and 20 layers, respectively. A quasi-static punch shear fixture test was developed. The best ballistic performance composite was the 10 layers woven fabric. In quasi-static punch shear test, it was possible to analyze the internal fracture of composites, and the load x displacement behavior was observed.

Materials Science Forum, May 31, 2010

The objective of this work was the development of a processing methodology to embedding NiTi fibe... more The objective of this work was the development of a processing methodology to embedding NiTi fibers into a polymer-based composite plate. A carbon fiber reinforced polymer (CFRP) prepreg and NiTi thin wires were used. A uniaxial hot press was prepared to be used in the composite processing. Two prototypes were fabricated to provide fiber alignment and fixation fixture. A CFRP composite plate without fiber and with NiTi fibers were processed. Micrometers and a universal materials testing machine were used to measure the plate thickness and Young's modulus. It was possible to develop a processing methodology to embedding NiTi fiber into a polymer-based composite plate. The CFRP plate without fiber presented almost no variation in plate thickness and Young's modulus measurement thus enabling the CFRP manufacture by the hot uniaxial press. The fiber fixation fixture developed was able to produce CFRP-NiTi fiber hybrid composites with different number of fibers embedded, the spacing distance between fibers was at least 1 mm and the fiber alignment was achieved.

In the last decades, the composite materials were used in the modern ballistic armor systems. Thu... more In the last decades, the composite materials were used in the modern ballistic armor systems. Thus, techniques have been developed to predict its mechanical properties, damage mechanisms and strength associated to the ballistic impact penetration. The objective of this work was the ballistic impact and quasi-static punch shear behavior of fiberglass polymer composites. The materials used in the experiments were: woven fabric and chopped strand mat E-glass fiber and polyester resin. The composites submitted to ballistic and quasi-static Punch Shear tests had 1, 5, 10, 15 and 20 layers and 5, 8, 10, 12, 14, 15 and 20 layers respectively. A quasi-static Punch Shear fixture test was developed. The best ballistic performance composite was the 10 layers woven fabric. In quasistatic Punch Shear test, it was possible to analyze the internal fracture of composites, the load x displacement behavior was observed and a fracture analyze correlations between quasi-static Punch Shear and Ballistic damage were done.

The increasing development of reinforced composite materials occurred in recent years has provide... more The increasing development of reinforced composite materials occurred in recent years has provided new alternatives to solve various problems about the needs of new materials with combinations of properties. To utilize such materials we perform several mechanical tests, such as tensile, compression, flexural and impact mainly. Knowing that the composite laminates are designed according to the conservative practices for working with loads below the last loading capacity and no need to estimate how much these materials can withstand the damage is justified, then this work, which aims to design a machine drop weight impact to composite materials. Studies have been made about composite materials and impacts on laminated structures. Based on these studies and the state of the art about the design of several drop weight impact machines, a machine impact of simple design was projected. The machine has a projected range of impact energy between 20J and 90J obtained by variation of the drop ...

teses.ufrj.br

Devido às suas elevadas propriedades mecânicas específicas, os materiais compósitos estão enfrent... more Devido às suas elevadas propriedades mecânicas específicas, os materiais compósitos estão enfrentando demandas novas, onde a capacidade de produção em massa a um custo mais acessível se tornou indispensável. A Moldagem por Transferência de Resina ou RTM (Resin Transfer Molding) constitui um promissor processo de fabricação de materiais compósitos. O objetivo deste trabalho é o estudo experimental do processo de infusão durante a fabricação de placa espessa por RTM. Os materiais usados nos experimentos foram: tecido de fibra de vidro e resina éster-vinílica com catalisador Butanox e acelerador CoNaP. As placas de material compósito eram constituídas de 32 camadas de fibra de vidro com espessura de 25,4 mm. Dois tipos de experimentos foram realizados: o primeiro para medir a influência do sistema de injeção de resina no processamento e o segundo para medir a influência da quantidade de resina presente no reservatório de injeção. Nos processamentos realizados, o sistema de injeção de resina alterou o tempo de preenchimento da preforma. A variação na quantidade de resina no reservatório não só alterou os tempos de preenchimento como impediu o preenchimento da preforma em um dos processamentos realizados. Não foi possível impedir o fenômeno de race-tracking. Baseando-se nos experimentos realizados, pode-se concluir que: o sistema de injeção de resina é importante no real entendimento do processamento por RTM e que a quantidade de resina no reservatório de injeção pode influenciar o processamento por RTM. Palavras chaves: Materiais compósitos, processamento de materiais compósitos, moldagem por transferência de resina.

Assault Grenade launcher history paper in portuguese.

Development of a motorcycle for internacional competion Motostudent_ Bachelor thesis in Portug... more Development of a motorcycle for internacional competion Motostudent_ Bachelor thesis in Portuguese

Motorcycle suspension dynamometer conceptual project_ Bachelor thesis in Portuguese

Motorcycle riding simulator conceptual project_ Bachelor thesis in Portuguese

Proceedings of the 4th Brazilian Conference on Composite Materials, 2018

Research, Society and Development, 2021

Journal of Materials Engineering and Performance

Journal of Intelligent Material Systems and Structures

Journal of Materials Engineering and Performance

Journal of Composite Materials

SAE Technical Paper Series

Journal of Composite Materials

The Journal of Strain Analysis for Engineering Design

Materials Science Forum, 2016

Materials Science Forum, May 31, 2010

In the last decades, the composite materials were used in the modern ballistic armor systems. Thu... more In the last decades, the composite materials were used in the modern ballistic armor systems. Thus, techniques have been developed to predict its mechanical properties, damage mechanisms and strength associated to the ballistic impact penetration. The objective of this work was the ballistic impact and quasi-static punch shear behavior of fiberglass polymer composites. The materials used in the experiments were: woven fabric and chopped strand mat E-glass fiber and polyester resin. The composites submitted to ballistic and quasi-static Punch Shear tests had 1, 5, 10, 15 and 20 layers and 5, 8, 10, 12, 14, 15 and 20 layers respectively. A quasi-static Punch Shear fixture test was developed. The best ballistic performance composite was the 10 layers woven fabric. In quasistatic Punch Shear test, it was possible to analyze the internal fracture of composites, the load x displacement behavior was observed and a fracture analyze correlations between quasi-static Punch Shear and Ballistic damage were done.

teses.ufrj.br

Assault Grenade launcher history paper in portuguese.

Motorcycle suspension dynamometer conceptual project_ Bachelor thesis in Portuguese

Motorcycle riding simulator conceptual project_ Bachelor thesis in Portuguese

DEVELOPMENT AND TEST OF AN ELECTRONIC SUNSHINE DURATION MONITORING DEVICE, 2019

From the 19th century, with the advent of instrumentation, it was possible to establish global sc... more From the 19th century, with the advent of instrumentation, it was possible to establish global scale monitoring for a specific set of climate variables, including daily sunlight or sunshine. Sunstroke is defined as the astronomical duration of the day or the number of hours of sunshine that appear outside the clouds, thus allowing the direct component of radiation to reach the Earth's surface. Daily sunlight measurement is performed using the Campbell-Stokes Heliograph, which, although a consolidated method over the past 100 years, is still performed directly using special instruments that make use of an operator's reading and interpretation to assess the duration. effective daytime. In order to improve the insolation monitoring, allowing its measurement in a wider range of locations was developed in the laboratory and tested an electronic device with logic Fuzzy. The device tested showed disparities of up to 11% compared to official data from the National Institute of Meteorology.

EXPERIMENTATION OF A LOW COST ELECTRONIC SYSTEM FOR MEASUREMENT OF THE ULTRAVIOLET RADIATION INDEX TO THE CITY OF CAMPINA GRANDE, BRAZIL, 2019

Ultraviolet radiation represents approximately 7% of the electromagnetic spectrum emitted by the ... more Ultraviolet radiation represents approximately 7% of the electromagnetic spectrum emitted by the Sun. Due to the risks associated with sun exposure, the World Health Organization in collaboration with international organizations developed the Ultraviolet Index, using it to simplify the measurement of the level of ultraviolet radiation incident on the Earth's surface. Motivated by the large number of cases of skin cancer registered in Brazil this work aims to present the readings taken from a wireless system for measurement of ultraviolet radiation in format of Ultraviolet Index. Measurements were carried out in the city of Campina Grande (Brazil) for 76 days, where it was verified that the Ultraviolet Index reaches the Extreme Risk of exposure to the sun still early in the morning remaining until the beginning of the afternoon and that the daily maximum value occurs nearby noon.

Conference paper , 2016

Armored vehicles are extremely heavy structures, because they are traditionally protected by stee... more Armored vehicles are extremely heavy structures, because they are traditionally protected by steel armor. As protection and mobility of these vehicles are the key factors regarding their survival in a combat situation, new materials, structures and design concepts that focus on the use of lighter materials are desirable in these applications. Accordingly, composites are an alternative for the production of lightweight and high performance armor. This study aimed the processing by infusion of aramid-fiber/epoxy composites and their characterization. The composite plates produced (3-12 mm thickness) were characterized by acoustic inspection microscopy, optical microscopy (OM) and density analyses. It was noticed that the molded plates showed somewhat variable thickness and density along their length. In the thicker plates, there was greater heterogeneity. Therefore improvements in the manufacturing process, such as repositioning of inlet and outlet gates, and increasing vacuum pressure were implemented in order to obtain a more controlled process with repeatability.

For over 10 years there is no record of any contribution, even in form of model of utility, intro... more For over 10 years there is no record of any contribution, even in form of model of utility, introducing any
differential in the ceramic blocks for masonry. Since the replace of the solid ceramic blocks for leaked ceramic blocks,
there was the necessity of introducing one intermediate step in the construction, the spatterdash, to fix the
plaster or stucco on masonry closing. The main objective of this paper was to development of a sustainable ceramic
block for fencing capable of eliminate the step of spatterdash in the industry of construction. The project was
developed through a series of steps of conception, manufacture of machines and product test in chronological
sequence. Only then was possible the development of a sustainable ceramic block for masonry of fencing more light
and capable to eliminate the step of spatterdash. The ceramic block developed also presented: a reduction in the time
of storage in the cold, best cure, uniform burning, incresing compressive strength and specially a reduction in the
wood consume in the energetic matrix of the process.

Composite mechanical and thermomechanical characterization with variation of ply stacking sequenc... more Composite mechanical and thermomechanical characterization with variation of ply stacking sequence _in Portuguese

The objective of this work was design a laboratorial Resin Transfer Moulding Equipment to process... more The objective of this work was design a laboratorial Resin Transfer Moulding Equipment to process composites. The following methodology was fulfilled: Design and manufacture of the equipment, testing its process capabilities, injection tests in the processing stations, manufacturing of composite plates and further characterization. The materials used in the experiments were glass fiber mat (450g / m2), base glass fiber fabric (600 g / m2), a medium viscosity 1.0 Arazyn Ara Ashland ® # 08 unsaturated polyester resin and 50 Butanox. Small and large area plates were produced with dimensions of: 175x125x5mm and 340x340x5mm respectively. Based on the results experiments, it is concluded that it was possible the design, development and manufacture of a resin injection equipment RTM for laboratory use with low cost and low energy losses, for the manufacture of composites with two reinforcement kind: mat and fabric, with different weights and thin.

Because of their high specific mechanical properties, composite materials are facing new demands,... more Because of their high specific mechanical properties, composite materials are facing new demands, where the large scale production capacity with low cost became important.
Resin Transfer Molding (RTM) constitutes a promising process of composite materials manufacturing. In the typical processing of RTM, initially the preform (reinforcements in
the format of the part) is prepared and located in the mold. It is then closed and the preform is compressed to a defined fiber volumetric fraction. After that, the resin is injected in
the mold and the reinforcements are impregnated. Finally, after the cure of the resin, the mold is opened and the part is removed. If necessary, the part can be submitted to a postcure
in order to reach the maximum of its properties. The objective of this work is the mechanical characterization of composites manufactured by Resin Transfer Molding. Analysing the experiments, it can be concluded that: a) The layers number variation
controls the resin quantity injected in the preform, the resin filling time and
consequently the composite quality. The composite with 30 layers presented superior
quality processing. The tensile test curve of the 30 layer-composite presents a bilinear
behavior with a maximum rupture tension equals to 266.96 MPa, an elasticity modulus
equals to 13.49 MPa and a maximum compression tension equals to 176.73 MPa. It
was not possible to correlate the ballistic behavior with composite processing.
Probably this correlation could be obtained with more ballistic tests

The use of NiTi shape memory alloys (SMA) working in superelastic regime cover various fields of ... more The use of NiTi shape memory alloys (SMA) working in superelastic regime cover various fields of applications
such as medicine, dentistry and civil engineering, making it necessary a more specific knowledge of the behavior of these
special materials when subjected to cyclic mechanical stresses. Therefore, experimental studies concerning fatigue
behavior of these functional materials is of fundamental importance to support design of applications. The tests
performed in this work have focused on evaluating the fatigue behavior of superelastic NiTi SMA (NiTiNOL) wires
subjected to tensile loading controlled by mechanical stress, determining the evolution of some functional properties.
The functional parameters evaluated were dissipated energy, transformation stresses, accumulated strains and
superelastic strains, determined according to the intensity of mechanical tensile stress, which was varied between 500
MPa and 800MPa, at a frequency of 1 Hz. It was verified that the performance characteristics of the Nitinol wires
depends directly of the tensile stress and number of cycles. For the first cycle, the dissipated energy (ED), accumulated
strain (εp) and superelastic strain (εSE), increases with increasing the peak stress. In general, increasing the number of
cycles leads to more accumulation of εp causing a reduction of ED and εSE in a low cycle fatigue behavior.

The objective of this work is an experimental study the biodiesel kinematic viscosity variation w... more The objective of this work is an experimental study the biodiesel kinematic viscosity variation with
temperature influence on the diesel engine operating with biodiesel. Various types of fuel were used: soy biodiesel
(from Pernambuco State biodiesel pilot plant) and cotton biodiesel from Laboratory and Supercritical Biodiesel
Technology, Federal University of Rio Grande do Norte (UFRN). The experimental tests were performed by the
Experimental Thermal Machines Laboratory (LEMT) from the Federal University of Campina Grande (UFCG) in
Northwest, Brazil. The viscosity’s tests were performed with the Saybolt viscometer, from Petrotest and the density test
were performed with graduated densimeter in the standard range. Preliminary results indicate a difficulty in starting
the engine because the fuels viscosity values were above the maximum recommended by the Brazilian National Agency
of Petroleum, Natural Gas and Biofuels (ANP) standards and were also observed, to temperature above 60ºC, the
viscosity value decreases below the recommend by ANP standard, especially in the case of cotton biodiesel. The
behavior of viscosity variation on each tested fuels are being test in an engine to observe the influence of this
parameter on the operation engine including the ease and difficulty in starting and its influence on exhaust gases.

The objective of this research project is to develop a technology for the manufacture of ballist... more The objective of this research project is to develop a technology for the manufacture of
ballistic laminate by RTM process. This project consists of two phases: in the first one, a RTM
apparatus is set up and in the second one composite plates for ballistic applications will be
manufactured by RTM. This work presents the results of the first phase of this project.

In this work, active composites of epoxy resin containing Ni-Ti Shape Memory Alloy (SMA) thin wir... more In this work, active composites of epoxy resin containing Ni-Ti Shape Memory Alloy (SMA) thin wires were
fabricated to evaluate its thermomechanical behavior in the range of phase transformation of SMA during heating. The
epoxy resin system employed was prepared using bifunctional diglycidyl ether of bisphenol A (DGEBA) and
crosslinking agent triethylenetetramine (TETA). The evaluated ratio DGEBA/TETA was 100:20 and the SMA
volumetric fraction of Ni-Ti wires were 1.9 % and 3.8 %. The phase transformation of the Ni-Ti SMA wires were
determined by Differential Scanning Calorimetry (DSC) and the specimens of the epoxy – SMA active composites were
characterized by Dynamic Mechanical Analysis (DMA). According to the DMA results it was evidenced a significant
increase of storage modulus in the active composite during heating in the range of the phase transformation of Ni-Ti
SMA wires when the volumetric fraction is of the order of 3.8 %. Moreover, when small amounts of SMA were
incorporated, as for example, 1.9 %vol., no effect was observed because the SMA content was not enough for the phase
transformation of the Ni-Ti wires act on the epoxy matrix. Finally, these preliminary results have confirmed that
development of smart composites may be expected by using embedded SMA wires in polimeric matrix.

It is common to develop efficient technologies that extract from the natural resources, new mater... more It is common to develop efficient technologies that extract from the natural resources, new materials and products that benefit mankind. This extraction is important because it contributes to the solution of socioeconomic problems in areas less favored like northeast Brazil. There is a lot of industrial waste such as coconut shells. It takes eight years for it to decompose. This causes a serious environmental problem. This paper proposes the development of a conceptual project about a coconut shredder. It was made and inspired by the "Quality Gates System" method and was adapted to the reality of Brazil. This machine will help the environment by recycling the coconut shell. This conceptual proposal consists in shredding. It presents a semiautomatic feeding system with feeder rolls. They should squeeze the coconut shell to remove part of the humidity. After this, a rotor beater composed of six modules with rectangular bars, spaced equally, will receive the squeezed coconut to promote the shredding. Those fibers will go by a small "hedgehog" type rotor which is integrated in the system beater and the fibers will come out clean, being this the final product. It is possible that the conception of this prototype can contribute in the development of clean technologies for the environment, and minimize the impacts caused by mankind.

In the last decades, the composite materials were used in the modern ballistic armor systems. Thu... more In the last decades, the composite materials were used in the modern ballistic armor systems. Thus, techniques have been developed to predict its mechanical properties, damage mechanisms and strength associated to the ballistic impact penetration. The objective of this work was the ballistic impact and quasi-static punch shear behavior of fiberglass polymer composites. The materials used in the experiments were: woven fabric and chopped strand mat E-glass fiber and polyester resin. The composites submitted to ballistic and quasi-static Punch Shear tests had 1, 5, 10, 15 and 20 layers and 5, 8, 10, 12, 14, 15 and 20 layers respectively. A quasi-static Punch Shear fixture test was developed. The best ballistic performance composite was the 10 layers woven fabric. In quasi-static Punch Shear test, it was possible to analyze the internal fracture of composites, the load x displacement behavior was observed and a fracture analyze correlations between quasi-static Punch Shear and Ballistic damage were done.

Bachelor thesis, 2008

In Brazil, as well as, in the world there is a tendency of development of new technologies to ext... more In Brazil, as well as, in the world there is a tendency of development of new technologies to extract of the resources natural, material and new products in an efficient way that it comes to benefit the humanity. The exploration of natural resources stands out as being of fundamental importance for the improvement and the appearance of solutions for socioeconomic problems, especially in less favored areas, as the Northeast of the Brazil. It is perceptible in Brazil, there is a significant waste of several industrialized products, among these the products of vegetable origin, as the coconut peel, it is despised and deposited in the garbage, as well as the margins of the highways, being a material of difficult decomposition that takes more than eight years to decompose. In the search of solutions to recycle this product, tends as consequence the preservation of the environment, the present work proposes the development of a conceptual project of one machine for to defiber coconut green or dry. Such conception was elaborated and based starting from the method "Quality Gates System", and adapted for the Brazilian reality. The conception proposal consists of a defibering, presents in a semiautomatic feeding system with rolls feeders should squeeze green coconut, with intention of removing part of her humidity. Later a rotor beater composed by six modules of rectangular bars, spaced equally will receive the squeezed coconut and to promote the defiber. Those fibers will go by a small rotor, "hedgehog" type, this it is integrated into the system beater, in the which the fiber will come out it cleans, consisting of the final product. It is waited that the conception of this prototype can contribute in a significant way with the development of clean technologies for the environment, in the sense of minimizing the impacts caused by the man's current technological action and your necessity.

Master Thesis , 2019

This research aims to inspect through the infrared thermography technique damages by drop weight ... more This research aims to inspect through the infrared thermography technique damages by
drop weight impact and by almost static indentation in aeronautical composite sandwich
materials type. The motivation arose from the study of aircraft with structures and elements
made of composite materials, where it was found that the load capacity as well as the reliability
of the aircraft to perform flights decreases dramatically when they suffer low speed impacts.
The methodology used made use of a thermal insulation chamber previously designed for
thermographic tests. Drop weight impacts and almost static indentation tests were used to
include different energy levels of damage, followed by the thermographic tests of the plates in
composite materials with and without damages, where we defined the best heating time to
obtain the thermograms. As results, we analyzed the damages in the upper and posterior faces
of the thermographic test, where the damages imposed on the composites with drop weight tests
were more severe than the damages by almost static indentation. For the thermographic test,
thermograms of composites with and without damage were obtained and it was possible to
compare them with the damaged composites, where it was observed that damage type of fiber
breakage was easily identified. Therefore, it was conclude that it is possible to inspect through
thermography in composites sandwiches materials in laboratory environment, but this method
did not show viable to detect lower damages impacts of 15.6 J or lower

Master thesis , 2019

This research aims to evaluate if thermography can detect an increment to the temperature field, ... more This research aims to evaluate if thermography can detect an increment to the
temperature field, which characterizes the presence of failures due to contact fatigue in
cylindrical gears of spurs, from its face. The motivation arose from the study on Tribology,
where it was found that the emergence of failures in machine elements, has as one of its main
characteristics the increase of friction and consequent heat generation. The research is classified
as applied, quantitative, explanatory, experimental and bibliographical. The methodology used
used a bench of tests previously designed for thermographic tests, composed of the following
mechanical elements: electric motor controlled by frequency inverter, vibration dampers,
shafts, bearings, thermal insulation and gears. Thermal tests were carried out from the frame of
the pinion, where temperature values were measured from its face for the following operating
conditions: with and without lubrication in the absence of failures (reference conditions), and
with and without lubrication with the implementation of failures (failure status). Anomalies
were inserted in order to reproduce problems due to contact fatigue wear in a controlled
environment scenario, relative to ambient temperature, relative humidity, engine speed, wind
speed, reflected temperature and emissivity. As results, temperature values were defined for the
reference conditions, where the condition in which the gear couple was lubricated, presented a
lower heat generation and lower temperature variations between the experiments. For the fault
state, the collected data of temperature resemble the reference conditions, not showing a
disturbance to the thermal field due to the presence of the anomalies. Therefore, it is concluded
that it is possible to calibrate via quantitative (active and passive) thermography for cylindrical
gears of straight teeth in a laboratory environment, but this was not shown to be feasible in
detecting the defects inserted in the surface of the teeth.

Bachelor thesis , 2018

Development of a kit to Gun Shot Residue (GSR) analyze by Scanning Electron Microscopy/Energy Dis... more Development of a kit to Gun Shot Residue (GSR) analyze by Scanning Electron Microscopy/Energy Dispersive X-ray Spectroscopy (SEM/EDS)

Bachelor Thesis , 2017

The growing increase in crime requires states to carry out tests to make the investigation proces... more The growing increase in crime requires states to carry out tests to make the investigation process more efficient, as an example of ballistic tests. These procedures, because they are carried out with firearms, require equipment that minimizes the risk of accidents during their operation. One of these devices is the shotgun attached to the universal receiver, which has as one of its functions the operator can carry out the test from a safe distance. The present work aims to design a cartridge firing equipment to test ammunition efficiency using adapters in the firing chamber combustion chamber. For the development of the project, a methodology was used consisting of informational design, conceptual design, preliminary design and detailed design, generating a large database. Thus, four designs were developed, the latter being more suitable for construction according to the specifications and reality of the institution's workshop.

Composite materials are synonymous with good mechanical properties associated with low structural... more Composite materials are synonymous with good mechanical properties associated with
low structural weight and have a great variety of applications in the engineering area.
Taking into account technological advances and the necessity to develop new materials,
make them multifunctional appears as immediate interest. The simplest method to confer
multifunctionality to a composite is through the introduction of inserts into the composites,
giving them the most varied characteristics. It is important to understand how these inserts
will a ect the fabrication process and the structural characterization of the material. The
experimental analysis of the
ow through the preform and the e ects due to the addition
of the impermeable inserts to the composite during the process of Resin Transfer Molding
(RTM) are the objectives of this work. In this work, reinforcement of glass ber fabric and
polyester resin matrix was used in the composition of 250x250x14 mm3 composite materials
sheets with 1 and 9 polyethylene impermeable inserts with dimensions of 50x50x4 mm3,
processed by the RTM Light and VARTM methods for future structural and/or ballistic
application. As expected, introduction of inserts into the preform caused disturbances in
resin
ow during processing, with surface regions in some of the plates above the inserts
where the bers were not wetted. At the end of the processing, variations in the thickness
of the plates were observed, being this a consequence of the ber compaction due to the
presence of the inserts. The movement of the inserts was also identi ed when the resin
inlet and outlet were positioned on di erent planes in the mold. the inserts movimentation
was prevented from attaching the inserts to a mesh before the processing.With the cutting
of the plates, resin-rich regions close to the sides of the inserts were observed, which is a
consequence of the mechanism of ber spacing due to the presence of the inserts. Thus, 4
zones were identi ed in the composites with embedded impermeable inserts. Finally, in
the 3-point bending tests, delamination failures for shear mode II were identi ed in the
specimens.

The present work evaluates the adhesion between Ni-Ti Shape Memory Alloy (SMA) wires and ribbons ... more The present work evaluates the adhesion between Ni-Ti Shape Memory Alloy (SMA)
wires and ribbons embedded into a silicone rubber, for the development of flexible
structures. Adhesion evaluation was performed through pullout tests. To perform the
tests, six types of specimens were produced, in which the wires and ribbons were
embedded in a silicone rubber matrix. Firstly, the ribbons were obtained by cold rolling
of a superelastic Ni-Ti wire. After the cold rolling, the ribbons were subjected to heat
treatment at different temperatures and times in order to obtain two types materials: one
with Superelasticity (SE) property and other with Shape Memory Effect (SME). A Dow
Corning 1200 Primer adhesion promoter was applied to the surfaces of the wires and
ribbons to improve adhesion. Ni-Ti wire and ribbons and silicone rubber were
characterized by Differential Scanning Calorimetry (DSC), Dynamic-Mechanical
Analysis (DMA) and uniaxial tensile tests, to obtain loss factor behavior, elastic
modulus, tensile stress transformations and phase transformation temperatures. Analysis
of tensile loading - unloading test on silicone rubber was also performed to evaluate the
presence of the Mullins effect. For the qualitative verification of the roughness and
adhesion improvement, generated by the cold rolling process and the application of the
primer, respectively, images of Scanning Electron Microscopy (SEM) and Dispersive
Energy Spectroscopy (EDS) in the Ni- Ti wire and ribbons were performed before and
after the pullout tests. The obtained results indicate that the Ni-Ti superelastic wires and
heat treated cold rolled ribbons without primer do not present sufficient adhesion for the
development of silicone rubber flexible structures with embedded Ni-Ti wires and
ribbons, requiring the application of an adhesion promoter (primer) on the surfaces of
the SMA.

Structural Analysis of the Light Sport Aircraft Wing Based on Multhopp's Method

The current scenario of the automotive industry requires the continuous improvement of powertrain... more The current scenario of the automotive industry requires the continuous improvement of powertrain projects, with market demands increasingly rigorous, that looks towards the maximum reduction of fuel consumption without losses related to the vehicle performance. However, thefabrication of countless automotive prototypes for tests and validation has become, during the last decades, a not effective and lasting method regarding the pursuing of the project optimization. The
purpose of this study is modeling and simulating a SUV 4WD vehicle with automatic transmission
subjected to an American driving cycle with the use of a graphic programming language tool called
Simscape Driveline™, in MATLAB®/Simulink® environment. The main model aimed to analyze
the improvements generated in the conflicting fuel consumption x performance tradeoff. A model
with axle ratio 4.0:1 was firstly developed and simulated using the FTP-72 (Federal Test
Procedure) or UDDS (Urban Dynamometer Driving Schedule) driving cycle, where the
commanded speed curves were approximated to the desired speed curves through a controller
subsystem. Through the sweeping of 10 axle ratio values and shift schedule calibration, better fuel
consumption and acceleration time results were successfully reached. Furthermore, a comparative
analysis of the energy for the FTP-72 driving cycle required by the internal combustion engines
and motors, with or without regeneration system, was done as well as the calculation of CO2
emissions in kilograms per driving cycle.

Fire Resistance Composite Tube Mechanical Characterization_ Bachelor Thesis in Portuguese

The present study, which was documented in this paper, sought to develop a device for conducting ... more The present study, which was documented in this paper, sought to develop a device for conducting a biaxial traction test using the solutions presented in the literature. Initially conducted a study that was condensed into an information frame and subsequently extracted the data that served as the basis for the project. Applying the design methodology and analyzing the initial data, a device to be coupled to a conventional traction machine was chosen due to its ease of application. Following
the methodology, had the stage of informational design, conceptual design, preliminary design, detailed design, fabrication and testing. The prototype test was performed with a cross-shaped test piece according to ISO 16842: 2014. It is possible to develop a biaxial test device based on the mechanism presented by Rohr, Harwick and Nahme to be coupled to a universal traction test machine and using a cruciform test body.

This study aimed to develop and apply a method to acquire the values of the developed mechanical ... more This study aimed to develop and apply a method to acquire the values of the developed mechanical stress on the steering system of a BAJA SAE prototype vehicle. For its development, tests were made on the 2012 Parahybaja Team prototype. The prototype have been representing the Federal University of Campina Grande in competitions organized by SAE Brazil between 2012 and 2014. The objective of this work is to obtain values of the mechanical forces, which are transmitted to the tie rod of the steering assembly, using strain gauges for measurement of strain on the part. The motivation for the development of this work is the needing of improvements in the steering system knowing the extreme force values that acts on it. The used methodology has started with the analysis of the possibilities of obtaining the desired data, followed by the selection of the strain gage sensors and its data logger. The needed tools and materials have been purchased, the sensors bonded on the part surface and the system calibrated. Then, the system was assembled to the vehicle and the tests were specified. Collecting the values of forces that govern the different kinds of tests for specific situations was the result of this study and it can conclude that its objectives were achieved as the found input data will help the design of a new steering system for the Parahybaja Team.

Development of a fixture for Edge impact to composite laminates_ Bachelor thesis in Portuguese

Development of a fixture fortensile testing of aramid yarns byReverse Engineering __ Bachelor th... more Development of a fixture fortensile testing of aramid yarns byReverse Engineering __ Bachelor thesis in Portuguese

Developing and Testing a fixture to fatigue radial compression for stent using a DMA Equipment_B... more Developing and Testing a fixture to fatigue radial compression for stent using a DMA Equipment_Bachelor thesis in Portuguese

Polymer composites in general have a high mechanical strength relative to their density. A featur... more Polymer composites in general have a high mechanical strength relative to their density. A feature displayed by the materials so that they can be used for engineering purposes is behavior predictability with respect to load. Due to the heterogeneous nature of the structure of composites and to the interaction between their constituent phases the property of these materials depend on the properties of their constituent phases, their volume fraction, phase interaction and manufacturing method. This work deals with the development of claws for mechanical testing for composite materials, to obtain the interlaminar shear value of polymer composites. The interlaminar shear allows for the evaluation of the influence of the manufacturing method on the composite’s strength. Two types of jaws have been developed: the Iosipescu type and the V-notched Rail Shear type. The following methodology was used: Informational Design, Conceptual Design, Preliminary Design, Detailed Design, Manufacturing and Testing as well as the assembly of an instrumentation system for evaluating the deformation at the center of the specimens. Results obtained with the Iosipescu claw varied 13,6% with those reposted in the literature while those obtained with the Vnotched rail Shear claw showed a 3,9% variation with respect to the literature.

The main objective of this dissertation for the devices that can be used for mode-I and mode-II i... more The main objective of this dissertation for the devices that can be used for mode-I and mode-II interlaminar fracture test in dissimilar materials. For the development of devices for design methodology that projects in informational design, conceptual design, preliminary design, detailed design, fabrication and testing. The choice of the tests that can be used to obtain such fracture modes was made based on the study of academic papers, which pointed to the double beam cantilever (DCB) test, as being the most used for the study of interlaminar mode-I, and end-loaded split (ELS) for the study of mode-II interlaminar fracture. The developed devices were tested in a weight drop impact machine, where aluminum / epoxy adhesive joints were used. Testing and analysis of the behavior of the devices and test bodies were carried out during and after the test.

The objective of this work was the development of thick composite plate for structural and ballis... more The objective of this work was the development of thick composite plate for structural and ballistic applications using the RTM process. The following methodology
was adopted: development of the RTM process for large thickness, ballistic tests, microstructural and mechanical properties characterization of the composite materials
processed. The materials used in the experiments were: fiber glass fabric (1100 g/m2) and vinylester resin DERAKANE 411-350 with Butanox initiator and CoNaP accelerator.
The preforms had 22 to 40 fiber glass reinforcement layers. An experimental RTM setup was proposed and installed. It was possible to process a 25,4 mm thick composite
plate with 32 high density fiber fabric layers (1100 g/m2) and a relatively high viscosity resin system for RTM, making use only of vacuum pressure. By the experiments, we could conclude that the resin injection system and the variation of the amount of resin modified the fulfilling time of the preform and prevented the fulfilling of the preform in the experiments. It was not possible to prevent the phenomenon of race-tracking. The resin injection system and the variation of the amount of resin in the reservoir of injection influence the RTM process. It was only possible to process 28, 30 and 32 composite fiber
layers. The fibre volume fraction of the composite manufactured by RTM controls the mold filling time and composite porosity. The composite with 30 layers presented less porosity, no variation in Interlaminar Shear Strength and lower filling time than the preform with 32 layers and greater filling time than the preform with 28 layers.

CONCEPTUAL DESIGN OF UAV FLYING WING FOR CONSTRUCTION IN 3D PRINTER, 2019

Observation UAVs are unmanned aircraft used for visual reconnaissance of remote or tactical areas... more Observation UAVs are unmanned aircraft used for visual reconnaissance of remote or tactical areas, widely used in safety and some industrial and civil applications. The genesis of this work is the conceptual design of a small UAV using the alternative method of 3D printer construction. The methodology proposed for this work seeks to divide the problem into five phases, from the collection of information about the problem through concepts elaborations to the mathematical and computational analysis steps together with a final stage of fabrication and testing. For the present work, the preliminary phase made intensive use of software such as Autodesk Inventor for drawing and static simulation and CFD analysis software, STAR-CCM + in addition to analytical methods. The final result presented an aircraft configuration with mass and wingspan that meet the proposed specifications. Afterwards, a model of aerodynamic tests made in "Depron" material was carried out, which presented aerodynamic characteristics similar to those foreseen in the Preliminary stage, in terms of the propulsion system's propulsion and response capacity, but still requiring some adjustments to improve stability. A 1:2 scaled model was built on the Object350 Connex 3D printer for structural strength analysis. The alternative manufacturing method, in 3D printer, proved to be feasible from a structural and aerodynamic point of view since the resistance to mass ratio can be compared to conventional manufacturing methods.

From time to time, bomb squads face occasions where one cannot determine the nature of a suspect ... more From time to time, bomb squads face occasions where one cannot determine the nature of a suspect device, being more prudent its neutralization. One of the most efficient techniques employed in these cases is to use a Water Disruptors. It shoots a jet of water at speeds that can reach more than 1000 m/s and destroys the trigger mechanism before it can detonate the explosive. The purpose of this work is to develop a prototype of a Water Disruptor so that it can be used by the Military Police to disarm explosive devices. A design methodology was adopted and a wide database was assembled. Two prototypes were manufactured and field tests were conducted with the support of Military Special Forces. The prototype developed was capable of disabling a fake bomb by shooting 65 mL of water from a distance of 25 mm to the target and using a propellant charge of PETN. A small recoil of 110 mm was produced.

The Dragão do Mar project is the development of a submarine robot type ROV (Remotely Operated Veh... more The Dragão do Mar project is the development of a submarine robot type ROV
(Remotely Operated Vehicle) with subsystems and critical components, providing laboratory
training in the Northeast for the development of subsea technology for water depths of 3000
meters deep. From the need to simulate extreme pressure conditions to study the behavior of
mechanical systems, this paper presents the development of the components of a hyperbaric
chamber, through the analytical verification of the acting tensions, establishment of safety
factors and design the test specimens. It was possible to develop a hyperbaric chamber with
an internal volume of 10 liters within the standards requirements in international standards
and establish a working pressure of 3 MPa with the possibility of increase up to 5 MPa.
Pressure collapse of the cylindrical test specimens made of carbon steel was 2 MPa resulting
in a difference of 5% of the analytical value.