Investigation on the Thermoforming of Pmsq-Hdpe for the Manufacture of a NACA Profile of Small Dimensions (original) (raw)
Related papers
2021
Lightweight and high strength composite materials are vital for unmanned aerial vehicles (UAVs) and aerospace technologies with desired characteristics. Carbon composite materials exhibit extraordinary properties for UAVs and aerospace applications. This study aimed to discover the best-prepared composition of composites material having epoxy LY-5052 and carbon fibres laminate for UAVs. Besides, to develop a low cost with high specific strength composite material for aerospace application to replace metallic alloys. In this work, the vacuum bag technique is used to prepare rectangular strips of three different ratios of carbon fibre/epoxy laminates [(40:60), (50:50) and (60:40)] to obtain the best composite in terms of properties. The thermo-mechanical and viscoelastic behaviour of composite materials were evaluated using differential scanning calorimetry (DSC), universal testing machine (UTM) and dynamic mechanical analysis (DMA). The tensile strength of epoxy LY5052 composites wit...
Analysis of the High Strain-Rate Behaviour of Polyethylene Based Nanocomposites
2011
Advanced polymeric materials and polymer based nanocomposites are finding an increasing range of industrial and defence applications. These materials have the potential to improve combat survivability, whilst reducing cost and weight. This study deals with nanocomposites manufactured from blends of low density polyethylene (LDPE) with various nanofillers. The high strain rate behaviour of these materials was investigated using the split Hopkinson pressure bar (SHPB) test. The experimental results for non-reinforced materials were used as a reference to analyse the effect of the nanofillers on the properties and performance of the nanocomposites. These results, together with those obtained from other mechanical tests, will be used as input into finite-element analyses to simulate the performance of these materials in lightweight armour applications. In the first step, the finite element model was validated by simulating the SHPB test and comparing the predicted results with those from the experiments. Explicit finite element analysis was used for the simulation. The fully developed model was able to demonstrate the behaviour of the test bar and specimen interaction correctly and reasonably good agreement between predicted and experimental results was observed.
Journal of Polymer Research, 2012
High density polyethylene was melt compounded with various untreated (hydrophilic) or surface treated (hydrophobic) fumed silica nanoparticles, having different surface areas. The thermo-mechanical properties of the resulting nanocomposites have been thoroughly investigated. Field emission scanning electron microscopy revealed that nanofiller aggregation was more pronounced as the silica surface area increased, while nanofiller dispersion improved with a proper filler functionalization. The homogeneous distribution of fumed silica aggregates at low filler content allowed us to reach remarkable improvements of thermal stability, evidenced by an increase of the degradation temperature and a decrease of the mass loss rate with respect to neat matrix, especially when surface treated nanoparticles were utilized. Interestingly, the stabilizing effect produced by fumed silica nanoparticles was accompanied by noticeable enhancements of the ultimate tensile mechanical properties, both under quasi-static and impact conditions. Concurrently, a progressive enhancement of both elastic modulus and tensile stress at yield with the filler amount, was observed.
The Use of Polymer Nanocomposites in the Aerospace and the Military/Defence Industries
Polymer Nanocomposites for Advanced Engineering and Military Applications
Previously, applications of composites were limited to the military aerospace. This is because civilian aircraft with composites inclusions was considered to be too expensive. The use of composite in aircrafts, instead of steel, has resulted in lightweight aircraft structures and has consequently reduced the level of fuel consumption and costs of fuel, thereby reducing CO2 emissions. Undoubtedly, nanocomposites applications abound in several aspects of human life and the use of nanoparticle in materials dates back to the understanding of the nature of these materials. This chapter will focus on the use of nanopolymers in the aerospace and in the military. Particular attention will be given to nano military weapons, nanocoating for military applications, nanotechnology for military drones, nanotechnology in military suits, gloves, boots and nanotechnology in armored military vehicles, aircraft, and military ships and in military medicine.
Polymer Nanocomposites for Advanced Engineering and Military Applications
Previously, applications of composites were limited to the military aerospace. This is because civilian aircraft with composites inclusions was considered to be too expensive. The use of composite in aircrafts, instead of steel, has resulted in lightweight aircraft structures and has consequently reduced the level of fuel consumption and costs of fuel, thereby reducing CO 2 emissions. Undoubtedly, nanocomposites applications abound in several aspects of human life and the use of nanoparticle in materials dates back to the understanding of the nature of these materials. This chapter will focus on the use of nanopolymers in the aerospace and in the military. Particular attention will be given to nano military weapons, nanocoating for military applications, nanotechnology for military drones, nanotechnology in military suits, gloves, boots and nanotechnology in armored military vehicles, aircraft, and military ships and in military medicine.
STUDY OF MECHANICAL BEHAVIOUR OF THERMOPLASTIC POLYMER NANOCOMPOSITES
Polymers are widely used advanced materials which find their application in almost all walks of life. The expansion of lightweight automotive parts is an important issue for improving the efficiency of vehicles. polymer composites have been widely applied to reduce weight and heighten the mechanical properties. The current work involves Polypropylene (PP) as matrix material and Multiwalled Carbon Nanotubes (MWCNTs) as reinforcements. This paper concentrates on the variation of different mechanical properties of the PP+MWCNT composites, against the change in reinforcement percentage. Composite pellets were prepared by using twin screw extruder followed by injection moulding according to ASTM standards for the specimen preparation. The tensile tests were conducted on the composite specimens using computerized UTM at the parameters specified in ASTM D638. The experimental results showed that with the increasing amount of MWCNT the elongation at break decreased by 67.01% whereas the Youngs Modulus increased by 65.8%. The tensile test results were analyzed by using different plots which are detailed in the relevant sections. The developed optimized composite can be widely used in applications involving light and strong materials with improved mechanical properties.
International Journal for Research in Applied Science and Engineering Technology (IJRASET), 2022
For the creation of composite materials based on high density polyethylene, silica nanoparticles are utilised as fillers. Due to their low cost, high aspect ratio, and rather acceptable mechanical qualities, silica nanoparticles are recommended for reinforcement of high density polyethylene and may be found in a variety of sources. Compression moulding and a stirrer were used to prepare the composite. Tensile and Impact tests are used to examine the composite's mechanical characteristics. Thermo-Gravimetric Analysis (TGA) and Differential Scanning Calorimetry are used to assess the composite's thermal characteristics (DSC). The results of the composite's testing show that adding silica nanoparticle reinforcement has enhanced the mechanical and thermal characteristics of the HDPE composite.
Polymer Nanocomposites for Aerospace Applications: Properties
Advanced Engineering Materials, 2003
Polymer nanocomposites may provide significantly increased modulus, gas barrier, thermal performance, atomic oxygen resistance, resistance to small molecule permeation and improved ablative performance when compared to typical traditional carbon-fiber-reinforced polymeric composites. This presentation gives a review on both theoretical and experimental investigations extracting valuable fundamental elements including field emission, thermal stability, and electrical, optical and mechanical properties of polymer nanocomposites for aerospace applicability.
Thermal stability of high density polyethylene–fumed silica nanocomposites
Journal of Thermal Analysis and Calorimetry, 2012
In this work, the effect of fumed silica on the long-term resistance of high-density polyethylene was investigated. Different amounts of functionalized fumed silica nanoparticles were dispersed in a high-density polyethylene matrix by melt compounding, and compression molded specimens were tested under tensile mode in the quasi-static ramp and creep conditions. In particular, tensile tests at different speeds and temperatures and the subsequent application of the modified Ree-Eyring model allowed the determination of an analytical expression correlating the strain rate with the yield stress and the testing temperature. It was demonstrated that the introduction of fumed silica led to a significant drop in the deformation rate, especially at elevated filler amounts. Creep tests showed that the nanofiller addition led to a progressive reduction of the critical deformation values. The application of this engineering approach evidenced how nanosilica introduction led to a systematic increase of the time-to-failure values, and good accordance between theoretical prediction and experimental measurements was found.