Rafał Molak - Academia.edu (original) (raw)

Papers by Rafał Molak

Materials

Aluminium (Al) and titanium (Ti) coatings were applied on AZ91E magnesium alloy using a low-press... more Aluminium (Al) and titanium (Ti) coatings were applied on AZ91E magnesium alloy using a low-pressure warm spray (WS) method. The deposition was completed using three different nitrogen flow rates (NFR) for both coatings. NFR effects on coating microstructure and other physical properties were systematically studied. Microstructural characterization was performed using scanning electron microscopy (SEM), and the porosity was estimated using two methods—image analysis and X-ray microtomography. The coating adhesion strength, wear resistance, and hardness were examined. The protective properties of the coatings were verified via a salt spray test. Decreasing NFR during coating deposition produced more dense and compact coatings. However, these conditions increased the oxidation of the powder. Al coatings showed lower hardness and wear resistance than Ti coatings, although they are more suitable for corrosion protection due to their low porosity and high compactness.

Journal of KONES, 2018

Remarkable characteristics of high temperature thermoplastic (HTP) matrix used in composite mater... more Remarkable characteristics of high temperature thermoplastic (HTP) matrix used in composite materials reinforced with continuous fibres causes growing application in composite industry. Because of high processing temperature of some semi, crystalline matrix there is limited number of technologies that can be used for part manufacturing. Press forming is an example of technology that allows manufacturing high quality complex parts made of HTP reinforced fibres composite. In order to manufacture part with acceptable quality and mechanical properties, uniform pressure distribution during the process is required. In this article, tooling design process focused on uniform pressure distribution for manufacturing of supporting rib was presented. In order to satisfy this requirement, the rubber stamp was proposed as a tool for manufacturing. Typical press forming process defects were identified and the requirements for rubber stamp were described. It was assumed that the forming process has...

Materials

Designers’ efforts to use the lightest possible materials with very good mechanical properties me... more Designers’ efforts to use the lightest possible materials with very good mechanical properties mean that in recent years magnesium alloys have been increasingly used. It is well-known that the use of various plastic working processes allows achieving even better strength properties of the material, often without significant loss of plastic properties in relation to the properties of products obtained in the casting process. The article presents the results of research on microstructural changes and mechanical properties of the alloy AZ91 (MgAl9Zn1) occurring in samples subjected to conventional plastic deformation and the KOBO method. The obtained results were compared to the properties of reference samples, i.e., cast samples. The article presents the advantage of using the low-temperature KOBO method compared to the high-temperature deformation in a conventional manner. Moreover, it has been shown that the use of KOBO extrusion allows the alloy AZ91 (MgAl9Zn1) to obtain superplast...

Materials

In this research, the cold spray process as an additive manufacturing method was applied to depos... more In this research, the cold spray process as an additive manufacturing method was applied to deposit thick titanium coatings onto 7075 aluminium alloy. An analysis of changes in the microstructure and mechanical properties of the coatings depending on the standoff distance was carried out to obtain the maximum deposition efficiency. The process parameters were selected in such a way as to ensure the spraying of irregular titanium powder at the highest velocity and temperature and changing the standoff distance from 20 to 100 mm. Experimental studies demonstrated that the standoff distance had a significant effect on the microstructure of the coatings and their adhesion. Moreover, its rise significantly increased the deposition efficiency. The standoff distance also significantly affected the coating microstructure and their adhesion to the substrate, but did not cause any changes in their phase composition. The standoff distance also influenced the coating porosity, which first decre...

Materials Science and Engineering: A

Abstract Microstructure, mechanical properties and electrical conductivity of the CuCr0.6 alloy p... more Abstract Microstructure, mechanical properties and electrical conductivity of the CuCr0.6 alloy processed by compression with oscillatory torsion (COT) at room temperature were investigated. The COT processing was applied for the samples processed with the solution treatment followed by quenching into iced water at 1000 °C for 3 h and for the samples processed using the solution treatment followed by aging treatment at 500 °C for 2 h. Application of the solution and aging processes prior to the COT deformation results in the partial dissolution of Cr precipitates into the Cu matrix and precipitation of the coherent second phase precipitates, respectively. COT processing with different values of the total effective strain (eft) of 10, 20, 40 was introduced to the material. It was found that the presence of the second phase precipitates has a significant effect on the formation of the ultrafine grain (UFG) structure during the COT deformation. After the COT deformation with maximal effective strain value of eft = 40 of the samples processed by aging, the obtained grain size was about 300 nm and the high angle boundary fraction of about 30%. Application of the COT deformation at the effective strain value of eft = 40 for the samples after solid-solution treatment leads to the formation of a UFG microstructure with the average grain size of about 450 nm and the high angle boundary fraction of 13%. Formation of the more refined UFG structure and the presence the dispersed chromium precipitates in the samples after aging contributes to the enhanced ultimate tensile strength (UTS) of 521 MPa, with the electrical conductivity of 85% IACS, which are much higher than the corresponding values of solid-solution-treated samples prior to COT of 353 MPa and 40% IACS.

CORROSION

The corrosion resistance of aluminum coatings on Mg alloy (AZ91E) substrate was investigated in 3... more The corrosion resistance of aluminum coatings on Mg alloy (AZ91E) substrate was investigated in 3.5% NaCl solution. The Al coatings were deposited using a warm spraying (WS) method under three diff...

Chinese Journal of Polymer Science

This work is focused on simulating the rheological effects in polyamide. An experimental study is... more This work is focused on simulating the rheological effects in polyamide. An experimental study is carried out in order to assess such features of polyamide as: the hysteretic behavior, the strain rate dependence, and the stress relaxation. The material response in tension is investigated. Digital images correlation method (DIC) is employed in order to measure the material compressibility. A newly developed constitutive model, which was previously used to simulate the mechanical response of polyethylene subjected to moderate strains and compressive loadings, is applied to capture the large strain, inelastic behavior of polyamide in tension. The gathered experimental data are utilized to determine the values of constitutive constants of viscoelasticity and plasticity, which describe the rheological properties of polyamide. The determined material parameters are included in the text. Different strategies for evaluating the material parameters are discussed. The proposed constitutive equation is implemented into the finite element (FE) system, ABAQUS, by taking advantage of the user subroutine UMAT, which allows to define custom material laws. Some exemplary FE simulations that were used to investigate the performance of the developed subroutine are described.

Archives of Civil and Mechanical Engineering

Abstract This papers deals with the character on low (−180 °C) temperature fracture of iron. Micr... more Abstract This papers deals with the character on low (−180 °C) temperature fracture of iron. Microcrystalline and ultrafine-grained (UFG) iron rods were investigated. To obtain UFG material 20 mm in diameter iron rod was hydrostatically extruded (HE) in two steps: from 20 to 12 mm and from 12 to 8 mm. Because of microstructure anisotropy caused by HE mini-disc and mini-beam samples were cut off from perpendicular and longitudinal cross-section of the rods. Microcrystalline rod fractured in brittle manner at low temperature for both cross-sections, but in UFG iron fracture character depended on grain's shape. For samples were crack propagates parallel to the grain's elongation axis intercrystalline fracture occurred. For mini-beams were crack propagates crosswise to the grain elongation axis transcrystalline fracture occurred and force deflection curve was similar to those obtained for room temperature.

Composites Part B: Engineering, 2017

Abstract Various magnetic inorganic-organic hybrid membranes based on linear or hyperbranched pol... more Abstract Various magnetic inorganic-organic hybrid membranes based on linear or hyperbranched polyimide matrix and magnetic microparticles were prepared and characterized. It was stated that the magnetic membrane's gas transport parameters ( D , P, S and α) were improved with the rise of membrane's saturation magnetization, remanence, magnetic particle content and coercivity, associated with the decrease in magnetic powder particle size. The hybrid membranes had much higher gas permeability and diffusivity, while their permselectivity and solubility coefficient values slightly increased. The mechanical and rheological parameters of the tested membranes were improved by the increase of the magnetic filler addition, decrease of its granulation and selection of appropriate type of polymer matrix. The best resistance to elastic deformation had the hybrid PI membranes with high filler addition and small granulation, while their resistance to viscous flow increased with filler particle size rise. The investigated membranes showed the excellent thermooxidative stability.

Key Engineering Materials, 2013

Miniaturized Disc-Bend Test (MDBT), also called the Small Punch Test (SPT) is used for characteri... more Miniaturized Disc-Bend Test (MDBT), also called the Small Punch Test (SPT) is used for characterizing the mechanical properties of metals, when only a small volume of material is available. This study was dedicated to investigating the mechanical properties of AZ91 magnesium cast alloy. The casts were prepared via gravity sand casting and have sections with different wall thickness. The examined samples were cut out of 30 mm and 10 mm thick walls. The correlation between results obtained from the tensile tests and MDBT was determined.

Solid State Phenomena, 2011

ABSTRACT . In this study, commercial Al was subjected to plastic deformation by multi-axial compr... more ABSTRACT . In this study, commercial Al was subjected to plastic deformation by multi-axial compression. The microstructure and mechanical properties in dependence on effective strain were studied. Aluminum was processed to effective strain f = 9.6. The misorientation distribution and subgrain/grain size were analyzed by using a scanning electron microscopy (SEM) equipment with electron back scattered diffraction (EBSD) facility. The dislocation microstructure was investigated by a scanning transmission electron microscope (STEM). The mechanical properties as: yield strength (YS), ultimate tensile strength (UTS), uniform and total elongation were performed on MTS QTest/10 machine equipped with digital image correlation method (DIC). Deformation of Al by the multi-axial compression leads to grain refinement to ultra-fine grains (UFGs) and improvement in strength properties. Material exhibits the following strength parameters: UTS: 129 MPa, YS: 124 MPa after deformation at f = 9.6. These values are about two times higher compared with initial state.

Intermetallics, 2014

ABSTRACT Warm Spraying is an atmospheric coating process based on high-velocity impact bonding of... more ABSTRACT Warm Spraying is an atmospheric coating process based on high-velocity impact bonding of powder particles. By decreasing the temperature of combustion gas via mixing with nitrogen the oxidation of feedstock powder can be effectively controlled. This is particularly important for Ti-based coating materials, which rapidly oxidize at elevated temperatures. In this study, Ti–Al composite coatings were fabricated by the Warm Spray process using a mixture of titanium and aluminum powders as a feedstock and applying a two-stage heat treatment at 600 and 1000 °C to obtain intermetallic phases. The microstructure, chemical and phase composition of the deposited and heat-treated coatings were investigated using SEM, EDS and XRD. The experimental results show that TiAl3 was the first intermetallic phase formed during the first-stage heat treatment. The growth of TiAl3 layer occurred mainly by diffusion of Al into Ti particles. Significant porosity that developed during the heat treatment was caused mainly by Kirkendall effect. After the second-stage heat treatment, a coating layer with TiAl as the dominant phase was obtained with about 20 vol % porosity.

Computational Materials Science, 2012

ABSTRACT The aim of presented investigations was to perform uniaxial tensile tests of flat specim... more ABSTRACT The aim of presented investigations was to perform uniaxial tensile tests of flat specimens made of carbon fiber reinforced composites with strain measurements performed by means of Digital Image Correlation (DIC) method. Samples with three reinforcement types were examined. DIC method was used in two point tracing mode (optical extensometer) for longitudinal and transversal strain measurements. The results of this measurement were used for Young’s modulus and Poisson’s ratio calculations necessary in the designing process of the mobile robot manipulator. Additionally strain fields maps were evaluated for the selected moments of tensile tests. Obtained strain maps showed inhomogeneity of strain distributions and its dependence on the reinforcement fibers types. Strain maps showed also the areas where delamination occurs. Presented methodology may be applied for validation of the results of composite materials deformation modeling.

Journal of Thermal Spray Technology, 2013

Journal of the Brazilian Society of Mechanical Sciences and Engineering

The current study concerns the determination of material constants of a three-dimensional linear ... more The current study concerns the determination of material constants of a three-dimensional linear viscoelastic model. It is assumed that the constitutive equation utilizes a Prony series as a memory function. A method for the evaluation of relaxation function parameters is presented which can be used for arbitrary loading histories. The proposed methodology is applied to the identification of the viscoelastic constants of acrylonitrile butadiene styrene (ABS). For that purpose, a number of rheological tests in tension have been performed on ABS standard dogbone specimens. The significance of the time-dependent Poisson’s ratio for the determination of material parameters is investigated. It is found that taking into account the measurements of specimen’s lateral contraction over time has a particularly strong influence on the identified values of parameters responsible for the bulk behavior. Several boundary value problems have been analyzed in order to assess the influence of the mat...

… Thermal Spray Conference and Exposition (ITSC), 2013

... The Influence of hydrostatic extrusion on microstructure of 6082 aluminum alloy; Combination ... more ... The Influence of hydrostatic extrusion on microstructure of 6082 aluminum alloy; Combination of ECAP and Hydrostatic Extrusion for ... PLASTIC PROPERTIES OF GaN AND Al 2 O 3 CRYSTAL: FEM-SIMULATION OF NANOINDENTATION CONFIRMED BY HIGH-RESOLUTION ...

Materials

Aluminium (Al) and titanium (Ti) coatings were applied on AZ91E magnesium alloy using a low-press... more Aluminium (Al) and titanium (Ti) coatings were applied on AZ91E magnesium alloy using a low-pressure warm spray (WS) method. The deposition was completed using three different nitrogen flow rates (NFR) for both coatings. NFR effects on coating microstructure and other physical properties were systematically studied. Microstructural characterization was performed using scanning electron microscopy (SEM), and the porosity was estimated using two methods—image analysis and X-ray microtomography. The coating adhesion strength, wear resistance, and hardness were examined. The protective properties of the coatings were verified via a salt spray test. Decreasing NFR during coating deposition produced more dense and compact coatings. However, these conditions increased the oxidation of the powder. Al coatings showed lower hardness and wear resistance than Ti coatings, although they are more suitable for corrosion protection due to their low porosity and high compactness.

Journal of KONES, 2018

Remarkable characteristics of high temperature thermoplastic (HTP) matrix used in composite mater... more Remarkable characteristics of high temperature thermoplastic (HTP) matrix used in composite materials reinforced with continuous fibres causes growing application in composite industry. Because of high processing temperature of some semi, crystalline matrix there is limited number of technologies that can be used for part manufacturing. Press forming is an example of technology that allows manufacturing high quality complex parts made of HTP reinforced fibres composite. In order to manufacture part with acceptable quality and mechanical properties, uniform pressure distribution during the process is required. In this article, tooling design process focused on uniform pressure distribution for manufacturing of supporting rib was presented. In order to satisfy this requirement, the rubber stamp was proposed as a tool for manufacturing. Typical press forming process defects were identified and the requirements for rubber stamp were described. It was assumed that the forming process has...

Materials

Designers’ efforts to use the lightest possible materials with very good mechanical properties me... more Designers’ efforts to use the lightest possible materials with very good mechanical properties mean that in recent years magnesium alloys have been increasingly used. It is well-known that the use of various plastic working processes allows achieving even better strength properties of the material, often without significant loss of plastic properties in relation to the properties of products obtained in the casting process. The article presents the results of research on microstructural changes and mechanical properties of the alloy AZ91 (MgAl9Zn1) occurring in samples subjected to conventional plastic deformation and the KOBO method. The obtained results were compared to the properties of reference samples, i.e., cast samples. The article presents the advantage of using the low-temperature KOBO method compared to the high-temperature deformation in a conventional manner. Moreover, it has been shown that the use of KOBO extrusion allows the alloy AZ91 (MgAl9Zn1) to obtain superplast...

Materials

In this research, the cold spray process as an additive manufacturing method was applied to depos... more In this research, the cold spray process as an additive manufacturing method was applied to deposit thick titanium coatings onto 7075 aluminium alloy. An analysis of changes in the microstructure and mechanical properties of the coatings depending on the standoff distance was carried out to obtain the maximum deposition efficiency. The process parameters were selected in such a way as to ensure the spraying of irregular titanium powder at the highest velocity and temperature and changing the standoff distance from 20 to 100 mm. Experimental studies demonstrated that the standoff distance had a significant effect on the microstructure of the coatings and their adhesion. Moreover, its rise significantly increased the deposition efficiency. The standoff distance also significantly affected the coating microstructure and their adhesion to the substrate, but did not cause any changes in their phase composition. The standoff distance also influenced the coating porosity, which first decre...

Materials Science and Engineering: A

Abstract Microstructure, mechanical properties and electrical conductivity of the CuCr0.6 alloy p... more Abstract Microstructure, mechanical properties and electrical conductivity of the CuCr0.6 alloy processed by compression with oscillatory torsion (COT) at room temperature were investigated. The COT processing was applied for the samples processed with the solution treatment followed by quenching into iced water at 1000 °C for 3 h and for the samples processed using the solution treatment followed by aging treatment at 500 °C for 2 h. Application of the solution and aging processes prior to the COT deformation results in the partial dissolution of Cr precipitates into the Cu matrix and precipitation of the coherent second phase precipitates, respectively. COT processing with different values of the total effective strain (eft) of 10, 20, 40 was introduced to the material. It was found that the presence of the second phase precipitates has a significant effect on the formation of the ultrafine grain (UFG) structure during the COT deformation. After the COT deformation with maximal effective strain value of eft = 40 of the samples processed by aging, the obtained grain size was about 300 nm and the high angle boundary fraction of about 30%. Application of the COT deformation at the effective strain value of eft = 40 for the samples after solid-solution treatment leads to the formation of a UFG microstructure with the average grain size of about 450 nm and the high angle boundary fraction of 13%. Formation of the more refined UFG structure and the presence the dispersed chromium precipitates in the samples after aging contributes to the enhanced ultimate tensile strength (UTS) of 521 MPa, with the electrical conductivity of 85% IACS, which are much higher than the corresponding values of solid-solution-treated samples prior to COT of 353 MPa and 40% IACS.

CORROSION

The corrosion resistance of aluminum coatings on Mg alloy (AZ91E) substrate was investigated in 3... more The corrosion resistance of aluminum coatings on Mg alloy (AZ91E) substrate was investigated in 3.5% NaCl solution. The Al coatings were deposited using a warm spraying (WS) method under three diff...

Chinese Journal of Polymer Science

This work is focused on simulating the rheological effects in polyamide. An experimental study is... more This work is focused on simulating the rheological effects in polyamide. An experimental study is carried out in order to assess such features of polyamide as: the hysteretic behavior, the strain rate dependence, and the stress relaxation. The material response in tension is investigated. Digital images correlation method (DIC) is employed in order to measure the material compressibility. A newly developed constitutive model, which was previously used to simulate the mechanical response of polyethylene subjected to moderate strains and compressive loadings, is applied to capture the large strain, inelastic behavior of polyamide in tension. The gathered experimental data are utilized to determine the values of constitutive constants of viscoelasticity and plasticity, which describe the rheological properties of polyamide. The determined material parameters are included in the text. Different strategies for evaluating the material parameters are discussed. The proposed constitutive equation is implemented into the finite element (FE) system, ABAQUS, by taking advantage of the user subroutine UMAT, which allows to define custom material laws. Some exemplary FE simulations that were used to investigate the performance of the developed subroutine are described.

Archives of Civil and Mechanical Engineering

Abstract This papers deals with the character on low (−180 °C) temperature fracture of iron. Micr... more Abstract This papers deals with the character on low (−180 °C) temperature fracture of iron. Microcrystalline and ultrafine-grained (UFG) iron rods were investigated. To obtain UFG material 20 mm in diameter iron rod was hydrostatically extruded (HE) in two steps: from 20 to 12 mm and from 12 to 8 mm. Because of microstructure anisotropy caused by HE mini-disc and mini-beam samples were cut off from perpendicular and longitudinal cross-section of the rods. Microcrystalline rod fractured in brittle manner at low temperature for both cross-sections, but in UFG iron fracture character depended on grain's shape. For samples were crack propagates parallel to the grain's elongation axis intercrystalline fracture occurred. For mini-beams were crack propagates crosswise to the grain elongation axis transcrystalline fracture occurred and force deflection curve was similar to those obtained for room temperature.

Composites Part B: Engineering, 2017

Abstract Various magnetic inorganic-organic hybrid membranes based on linear or hyperbranched pol... more Abstract Various magnetic inorganic-organic hybrid membranes based on linear or hyperbranched polyimide matrix and magnetic microparticles were prepared and characterized. It was stated that the magnetic membrane's gas transport parameters ( D , P, S and α) were improved with the rise of membrane's saturation magnetization, remanence, magnetic particle content and coercivity, associated with the decrease in magnetic powder particle size. The hybrid membranes had much higher gas permeability and diffusivity, while their permselectivity and solubility coefficient values slightly increased. The mechanical and rheological parameters of the tested membranes were improved by the increase of the magnetic filler addition, decrease of its granulation and selection of appropriate type of polymer matrix. The best resistance to elastic deformation had the hybrid PI membranes with high filler addition and small granulation, while their resistance to viscous flow increased with filler particle size rise. The investigated membranes showed the excellent thermooxidative stability.

Key Engineering Materials, 2013

Miniaturized Disc-Bend Test (MDBT), also called the Small Punch Test (SPT) is used for characteri... more Miniaturized Disc-Bend Test (MDBT), also called the Small Punch Test (SPT) is used for characterizing the mechanical properties of metals, when only a small volume of material is available. This study was dedicated to investigating the mechanical properties of AZ91 magnesium cast alloy. The casts were prepared via gravity sand casting and have sections with different wall thickness. The examined samples were cut out of 30 mm and 10 mm thick walls. The correlation between results obtained from the tensile tests and MDBT was determined.

Solid State Phenomena, 2011

ABSTRACT . In this study, commercial Al was subjected to plastic deformation by multi-axial compr... more ABSTRACT . In this study, commercial Al was subjected to plastic deformation by multi-axial compression. The microstructure and mechanical properties in dependence on effective strain were studied. Aluminum was processed to effective strain f = 9.6. The misorientation distribution and subgrain/grain size were analyzed by using a scanning electron microscopy (SEM) equipment with electron back scattered diffraction (EBSD) facility. The dislocation microstructure was investigated by a scanning transmission electron microscope (STEM). The mechanical properties as: yield strength (YS), ultimate tensile strength (UTS), uniform and total elongation were performed on MTS QTest/10 machine equipped with digital image correlation method (DIC). Deformation of Al by the multi-axial compression leads to grain refinement to ultra-fine grains (UFGs) and improvement in strength properties. Material exhibits the following strength parameters: UTS: 129 MPa, YS: 124 MPa after deformation at f = 9.6. These values are about two times higher compared with initial state.

Intermetallics, 2014

ABSTRACT Warm Spraying is an atmospheric coating process based on high-velocity impact bonding of... more ABSTRACT Warm Spraying is an atmospheric coating process based on high-velocity impact bonding of powder particles. By decreasing the temperature of combustion gas via mixing with nitrogen the oxidation of feedstock powder can be effectively controlled. This is particularly important for Ti-based coating materials, which rapidly oxidize at elevated temperatures. In this study, Ti–Al composite coatings were fabricated by the Warm Spray process using a mixture of titanium and aluminum powders as a feedstock and applying a two-stage heat treatment at 600 and 1000 °C to obtain intermetallic phases. The microstructure, chemical and phase composition of the deposited and heat-treated coatings were investigated using SEM, EDS and XRD. The experimental results show that TiAl3 was the first intermetallic phase formed during the first-stage heat treatment. The growth of TiAl3 layer occurred mainly by diffusion of Al into Ti particles. Significant porosity that developed during the heat treatment was caused mainly by Kirkendall effect. After the second-stage heat treatment, a coating layer with TiAl as the dominant phase was obtained with about 20 vol % porosity.

Computational Materials Science, 2012

ABSTRACT The aim of presented investigations was to perform uniaxial tensile tests of flat specim... more ABSTRACT The aim of presented investigations was to perform uniaxial tensile tests of flat specimens made of carbon fiber reinforced composites with strain measurements performed by means of Digital Image Correlation (DIC) method. Samples with three reinforcement types were examined. DIC method was used in two point tracing mode (optical extensometer) for longitudinal and transversal strain measurements. The results of this measurement were used for Young’s modulus and Poisson’s ratio calculations necessary in the designing process of the mobile robot manipulator. Additionally strain fields maps were evaluated for the selected moments of tensile tests. Obtained strain maps showed inhomogeneity of strain distributions and its dependence on the reinforcement fibers types. Strain maps showed also the areas where delamination occurs. Presented methodology may be applied for validation of the results of composite materials deformation modeling.

Journal of Thermal Spray Technology, 2013

Journal of the Brazilian Society of Mechanical Sciences and Engineering

The current study concerns the determination of material constants of a three-dimensional linear ... more The current study concerns the determination of material constants of a three-dimensional linear viscoelastic model. It is assumed that the constitutive equation utilizes a Prony series as a memory function. A method for the evaluation of relaxation function parameters is presented which can be used for arbitrary loading histories. The proposed methodology is applied to the identification of the viscoelastic constants of acrylonitrile butadiene styrene (ABS). For that purpose, a number of rheological tests in tension have been performed on ABS standard dogbone specimens. The significance of the time-dependent Poisson’s ratio for the determination of material parameters is investigated. It is found that taking into account the measurements of specimen’s lateral contraction over time has a particularly strong influence on the identified values of parameters responsible for the bulk behavior. Several boundary value problems have been analyzed in order to assess the influence of the mat...

… Thermal Spray Conference and Exposition (ITSC), 2013

... The Influence of hydrostatic extrusion on microstructure of 6082 aluminum alloy; Combination ... more ... The Influence of hydrostatic extrusion on microstructure of 6082 aluminum alloy; Combination of ECAP and Hydrostatic Extrusion for ... PLASTIC PROPERTIES OF GaN AND Al 2 O 3 CRYSTAL: FEM-SIMULATION OF NANOINDENTATION CONFIRMED BY HIGH-RESOLUTION ...