E. Emelianova, V. Romanova, E. Dymnich, M. Pisarev
The effect of a textured surface layer on the deformation behavior of surface-modified titanium is numerically investigated. A three-dimensional polycrystalline model accounting for the grain morphology was generated by a step-by-step packing method. A crystal plasticity-based constitutive model describing the anisotropic elastic-plastic behavior of individual grains is implemented in a dynamic boundary-value problem that is numerically solved using ABAQUS/Explicit finite element package. Two sets of calculations for polycrystalline models with textured and untextured surface layers were performed. Conclusions on the surface texture effect on the stress and strain fields and surface roughening in the surface and in the bulk of the polycrystals were drawn.The effect of a textured surface layer on the deformation behavior of surface-modified titanium is numerically investigated. A three-dimensional polycrystalline model accounting for the grain morphology was generated by a step-by-step packing method. A crystal plasticity-based constitutive model describing the anisotropic elastic-plastic behavior of individual grains is implemented in a dynamic boundary-value problem that is numerically solved using ABAQUS/Explicit finite element package. Two sets of calculations for polycrystalline models with textured and untextured surface layers were performed. Conclusions on the surface texture effect on the stress and strain fields and surface roughening in the surface and in the bulk of the polycrystals were drawn.
{"title":"The effect of a textured surface layer on the deformation behavior of polycrystalline titanium","authors":"E. Emelianova, V. Romanova, E. Dymnich, M. Pisarev","doi":"10.1063/1.5131948","DOIUrl":"https://doi.org/10.1063/1.5131948","url":null,"abstract":"The effect of a textured surface layer on the deformation behavior of surface-modified titanium is numerically investigated. A three-dimensional polycrystalline model accounting for the grain morphology was generated by a step-by-step packing method. A crystal plasticity-based constitutive model describing the anisotropic elastic-plastic behavior of individual grains is implemented in a dynamic boundary-value problem that is numerically solved using ABAQUS/Explicit finite element package. Two sets of calculations for polycrystalline models with textured and untextured surface layers were performed. Conclusions on the surface texture effect on the stress and strain fields and surface roughening in the surface and in the bulk of the polycrystals were drawn.The effect of a textured surface layer on the deformation behavior of surface-modified titanium is numerically investigated. A three-dimensional polycrystalline model accounting for the grain morphology was generated by a step-by-step packing method. A crystal plasticity-based constitutive model describing the anisotropic elastic-plastic behavior of individual grains is implemented in a dynamic boundary-value problem that is numerically solved using ABAQUS/Explicit finite element package. Two sets of calculations for polycrystalline models with textured and untextured surface layers were performed. Conclusions on the surface texture effect on the stress and strain fields and surface roughening in the surface and in the bulk of the polycrystals were drawn.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84408316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Petrov, E. Y. Kovalenko, T. Sagachenko, R. S. Min, Y. Patrakov
A complex of methods of investigation (elemental analysis, cryoscopy in benzene, IR and NMR spectroscopy) is used to characterize the liquid products of thermal degradation of combustible shale samples in benzene under supercritical conditions. The samples differ in the type of the original OM. It is found out that pyrolysates withdrawn in the temperature ranges up to 200, 200–300, 300–400, 400–480°C differ in their molecular mass, content of resin-asphaltene components and heteroatoms, and the H/C atomic ratio. It is shown that pyrolysates obtained from OM of the type II have higher average molecular masses, lower concentrations of heteroatoms, and contain more of oil components than pyrolysates obtained from OM of the type I. The results of the study are important for the choice of methods for processing combustible shale, purposing to obtain chemically useful components based on them.A complex of methods of investigation (elemental analysis, cryoscopy in benzene, IR and NMR spectroscopy) is used to characterize the liquid products of thermal degradation of combustible shale samples in benzene under supercritical conditions. The samples differ in the type of the original OM. It is found out that pyrolysates withdrawn in the temperature ranges up to 200, 200–300, 300–400, 400–480°C differ in their molecular mass, content of resin-asphaltene components and heteroatoms, and the H/C atomic ratio. It is shown that pyrolysates obtained from OM of the type II have higher average molecular masses, lower concentrations of heteroatoms, and contain more of oil components than pyrolysates obtained from OM of the type I. The results of the study are important for the choice of methods for processing combustible shale, purposing to obtain chemically useful components based on them.
{"title":"Characteristics of products of thermal conversion of oil shales in supercritical benzene","authors":"A. Petrov, E. Y. Kovalenko, T. Sagachenko, R. S. Min, Y. Patrakov","doi":"10.1063/1.5132141","DOIUrl":"https://doi.org/10.1063/1.5132141","url":null,"abstract":"A complex of methods of investigation (elemental analysis, cryoscopy in benzene, IR and NMR spectroscopy) is used to characterize the liquid products of thermal degradation of combustible shale samples in benzene under supercritical conditions. The samples differ in the type of the original OM. It is found out that pyrolysates withdrawn in the temperature ranges up to 200, 200–300, 300–400, 400–480°C differ in their molecular mass, content of resin-asphaltene components and heteroatoms, and the H/C atomic ratio. It is shown that pyrolysates obtained from OM of the type II have higher average molecular masses, lower concentrations of heteroatoms, and contain more of oil components than pyrolysates obtained from OM of the type I. The results of the study are important for the choice of methods for processing combustible shale, purposing to obtain chemically useful components based on them.A complex of methods of investigation (elemental analysis, cryoscopy in benzene, IR and NMR spectroscopy) is used to characterize the liquid products of thermal degradation of combustible shale samples in benzene under supercritical conditions. The samples differ in the type of the original OM. It is found out that pyrolysates withdrawn in the temperature ranges up to 200, 200–300, 300–400, 400–480°C differ in their molecular mass, content of resin-asphaltene components and heteroatoms, and the H/C atomic ratio. It is shown that pyrolysates obtained from OM of the type II have higher average molecular masses, lower concentrations of heteroatoms, and contain more of oil components than pyrolysates obtained from OM of the type I. The results of the study are important for the choice of methods for processing combustible shale, purposing to obtain chemically useful components based on them.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88101504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The plane vector field for solid with constant deformation is considered. The formulae for components of the field are given. Linear character of a displacement fields and its evolution is shown at the example of plastic flow of base metal of welded joint in the neck region. Two consequent vector fields give the summary field as their sum. The high-cyclic fatigue of welded joints of Fe-17Cr-0.8Ti-0.08C steel was used to analyze. The criteria of deviation the vector field from the field, which components can be described by analytical functions, are considered. It is shown that summary declination of these criteria from the Cauchy–Riemann equations is closed to deformation. Therefore, only non-linear components of the deformation can satisfied to Cauchy–Riemann equations for the next conformal transformation.The plane vector field for solid with constant deformation is considered. The formulae for components of the field are given. Linear character of a displacement fields and its evolution is shown at the example of plastic flow of base metal of welded joint in the neck region. Two consequent vector fields give the summary field as their sum. The high-cyclic fatigue of welded joints of Fe-17Cr-0.8Ti-0.08C steel was used to analyze. The criteria of deviation the vector field from the field, which components can be described by analytical functions, are considered. It is shown that summary declination of these criteria from the Cauchy–Riemann equations is closed to deformation. Therefore, only non-linear components of the deformation can satisfied to Cauchy–Riemann equations for the next conformal transformation.
{"title":"Deformation as a measure of conformality deviation","authors":"V. Kibitkin","doi":"10.1063/1.5132024","DOIUrl":"https://doi.org/10.1063/1.5132024","url":null,"abstract":"The plane vector field for solid with constant deformation is considered. The formulae for components of the field are given. Linear character of a displacement fields and its evolution is shown at the example of plastic flow of base metal of welded joint in the neck region. Two consequent vector fields give the summary field as their sum. The high-cyclic fatigue of welded joints of Fe-17Cr-0.8Ti-0.08C steel was used to analyze. The criteria of deviation the vector field from the field, which components can be described by analytical functions, are considered. It is shown that summary declination of these criteria from the Cauchy–Riemann equations is closed to deformation. Therefore, only non-linear components of the deformation can satisfied to Cauchy–Riemann equations for the next conformal transformation.The plane vector field for solid with constant deformation is considered. The formulae for components of the field are given. Linear character of a displacement fields and its evolution is shown at the example of plastic flow of base metal of welded joint in the neck region. Two consequent vector fields give the summary field as their sum. The high-cyclic fatigue of welded joints of Fe-17Cr-0.8Ti-0.08C steel was used to analyze. The criteria of deviation the vector field from the field, which components can be described by analytical functions, are considered. It is shown that summary declination of these criteria from the Cauchy–Riemann equations is closed to deformation. Therefore, only non-linear components of the deformation can satisfied to Cauchy–Riemann equations for the next conformal transformation.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86753501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. Toropkov, E. Glazkova, N. Rodkevich, A. Pervikov, M. Lerner
Metal powder composites for powder injection molding (PIM) technology have been studied. Stainless steel 316L bimodal powders consisting of both nano and microparticles and multicomponent binders based on PLA/PMMA (feedstock I), paraffin wax/PE-LD/PMMA (feedstock II) and polyethylene wax (feedstock III) were used to obtain feedstock. The effect of the binder composition on the characteristics of feedstocks and sintered compacts was investigated. The use of PMMA in a binder allows maintaining the strength of the compacts to high temperatures when sintering. The debinding of “green compacts” from feedstock III leads to an almost complete removal of paraffin wax, and the “brown” parts retain their shape only due to the low-temperature sintering of nanoparticles. The use of the paraffin wax as a binder requires an increase in the content of the bimodal metal powder in the feedstock to 95 wt% to increase the strength of the compacts. Feedstocks and molded compacts were characterized by TEM, SEM, DSC-TG methods.Metal powder composites for powder injection molding (PIM) technology have been studied. Stainless steel 316L bimodal powders consisting of both nano and microparticles and multicomponent binders based on PLA/PMMA (feedstock I), paraffin wax/PE-LD/PMMA (feedstock II) and polyethylene wax (feedstock III) were used to obtain feedstock. The effect of the binder composition on the characteristics of feedstocks and sintered compacts was investigated. The use of PMMA in a binder allows maintaining the strength of the compacts to high temperatures when sintering. The debinding of “green compacts” from feedstock III leads to an almost complete removal of paraffin wax, and the “brown” parts retain their shape only due to the low-temperature sintering of nanoparticles. The use of the paraffin wax as a binder requires an increase in the content of the bimodal metal powder in the feedstock to 95 wt% to increase the strength of the compacts. Feedstocks and molded compacts were characterized by TEM, SEM, DSC-TG methods.
{"title":"Effect of binder composition on properties of 316L stainless steel bimodal powder feedstock","authors":"N. Toropkov, E. Glazkova, N. Rodkevich, A. Pervikov, M. Lerner","doi":"10.1063/1.5132232","DOIUrl":"https://doi.org/10.1063/1.5132232","url":null,"abstract":"Metal powder composites for powder injection molding (PIM) technology have been studied. Stainless steel 316L bimodal powders consisting of both nano and microparticles and multicomponent binders based on PLA/PMMA (feedstock I), paraffin wax/PE-LD/PMMA (feedstock II) and polyethylene wax (feedstock III) were used to obtain feedstock. The effect of the binder composition on the characteristics of feedstocks and sintered compacts was investigated. The use of PMMA in a binder allows maintaining the strength of the compacts to high temperatures when sintering. The debinding of “green compacts” from feedstock III leads to an almost complete removal of paraffin wax, and the “brown” parts retain their shape only due to the low-temperature sintering of nanoparticles. The use of the paraffin wax as a binder requires an increase in the content of the bimodal metal powder in the feedstock to 95 wt% to increase the strength of the compacts. Feedstocks and molded compacts were characterized by TEM, SEM, DSC-TG methods.Metal powder composites for powder injection molding (PIM) technology have been studied. Stainless steel 316L bimodal powders consisting of both nano and microparticles and multicomponent binders based on PLA/PMMA (feedstock I), paraffin wax/PE-LD/PMMA (feedstock II) and polyethylene wax (feedstock III) were used to obtain feedstock. The effect of the binder composition on the characteristics of feedstocks and sintered compacts was investigated. The use of PMMA in a binder allows maintaining the strength of the compacts to high temperatures when sintering. The debinding of “green compacts” from feedstock III leads to an almost complete removal of paraffin wax, and the “brown” parts retain their shape only due to the low-temperature sintering of nanoparticles. The use of the paraffin wax as a binder requires an increase in the content of the bimodal metal powder in the feedstock to 95 wt% to increase the strength of the compacts. Feedstocks and molded compacts were characterized by TEM, SEM, DSC-TG methods.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79666577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Astafurov, G. Maier, I. Tumbusova, E. Melnikov, V. Moskvina, M. Panchenko, N. Galchenko, E. Astafurova
Using different solid solution treatments, two structural states were produced in high-interstitial austenitic Fe-19Cr-22Mn-1.6V-0.4C-0.8N and Fe-22Cr-26Mn-1.3V-0.7C-1.2N (all in wt %) steels. Room...
{"title":"The effect of solid-solution temperature on phase composition and tensile properties of vanadium-alloyed high interstitial steels","authors":"S. Astafurov, G. Maier, I. Tumbusova, E. Melnikov, V. Moskvina, M. Panchenko, N. Galchenko, E. Astafurova","doi":"10.1063/1.5131888","DOIUrl":"https://doi.org/10.1063/1.5131888","url":null,"abstract":"Using different solid solution treatments, two structural states were produced in high-interstitial austenitic Fe-19Cr-22Mn-1.6V-0.4C-0.8N and Fe-22Cr-26Mn-1.3V-0.7C-1.2N (all in wt %) steels. Room...","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76827519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The paper presents a series of experimental works for the optimization of the thermal post-treatment process (quenching and artificial ageing) of the laser welding joints of aluminum-lithium alloy 1420 (the system Al-Mg-Li) by the temperature and time characteristics, in order to find the breaking stress, yield limit and ultimate tensile strain approaching to the respective characteristics of the main alloy, or equal to them. Low-cycle tests have been done with the thermally-treated welding joints for the pulsing stretching at various loading amplitudes at the temperatures of –60, +20, +85°С. The surface structure of ruptured welding joints with and without thermal treatment has been studied after low cycle tests at various loading amplitudes at the increased and decreased temperatures.
{"title":"Complex investigation of the mechanical properties and structural-phase composition of high-strength laser welding connections of the aluminum alloy 1420","authors":"A. Malikov, A. Orishich, E. Karpov, I. Vitoshkin","doi":"10.1063/1.5132083","DOIUrl":"https://doi.org/10.1063/1.5132083","url":null,"abstract":"The paper presents a series of experimental works for the optimization of the thermal post-treatment process (quenching and artificial ageing) of the laser welding joints of aluminum-lithium alloy 1420 (the system Al-Mg-Li) by the temperature and time characteristics, in order to find the breaking stress, yield limit and ultimate tensile strain approaching to the respective characteristics of the main alloy, or equal to them. Low-cycle tests have been done with the thermally-treated welding joints for the pulsing stretching at various loading amplitudes at the temperatures of –60, +20, +85°С. The surface structure of ruptured welding joints with and without thermal treatment has been studied after low cycle tests at various loading amplitudes at the increased and decreased temperatures.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73944677","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Bakulin, A. Fuks, M. Aksenov, N. A. Valisheva, S. Kulkova
The projector augmented-wave method is applied for investigation of oxygen and fluorine adsorption on the cation-terminated InAlAs(111) unreconstructed surface. The binding energies of both adsorbates with semiconductor surface are estimated. Their influence on the surface band structure and states within band gap is analyzed. It is shown that oxygen adsorption leads to appearance of additional surface states in the fundamental gap, whereas fluorine coadsorption results in partial or complete removal of the surface state and an unpinning of the Fermi level.The projector augmented-wave method is applied for investigation of oxygen and fluorine adsorption on the cation-terminated InAlAs(111) unreconstructed surface. The binding energies of both adsorbates with semiconductor surface are estimated. Their influence on the surface band structure and states within band gap is analyzed. It is shown that oxygen adsorption leads to appearance of additional surface states in the fundamental gap, whereas fluorine coadsorption results in partial or complete removal of the surface state and an unpinning of the Fermi level.
{"title":"The influence of oxygen and fluorine on the electronic structure of InAlAs surface","authors":"A. Bakulin, A. Fuks, M. Aksenov, N. A. Valisheva, S. Kulkova","doi":"10.1063/1.5131893","DOIUrl":"https://doi.org/10.1063/1.5131893","url":null,"abstract":"The projector augmented-wave method is applied for investigation of oxygen and fluorine adsorption on the cation-terminated InAlAs(111) unreconstructed surface. The binding energies of both adsorbates with semiconductor surface are estimated. Their influence on the surface band structure and states within band gap is analyzed. It is shown that oxygen adsorption leads to appearance of additional surface states in the fundamental gap, whereas fluorine coadsorption results in partial or complete removal of the surface state and an unpinning of the Fermi level.The projector augmented-wave method is applied for investigation of oxygen and fluorine adsorption on the cation-terminated InAlAs(111) unreconstructed surface. The binding energies of both adsorbates with semiconductor surface are estimated. Their influence on the surface band structure and states within band gap is analyzed. It is shown that oxygen adsorption leads to appearance of additional surface states in the fundamental gap, whereas fluorine coadsorption results in partial or complete removal of the surface state and an unpinning of the Fermi level.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90743191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The effect of a strain rate varying from ∼10−3 to ∼10−5 s−1 at a strain amplitude ranging from ±0.25% to ±0.6% on the low cycle fatigue (LCF) behavior and the microstructure of a 10%Cr-2%W-0.7%Mo-3%Co-NbV steel with 0.008 wt.% B and 0.003 wt.% N additions was studied at room temperature. The number of cycles to failure tends to slightly increase with decreasing the strain rate. The fatigue lifetime curves at all tested strain rates and strain amplitudes could be described using the Basquin-Manson-Coffin relationship. The transition life of 2Nt, when plastic and elastic strain components are equal, shifted to higher reversals with a decrease in the strain rate from ∼10−3 to ∼10−4 and ∼10−5 s−1, whereas the transition total strain amplitude, when plastic and elastic strain components are equal, remained unchanged. It was found that despite the weak influence of strain rate on the lifetime and microhardness, a decrease in the strain rate facilitates the knitting reaction.The effect of a strain rate varying from ∼10−3 to ∼10−5 s−1 at a strain amplitude ranging from ±0.25% to ±0.6% on the low cycle fatigue (LCF) behavior and the microstructure of a 10%Cr-2%W-0.7%Mo-3%Co-NbV steel with 0.008 wt.% B and 0.003 wt.% N additions was studied at room temperature. The number of cycles to failure tends to slightly increase with decreasing the strain rate. The fatigue lifetime curves at all tested strain rates and strain amplitudes could be described using the Basquin-Manson-Coffin relationship. The transition life of 2Nt, when plastic and elastic strain components are equal, shifted to higher reversals with a decrease in the strain rate from ∼10−3 to ∼10−4 and ∼10−5 s−1, whereas the transition total strain amplitude, when plastic and elastic strain components are equal, remained unchanged. It was found that despite the weak influence of strain rate on the lifetime and microhardness, a decrease in the strain rate facilitates the knitting reaction.
{"title":"Effect of the strain rate on the low cycle fatigue behavior of a 10Cr-2W-Mo-3Co-NbV steel at room temperature","authors":"R. Mishnev, N. Dudova, R. Kaibyshev","doi":"10.1063/1.5132099","DOIUrl":"https://doi.org/10.1063/1.5132099","url":null,"abstract":"The effect of a strain rate varying from ∼10−3 to ∼10−5 s−1 at a strain amplitude ranging from ±0.25% to ±0.6% on the low cycle fatigue (LCF) behavior and the microstructure of a 10%Cr-2%W-0.7%Mo-3%Co-NbV steel with 0.008 wt.% B and 0.003 wt.% N additions was studied at room temperature. The number of cycles to failure tends to slightly increase with decreasing the strain rate. The fatigue lifetime curves at all tested strain rates and strain amplitudes could be described using the Basquin-Manson-Coffin relationship. The transition life of 2Nt, when plastic and elastic strain components are equal, shifted to higher reversals with a decrease in the strain rate from ∼10−3 to ∼10−4 and ∼10−5 s−1, whereas the transition total strain amplitude, when plastic and elastic strain components are equal, remained unchanged. It was found that despite the weak influence of strain rate on the lifetime and microhardness, a decrease in the strain rate facilitates the knitting reaction.The effect of a strain rate varying from ∼10−3 to ∼10−5 s−1 at a strain amplitude ranging from ±0.25% to ±0.6% on the low cycle fatigue (LCF) behavior and the microstructure of a 10%Cr-2%W-0.7%Mo-3%Co-NbV steel with 0.008 wt.% B and 0.003 wt.% N additions was studied at room temperature. The number of cycles to failure tends to slightly increase with decreasing the strain rate. The fatigue lifetime curves at all tested strain rates and strain amplitudes could be described using the Basquin-Manson-Coffin relationship. The transition life of 2Nt, when plastic and elastic strain components are equal, shifted to higher reversals with a decrease in the strain rate from ∼10−3 to ∼10−4 and ∼10−5 s−1, whereas the transition total strain amplitude, when plastic and elastic strain components are equal, remained unchanged. It was found that despite the weak influence of strain rate on the lifetime and microhardness, a decrease in the strain rate facilitates the knitting reaction.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78457430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. Levin, K. Zingerman, A. Vershinin, D. Konovalov
An approach to the numerical modeling of stress state in a two-layered beam is developed for finite deformations. It is assumed that the first layer of the beam is preliminarily stressed, and then the second layer is added. The problem is formulated and solved using the theory of repeatedly superimposed finite strains. The spectral element method is used for the analysis. The spectral elements of variable order are used on non-conformal unstructured meshes. The computations are performed for the case of plane strain. It is assumed that the beam is made of the weakly compressible Mooney-Rivlin material. The incomplete junction of layers is considered. The numerical results are given for the case in which the first layer is preliminarily stretched along its axis. It is analyzed how the curvature of the beam after the junction of layers depends on the value of preliminary stretch. It is shown that this dependence is not monotone. The stress distribution in the composite beam is shown for a particular case. The proposed approach can be useful for the modeling of additive manufacturing. In this case the preliminary strains and stresses in the first layer are caused by thermal effects.An approach to the numerical modeling of stress state in a two-layered beam is developed for finite deformations. It is assumed that the first layer of the beam is preliminarily stressed, and then the second layer is added. The problem is formulated and solved using the theory of repeatedly superimposed finite strains. The spectral element method is used for the analysis. The spectral elements of variable order are used on non-conformal unstructured meshes. The computations are performed for the case of plane strain. It is assumed that the beam is made of the weakly compressible Mooney-Rivlin material. The incomplete junction of layers is considered. The numerical results are given for the case in which the first layer is preliminarily stretched along its axis. It is analyzed how the curvature of the beam after the junction of layers depends on the value of preliminary stretch. It is shown that this dependence is not monotone. The stress distribution in the composite beam is shown for a particular case. T...
{"title":"Finite deformation analysis of a prestressed elastic beam after the layer addition","authors":"V. Levin, K. Zingerman, A. Vershinin, D. Konovalov","doi":"10.1063/1.5132062","DOIUrl":"https://doi.org/10.1063/1.5132062","url":null,"abstract":"An approach to the numerical modeling of stress state in a two-layered beam is developed for finite deformations. It is assumed that the first layer of the beam is preliminarily stressed, and then the second layer is added. The problem is formulated and solved using the theory of repeatedly superimposed finite strains. The spectral element method is used for the analysis. The spectral elements of variable order are used on non-conformal unstructured meshes. The computations are performed for the case of plane strain. It is assumed that the beam is made of the weakly compressible Mooney-Rivlin material. The incomplete junction of layers is considered. The numerical results are given for the case in which the first layer is preliminarily stretched along its axis. It is analyzed how the curvature of the beam after the junction of layers depends on the value of preliminary stretch. It is shown that this dependence is not monotone. The stress distribution in the composite beam is shown for a particular case. The proposed approach can be useful for the modeling of additive manufacturing. In this case the preliminary strains and stresses in the first layer are caused by thermal effects.An approach to the numerical modeling of stress state in a two-layered beam is developed for finite deformations. It is assumed that the first layer of the beam is preliminarily stressed, and then the second layer is added. The problem is formulated and solved using the theory of repeatedly superimposed finite strains. The spectral element method is used for the analysis. The spectral elements of variable order are used on non-conformal unstructured meshes. The computations are performed for the case of plane strain. It is assumed that the beam is made of the weakly compressible Mooney-Rivlin material. The incomplete junction of layers is considered. The numerical results are given for the case in which the first layer is preliminarily stretched along its axis. It is analyzed how the curvature of the beam after the junction of layers depends on the value of preliminary stretch. It is shown that this dependence is not monotone. The stress distribution in the composite beam is shown for a particular case. T...","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91419525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
E. Velikanova, V. Matveeva, E. Krivkina, V. Sevostianova, M. Khanova, T. V. Glushkova, Y. Kudryavtseva, L. Antonova
An important area of tissue engineering is the development of small-dimeter vascular grafts. In our study we assessed whether an electrospun polymer scaffold is beneficial for developing a tissue-engineered graft. The polymeric grafts were made from a blend of polyhydroxybutyrate/valerate and polycaprolactone (PHBV/PCL) and added type I collagen. Additionally, the grafts were treated with fibronectin. Cells were isolated from the peripheral blood of patients with coronary artery disease (CAD) and then seeded on the luminal graft surface. Then, the grafts with cells were cultured in a pulsatile flow bioreactor. We confirmed that separate feeding of PHBV/PCL and type I collagen during electrospinning allows developing a scaffold for a vascular graft suitable for maintaining the viability of the endothelial layer on the luminal surface.An important area of tissue engineering is the development of small-dimeter vascular grafts. In our study we assessed whether an electrospun polymer scaffold is beneficial for developing a tissue-engineered graft. The polymeric grafts were made from a blend of polyhydroxybutyrate/valerate and polycaprolactone (PHBV/PCL) and added type I collagen. Additionally, the grafts were treated with fibronectin. Cells were isolated from the peripheral blood of patients with coronary artery disease (CAD) and then seeded on the luminal graft surface. Then, the grafts with cells were cultured in a pulsatile flow bioreactor. We confirmed that separate feeding of PHBV/PCL and type I collagen during electrospinning allows developing a scaffold for a vascular graft suitable for maintaining the viability of the endothelial layer on the luminal surface.
{"title":"Development of a polymeric scaffold for vascular tissue engineering","authors":"E. Velikanova, V. Matveeva, E. Krivkina, V. Sevostianova, M. Khanova, T. V. Glushkova, Y. Kudryavtseva, L. Antonova","doi":"10.1063/1.5132248","DOIUrl":"https://doi.org/10.1063/1.5132248","url":null,"abstract":"An important area of tissue engineering is the development of small-dimeter vascular grafts. In our study we assessed whether an electrospun polymer scaffold is beneficial for developing a tissue-engineered graft. The polymeric grafts were made from a blend of polyhydroxybutyrate/valerate and polycaprolactone (PHBV/PCL) and added type I collagen. Additionally, the grafts were treated with fibronectin. Cells were isolated from the peripheral blood of patients with coronary artery disease (CAD) and then seeded on the luminal graft surface. Then, the grafts with cells were cultured in a pulsatile flow bioreactor. We confirmed that separate feeding of PHBV/PCL and type I collagen during electrospinning allows developing a scaffold for a vascular graft suitable for maintaining the viability of the endothelial layer on the luminal surface.An important area of tissue engineering is the development of small-dimeter vascular grafts. In our study we assessed whether an electrospun polymer scaffold is beneficial for developing a tissue-engineered graft. The polymeric grafts were made from a blend of polyhydroxybutyrate/valerate and polycaprolactone (PHBV/PCL) and added type I collagen. Additionally, the grafts were treated with fibronectin. Cells were isolated from the peripheral blood of patients with coronary artery disease (CAD) and then seeded on the luminal graft surface. Then, the grafts with cells were cultured in a pulsatile flow bioreactor. We confirmed that separate feeding of PHBV/PCL and type I collagen during electrospinning allows developing a scaffold for a vascular graft suitable for maintaining the viability of the endothelial layer on the luminal surface.","PeriodicalId":20637,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83672841","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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