The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Noelle Billon - One of the best experts on this subject based on the ideXlab platform.
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large Strain time dependent mechanical behaviour of pmmas of different chain architectures application of time temperature superposition principle
Polymer, 2018Co-Authors: C E Federico, Jean-luc Bouvard, Christelle Combeaud, Noelle BillonAbstract:Abstract The relevance of Equivalent Strain rate at reference temperature derived from time/temperature superposition principle is validated as a constitutive parameter at large Strain for PMMAs of different chain architecture. Shift factors were obtained from DMTA at infinitesimal Strain, then identified according to Williams-Landel-Ferry or Arrhenius equations and finally extended to large deformations. Mechanical behaviour was characterized under cyclic tensile loading. So-called 3D digital image correlation was used to measure local Strain. It is demonstrated that for different experimental conditions having same Equivalent Strain rate, the macroscopic behaviour will be the same. This was validated for elastoplastic, viscoelastic and rubbery behaviours. Such experimental observations indicate that time/temperature superposition at low Strain can be extended for large deformation for PMMA. Additionally, the study opens a new way of addressing the temperature and Strain rate dependencies in constitutive model by using the Equivalent Strain rate at reference temperature as a unique parameter.
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Large Strain/time dependent mechanical behaviour of PMMAs of different chain architectures. Application of time-temperature superposition principle
Polymer, 2018Co-Authors: C E Federico, Jean-luc Bouvard, Christelle Combeaud, Noelle BillonAbstract:Abstract The relevance of Equivalent Strain rate at reference temperature derived from time/temperature superposition principle is validated as a constitutive parameter at large Strain for PMMAs of different chain architecture. Shift factors were obtained from DMTA at infinitesimal Strain, then identified according to Williams-Landel-Ferry or Arrhenius equations and finally extended to large deformations. Mechanical behaviour was characterized under cyclic tensile loading. So-called 3D digital image correlation was used to measure local Strain. It is demonstrated that for different experimental conditions having same Equivalent Strain rate, the macroscopic behaviour will be the same. This was validated for elastoplastic, viscoelastic and rubbery behaviours. Such experimental observations indicate that time/temperature superposition at low Strain can be extended for large deformation for PMMA. Additionally, the study opens a new way of addressing the temperature and Strain rate dependencies in constitutive model by using the Equivalent Strain rate at reference temperature as a unique parameter.
Robert Arrieux - One of the best experts on this subject based on the ideXlab platform.
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Determination of the Equivalent stress–Equivalent Strain relationship of a copper sample under tensile loading
Journal of Materials Processing Technology, 2020Co-Authors: Stephane Dumoulin, Laurent Tabourot, Christine Chappuis, Pierre Vacher, Robert ArrieuxAbstract:International audienceAbstract In this paper, a new method is used to determine the true stress–true Strain curve. As this method still makes use of a tensile test, the results are compared with the results obtained with an extensometer on a copper sample for which the Strain between the grips is supposed to be homogeneous. In the present case, the deformation is determined using a correlation method applied to successive images of one randomly painted sample face. The calculated Strain field brings into evidence an increasing heterogeneity at high deformations. Taking this heterogeneity into account allows a more precise computation of the Equivalent stress–Equivalent Strain curve which is used in a finite element simulation of the tensile test. Comparing the results of the simulation with those of image analysis, it appears that a corrected Equivalent stress–Equivalent Strain relationship is sufficient to obtain a correct behaviour up to necking. The simulation also shows that the necking in the material is obtained when a necking criterion (Considère's criterion) is verified. It indicates that in this case only the datum of the σeq=f(eq) relationship is sufficient to obtain the whole behaviour of the material
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determination of the Equivalent stress Equivalent Strain relationship of a copper sample under tensile loading
Journal of Materials Processing Technology, 2003Co-Authors: Stephane Dumoulin, Laurent Tabourot, Christine Chappuis, Pierre Vacher, Robert ArrieuxAbstract:Abstract In this paper, a new method is used to determine the true stress–true Strain curve. As this method still makes use of a tensile test, the results are compared with the results obtained with an extensometer on a copper sample for which the Strain between the grips is supposed to be homogeneous. In the present case, the deformation is determined using a correlation method applied to successive images of one randomly painted sample face. The calculated Strain field brings into evidence an increasing heterogeneity at high deformations. Taking this heterogeneity into account allows a more precise computation of the Equivalent stress–Equivalent Strain curve which is used in a finite element simulation of the tensile test. Comparing the results of the simulation with those of image analysis, it appears that a corrected Equivalent stress–Equivalent Strain relationship is sufficient to obtain a correct behaviour up to necking. The simulation also shows that the necking in the material is obtained when a necking criterion (Considere’s criterion) is verified. It indicates that in this case only the datum of the σ eq = f ( e eq ) relationship is sufficient to obtain the whole behaviour of the material.
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Determination of the Equivalent stress–Equivalent Strain relationship of a copper sample under tensile loading
Journal of Materials Processing Technology, 2003Co-Authors: Stephane Dumoulin, Laurent Tabourot, Christine Chappuis, Pierre Vacher, Robert ArrieuxAbstract:Abstract In this paper, a new method is used to determine the true stress–true Strain curve. As this method still makes use of a tensile test, the results are compared with the results obtained with an extensometer on a copper sample for which the Strain between the grips is supposed to be homogeneous. In the present case, the deformation is determined using a correlation method applied to successive images of one randomly painted sample face. The calculated Strain field brings into evidence an increasing heterogeneity at high deformations. Taking this heterogeneity into account allows a more precise computation of the Equivalent stress–Equivalent Strain curve which is used in a finite element simulation of the tensile test. Comparing the results of the simulation with those of image analysis, it appears that a corrected Equivalent stress–Equivalent Strain relationship is sufficient to obtain a correct behaviour up to necking. The simulation also shows that the necking in the material is obtained when a necking criterion (Considere’s criterion) is verified. It indicates that in this case only the datum of the σ eq = f ( e eq ) relationship is sufficient to obtain the whole behaviour of the material.
C E Federico - One of the best experts on this subject based on the ideXlab platform.
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large Strain time dependent mechanical behaviour of pmmas of different chain architectures application of time temperature superposition principle
Polymer, 2018Co-Authors: C E Federico, Jean-luc Bouvard, Christelle Combeaud, Noelle BillonAbstract:Abstract The relevance of Equivalent Strain rate at reference temperature derived from time/temperature superposition principle is validated as a constitutive parameter at large Strain for PMMAs of different chain architecture. Shift factors were obtained from DMTA at infinitesimal Strain, then identified according to Williams-Landel-Ferry or Arrhenius equations and finally extended to large deformations. Mechanical behaviour was characterized under cyclic tensile loading. So-called 3D digital image correlation was used to measure local Strain. It is demonstrated that for different experimental conditions having same Equivalent Strain rate, the macroscopic behaviour will be the same. This was validated for elastoplastic, viscoelastic and rubbery behaviours. Such experimental observations indicate that time/temperature superposition at low Strain can be extended for large deformation for PMMA. Additionally, the study opens a new way of addressing the temperature and Strain rate dependencies in constitutive model by using the Equivalent Strain rate at reference temperature as a unique parameter.
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Large Strain/time dependent mechanical behaviour of PMMAs of different chain architectures. Application of time-temperature superposition principle
Polymer, 2018Co-Authors: C E Federico, Jean-luc Bouvard, Christelle Combeaud, Noelle BillonAbstract:Abstract The relevance of Equivalent Strain rate at reference temperature derived from time/temperature superposition principle is validated as a constitutive parameter at large Strain for PMMAs of different chain architecture. Shift factors were obtained from DMTA at infinitesimal Strain, then identified according to Williams-Landel-Ferry or Arrhenius equations and finally extended to large deformations. Mechanical behaviour was characterized under cyclic tensile loading. So-called 3D digital image correlation was used to measure local Strain. It is demonstrated that for different experimental conditions having same Equivalent Strain rate, the macroscopic behaviour will be the same. This was validated for elastoplastic, viscoelastic and rubbery behaviours. Such experimental observations indicate that time/temperature superposition at low Strain can be extended for large deformation for PMMA. Additionally, the study opens a new way of addressing the temperature and Strain rate dependencies in constitutive model by using the Equivalent Strain rate at reference temperature as a unique parameter.
Stephane Dumoulin - One of the best experts on this subject based on the ideXlab platform.
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Determination of the Equivalent stress–Equivalent Strain relationship of a copper sample under tensile loading
Journal of Materials Processing Technology, 2020Co-Authors: Stephane Dumoulin, Laurent Tabourot, Christine Chappuis, Pierre Vacher, Robert ArrieuxAbstract:International audienceAbstract In this paper, a new method is used to determine the true stress–true Strain curve. As this method still makes use of a tensile test, the results are compared with the results obtained with an extensometer on a copper sample for which the Strain between the grips is supposed to be homogeneous. In the present case, the deformation is determined using a correlation method applied to successive images of one randomly painted sample face. The calculated Strain field brings into evidence an increasing heterogeneity at high deformations. Taking this heterogeneity into account allows a more precise computation of the Equivalent stress–Equivalent Strain curve which is used in a finite element simulation of the tensile test. Comparing the results of the simulation with those of image analysis, it appears that a corrected Equivalent stress–Equivalent Strain relationship is sufficient to obtain a correct behaviour up to necking. The simulation also shows that the necking in the material is obtained when a necking criterion (Considère's criterion) is verified. It indicates that in this case only the datum of the σeq=f(eq) relationship is sufficient to obtain the whole behaviour of the material
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determination of the Equivalent stress Equivalent Strain relationship of a copper sample under tensile loading
Journal of Materials Processing Technology, 2003Co-Authors: Stephane Dumoulin, Laurent Tabourot, Christine Chappuis, Pierre Vacher, Robert ArrieuxAbstract:Abstract In this paper, a new method is used to determine the true stress–true Strain curve. As this method still makes use of a tensile test, the results are compared with the results obtained with an extensometer on a copper sample for which the Strain between the grips is supposed to be homogeneous. In the present case, the deformation is determined using a correlation method applied to successive images of one randomly painted sample face. The calculated Strain field brings into evidence an increasing heterogeneity at high deformations. Taking this heterogeneity into account allows a more precise computation of the Equivalent stress–Equivalent Strain curve which is used in a finite element simulation of the tensile test. Comparing the results of the simulation with those of image analysis, it appears that a corrected Equivalent stress–Equivalent Strain relationship is sufficient to obtain a correct behaviour up to necking. The simulation also shows that the necking in the material is obtained when a necking criterion (Considere’s criterion) is verified. It indicates that in this case only the datum of the σ eq = f ( e eq ) relationship is sufficient to obtain the whole behaviour of the material.
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Determination of the Equivalent stress–Equivalent Strain relationship of a copper sample under tensile loading
Journal of Materials Processing Technology, 2003Co-Authors: Stephane Dumoulin, Laurent Tabourot, Christine Chappuis, Pierre Vacher, Robert ArrieuxAbstract:Abstract In this paper, a new method is used to determine the true stress–true Strain curve. As this method still makes use of a tensile test, the results are compared with the results obtained with an extensometer on a copper sample for which the Strain between the grips is supposed to be homogeneous. In the present case, the deformation is determined using a correlation method applied to successive images of one randomly painted sample face. The calculated Strain field brings into evidence an increasing heterogeneity at high deformations. Taking this heterogeneity into account allows a more precise computation of the Equivalent stress–Equivalent Strain curve which is used in a finite element simulation of the tensile test. Comparing the results of the simulation with those of image analysis, it appears that a corrected Equivalent stress–Equivalent Strain relationship is sufficient to obtain a correct behaviour up to necking. The simulation also shows that the necking in the material is obtained when a necking criterion (Considere’s criterion) is verified. It indicates that in this case only the datum of the σ eq = f ( e eq ) relationship is sufficient to obtain the whole behaviour of the material.
Jean-luc Bouvard - One of the best experts on this subject based on the ideXlab platform.
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large Strain time dependent mechanical behaviour of pmmas of different chain architectures application of time temperature superposition principle
Polymer, 2018Co-Authors: C E Federico, Jean-luc Bouvard, Christelle Combeaud, Noelle BillonAbstract:Abstract The relevance of Equivalent Strain rate at reference temperature derived from time/temperature superposition principle is validated as a constitutive parameter at large Strain for PMMAs of different chain architecture. Shift factors were obtained from DMTA at infinitesimal Strain, then identified according to Williams-Landel-Ferry or Arrhenius equations and finally extended to large deformations. Mechanical behaviour was characterized under cyclic tensile loading. So-called 3D digital image correlation was used to measure local Strain. It is demonstrated that for different experimental conditions having same Equivalent Strain rate, the macroscopic behaviour will be the same. This was validated for elastoplastic, viscoelastic and rubbery behaviours. Such experimental observations indicate that time/temperature superposition at low Strain can be extended for large deformation for PMMA. Additionally, the study opens a new way of addressing the temperature and Strain rate dependencies in constitutive model by using the Equivalent Strain rate at reference temperature as a unique parameter.
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Large Strain/time dependent mechanical behaviour of PMMAs of different chain architectures. Application of time-temperature superposition principle
Polymer, 2018Co-Authors: C E Federico, Jean-luc Bouvard, Christelle Combeaud, Noelle BillonAbstract:Abstract The relevance of Equivalent Strain rate at reference temperature derived from time/temperature superposition principle is validated as a constitutive parameter at large Strain for PMMAs of different chain architecture. Shift factors were obtained from DMTA at infinitesimal Strain, then identified according to Williams-Landel-Ferry or Arrhenius equations and finally extended to large deformations. Mechanical behaviour was characterized under cyclic tensile loading. So-called 3D digital image correlation was used to measure local Strain. It is demonstrated that for different experimental conditions having same Equivalent Strain rate, the macroscopic behaviour will be the same. This was validated for elastoplastic, viscoelastic and rubbery behaviours. Such experimental observations indicate that time/temperature superposition at low Strain can be extended for large deformation for PMMA. Additionally, the study opens a new way of addressing the temperature and Strain rate dependencies in constitutive model by using the Equivalent Strain rate at reference temperature as a unique parameter.