The Experts below are selected from a list of 50349 Experts worldwide ranked by ideXlab platform
Nimish Pandiya - One of the best experts on this subject based on the ideXlab platform.
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extension of the static Equivalent Stress hypotheses to linearly vibrating systems using wave interference the liwi approach
International Journal of Fatigue, 2021Co-Authors: Alexander T. Schmidt, Nimish PandiyaAbstract:Abstract This paper presents a damage-Equivalent Stress, to be related to uniaxial S-N curves for mechanical systems undergoing multiaxial Stress cycles for evaluating fatigue strength. It covers variable and non-proportional loads, wherein the known static Equivalent-Stresses from von-Mises, Tresca and Rankine are extended to oscillating systems using wave interference. This novel approach is termed as LiWI (Linear Wave Interference) and leads to physically valid signal progressions, allowing for frequency content preservation, rotational invariance and application to static cases. Hence a unification of the Equivalent Stress descriptions in time, frequency and stochastic (power spectral density) domains for linear time invariant systems results.
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Extension of the static Equivalent Stress hypotheses to linearly vibrating systems using wave interference – The LiWi approach
International Journal of Fatigue, 1Co-Authors: Alexander T. Schmidt, Nimish PandiyaAbstract:Abstract This paper presents a damage-Equivalent Stress, to be related to uniaxial S-N curves for mechanical systems undergoing multiaxial Stress cycles for evaluating fatigue strength. It covers variable and non-proportional loads, wherein the known static Equivalent-Stresses from von-Mises, Tresca and Rankine are extended to oscillating systems using wave interference. This novel approach is termed as LiWI (Linear Wave Interference) and leads to physically valid signal progressions, allowing for frequency content preservation, rotational invariance and application to static cases. Hence a unification of the Equivalent Stress descriptions in time, frequency and stochastic (power spectral density) domains for linear time invariant systems results.
Chengkai Jiang - One of the best experts on this subject based on the ideXlab platform.
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a new form of Equivalent Stress for combined axial torsional loading considering the tension compression asymmetry of polymeric materials
RSC Advances, 2015Co-Authors: Jianwei Zhang, Chengkai Jiang, Han Jiang, Guozheng Kang, Fucong LuAbstract:Although the von Mises criterion has been generally adopted to obtain the Equivalent Stress for materials under multiaxial loading, it does not consider the influence of the tension–compression asymmetry of pressure-sensitive materials. For polymeric materials, to include the non-negligible effect of the tension–compression asymmetry, this work proposes a new form of Equivalent Stress in which the tensile and compressive yield strengths are presented. This form is compared with the work of von Mises, Bai and Christensen with the support of experimental data. It was found that the proposed form is more suitable for polymeric materials under combined axial–torsional loading conditions. The implications of the present findings for designing Stress-controlled combined axial–torsional loading experiments are also discussed.
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A new form of Equivalent Stress for combined axial–torsional loading considering the tension–compression asymmetry of polymeric materials
RSC Advances, 2015Co-Authors: Jianwei Zhang, Han Jiang, Guozheng Kang, Chengkai JiangAbstract:Although the von Mises criterion has been generally adopted to obtain the Equivalent Stress for materials under multiaxial loading, it does not consider the influence of the tension–compression asymmetry of pressure-sensitive materials. For polymeric materials, to include the non-negligible effect of the tension–compression asymmetry, this work proposes a new form of Equivalent Stress in which the tensile and compressive yield strengths are presented. This form is compared with the work of von Mises, Bai and Christensen with the support of experimental data. It was found that the proposed form is more suitable for polymeric materials under combined axial–torsional loading conditions. The implications of the present findings for designing Stress-controlled combined axial–torsional loading experiments are also discussed.
Jianwei Zhang - One of the best experts on this subject based on the ideXlab platform.
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a new form of Equivalent Stress for combined axial torsional loading considering the tension compression asymmetry of polymeric materials
RSC Advances, 2015Co-Authors: Jianwei Zhang, Chengkai Jiang, Han Jiang, Guozheng Kang, Fucong LuAbstract:Although the von Mises criterion has been generally adopted to obtain the Equivalent Stress for materials under multiaxial loading, it does not consider the influence of the tension–compression asymmetry of pressure-sensitive materials. For polymeric materials, to include the non-negligible effect of the tension–compression asymmetry, this work proposes a new form of Equivalent Stress in which the tensile and compressive yield strengths are presented. This form is compared with the work of von Mises, Bai and Christensen with the support of experimental data. It was found that the proposed form is more suitable for polymeric materials under combined axial–torsional loading conditions. The implications of the present findings for designing Stress-controlled combined axial–torsional loading experiments are also discussed.
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A new form of Equivalent Stress for combined axial–torsional loading considering the tension–compression asymmetry of polymeric materials
RSC Advances, 2015Co-Authors: Jianwei Zhang, Han Jiang, Guozheng Kang, Chengkai JiangAbstract:Although the von Mises criterion has been generally adopted to obtain the Equivalent Stress for materials under multiaxial loading, it does not consider the influence of the tension–compression asymmetry of pressure-sensitive materials. For polymeric materials, to include the non-negligible effect of the tension–compression asymmetry, this work proposes a new form of Equivalent Stress in which the tensile and compressive yield strengths are presented. This form is compared with the work of von Mises, Bai and Christensen with the support of experimental data. It was found that the proposed form is more suitable for polymeric materials under combined axial–torsional loading conditions. The implications of the present findings for designing Stress-controlled combined axial–torsional loading experiments are also discussed.
Fucong Lu - One of the best experts on this subject based on the ideXlab platform.
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a new form of Equivalent Stress for combined axial torsional loading considering the tension compression asymmetry of polymeric materials
RSC Advances, 2015Co-Authors: Jianwei Zhang, Chengkai Jiang, Han Jiang, Guozheng Kang, Fucong LuAbstract:Although the von Mises criterion has been generally adopted to obtain the Equivalent Stress for materials under multiaxial loading, it does not consider the influence of the tension–compression asymmetry of pressure-sensitive materials. For polymeric materials, to include the non-negligible effect of the tension–compression asymmetry, this work proposes a new form of Equivalent Stress in which the tensile and compressive yield strengths are presented. This form is compared with the work of von Mises, Bai and Christensen with the support of experimental data. It was found that the proposed form is more suitable for polymeric materials under combined axial–torsional loading conditions. The implications of the present findings for designing Stress-controlled combined axial–torsional loading experiments are also discussed.
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, 2003Co-Authors: Stephane Dumoulin, Christine Chappuis, Laurent Tabourot, 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, Christine Chappuis, Laurent Tabourot, 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, Christine Chappuis, Laurent Tabourot, 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 (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.