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首页> 美国政府科技报告 >Influence of Plastic-Strain-Induced Anisotropy, Modeled as Combined Isotropic-Kinematic Hardening, on the Stress Distributions Generated in the Finite Deformation of Ductile Metals
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Influence of Plastic-Strain-Induced Anisotropy, Modeled as Combined Isotropic-Kinematic Hardening, on the Stress Distributions Generated in the Finite Deformation of Ductile Metals

机译：塑性应变诱导各向异性的模拟 - 组合各向同性 - 运动硬化对韧性金属有限变形中产生的应力分布的影响

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For combined isotropic-kinematic hardening, the anisotropy generated by plasticflow is expressed by the back stress. The evolution equation for this contains form-invariant isotropic functions of the plastic strain rate and back stress and also involves the plastic spin. Numerical evaluations of the homogeneous simple shear problem show that inclusion of the spin associated with the plastic strain rate and the back stress tends to increase the predicted stiffness of the metal. A numerical analysis of tension-torsion tests of a thin tube revealed that a combination of isotropic and kinematic hardening, including the influence of spin on the evolution of the back stress, brings predicted stress responses in close agreement with the experimental data. The stress and strain distributions generated in axisymmetric extrusion have been evaluated by the finite-element method in order to study the importance of plastic-strain-induced anisotropy in the case of a forming problem involving nonhomogeneous strains. The influence of various material-dependent parameters on the stresses generated during extrusion is presented. For fixed ratios of isotropic to kinematic hardening, the nondimensional parameter which controls the contribution of spin to the evolution of the back stress was shown to have a significant influence on the residual stress distributions.

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