有限变形下的等效应力和等效应变问题

Effective Stress and Strain in Finite Deformation

重点讨论了在有限变形条件下,弹塑性理论中的等效应力、等效应变是否仍然成立· 选择了平面应力和平面应变下的单向压缩应力状态,对这一问题进行了探讨· 在这两种应力状态下,在众多的应力应变描述中。

Whether the concept of effective stress and strain in elastic-plastic theory is still valid under the condition of finite deformation was mainly discussed. The uni-axial compression experiments in plane stress and plane strain states were chosen for study. In the two kinds of stress states, the stress-strain curve described by logarithm strain and rotated Kirchhoff stress matches the experiments data better than the curves defined by other stress-strain description.