Moreover, if the surface moves from the plastic region into the rigid region, the strain rate is continuous and equals to zero.
此外，当界面的运动方向是由塑性区向刚性区扩展时，界面上的应变率也将保持连续并等于零。
The equations of loading surface and boundary surface are expressed in strain-energy releasing rate.
加载面、边界面方程均以损伤能量释放率表示。
In order to reflect the non-coaxial phenomenon, a non-coaxial plastic strain rate term is added to the tangential direction of conventional constitutive model's yield surface.
通过在屈服面的切线方向增加一项非共轴塑性应变增量，即可实现对非共轴现象的反映。
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