采用塑性变形理论和刚粘塑性材料模型研究了直流电阻对焊接头的塑性变形。

The joint deformation of DC upset butt welding was studied by using theory of plastic deformation and rigid-viscosity plastic material model.

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结合堆载预压加固软基实例，分别采用殷宗泽双屈服面模型、粘弹-粘塑性和粘弹-粘塑性损伤模型进行有限元分析。

Deformation of preloaded soft ground was calculated with the Yin's double yield surface model, the viscoelastic-viscoplastic model and the viscoelastic-viscoplastic damage model respectively.

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论述了刚（粘）塑性有限元法的主要思想和处理方法。基于前期的本构模型，得出了刚（粘）塑性有限元法的求解列式。并对有限元数值模拟的发展前景作了预测。

Based on a former constitutive model, the calculation formulas for rigid-(visco) plasticity FEM were worked out, and an overview on the development of FEM numerical simulation was made.

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