Based on the rigid plastic constitutive equation of lead, the damping force model of lead extrusion damper was deduced from the even plastic deformation energy method.

本文根据铅的刚塑性本构关系，利用均匀塑性变形能法，推导了铅挤压阻尼器的阻尼力滞回模型。

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Both the trend and the simulation data agree well with the experimental results, which affirms that the established plastic constitutive equation of milled powders is reasonable.

该趋势和模拟数值均与挤压实验结果基本一致，验证了所推导的球磨粉体本构方程的合理性。

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Introducing the plastic strain the differential constitutive equation for viscoelastic and plastic materials is deduced from multi-integral constitutive equation for nonlinear viscoelastic materials.

本文从非线性粘弹性物质的多重积分型本构方程出发，引入塑性应变，推导了粘弹塑性物质的微分型本构方程。

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