弹塑性问题
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Firstly, the discrete equations in differential form, which is used to solve elasto-plastic problems , is derived using variational principle.
首先，利用变分原理推导了微分形式求解弹塑性问题的离散方程。
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The conditions can be characterized by "polygonal" constitutive laws which influence behaviour of materials, such as elastic, elasto-plastic, contact problems and their combinations.
这种控制条件可由线性化折线型本构关系表征，其本构关系是广义的，包括弹性、塑性、接触及其组合单元。
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