中文摘要：

自弹塑性力学的广义变分原理问世以来，如何将塑性增量理论（塑性流动理论）的变分原理和广义变分原理写成更加规范的形式，一直是塑性力学专家和变分原理专家努力的方向．该文借助弹塑性本构关系研究的新进展，按照广义力和广义位移之间的对应关系，将塑性增量理论的基本方程乘上相应的虚量，然后积分，并代数相加，进而推导出了形式规范的塑性增量理论的变分原理和广义变分原理．

英文摘要：

Since the generalized variational principle of elasto-plastic mechanics was developed, it has been a problem for scientists and researchers to incorporate these variational principles with plastic flow theory of more standard forms. In this paper the latest developments in elasto-plastic constitutive theory and under- standings of the relationship between general force and general displacement are applied, and the equilibri-um and geometrical equations for plastic flow theory were multiplied by related virtual quantities, then integration was made with respect to volume and area, and finally an algebraic addition was performed.