The strain path theory is different from the plastic flow theory since it gives a nonlinear relation between stress deviation increment and strain deviation increment.
应变路径理论与传统的增量理论不同之处在于其偏应力增量和偏应变增量之间为一非线性关系。
Based on the theory of elastic-plastic deformation, according to the finite element method, this paper presents a nonlinear analysis of the distribution of the soil pressure of the ditch conduit.
表明对大型沟埋式管道的上压力，采用弹塑性理论的非线性分析是比较符合实际的，其结果可供设计参考。
Based on the nonlinear, elastic-plastic finite element method theory, the modeling approach of the numerical simulation of incremental sheet metal forming was studied firstly in this project.
本课题基于非线性、弹塑性有限元理论方法，对金属板料渐进成形的数值模拟的建模方法进行研究。
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