增量理论指的是由于材料在进入塑性状态时的非线性性质和塑性变形的不可恢复的特点，因此须研究应力增量和应变增量之间的关系。
... 增量函数 increment function 增量理论 incremental theory 增量算子 growth operator ...
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Both incremental theory(IT) and deformation theory(DT) are adopted. The derivations of the governing differential equations and the expressions of the internal forces are described in detail.
为了考虑横向剪切变形的影响,采用了Mindlin板理论和全量理论和增量理论,推导了相应的控制微分方程与内力的表达式。
参考来源 - 矩形厚板弹塑性屈曲的微分求积法分析And the chapter elaborates the material yield criterion, points out increment theory elastic plastic matrix and plastic matrix and the finite element method of elastic plastic problem.5.
4.介绍了材料非线性理论,其中包括:材料屈服准则、增量理论的弹塑性矩阵通式以及弹塑性问题的有限元法。
参考来源 - 大跨径拱式拱上结构石拱桥极限承载力分析·2,447,543篇论文数据，部分数据来源于NoteExpress
用非线性弹性增量理论解释了变形和应力的关系并说明验算裂缝的方法。
The relation between deformation and stress was explained with nonlinear elastic increment theory, and the method of checking the cracking rupture was also given.
本文采用有限元法和增量理论对小位移小应变的弹塑性接触问题进行分析。
In this paper, the contact problems of small displacement and strain have been analysed by finite element method and incremental theory.
结果表明，全量理论可代替增量理论分析、计算拉延成形过程的力和变形等。
It is concluded that the total strain theory can be used as a substitute for the incremental strain theory to analyse the force and deformation in sheet metal deep-drawing process.
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