qugan 发表于 2012-5-10 20:11:31

应变率

请问大家，应变率，为什么在静力有限元中也有这个概念，静力并没有涉及时间，如何理解，谢谢

liuichini 发表于 2012-5-11 19:04:53

静力有限元分析中不应该出现应变率，请给出出处。

qugan 发表于 2012-5-11 20:21:57

但为什么经常有t+增量t,更新之类的算法

liuichini 发表于 2012-5-11 21:12:30

那个t是伪时间，不是真实的时间，通常表示载荷步。

zhangxd1985 发表于 2012-10-10 11:15:19

如果考虑粘弹性材料，静力荷载也会产生应变率的。

NoEureka 发表于 2013-1-10 17:26:59

应变率并一定是真实的时间，率可以看做是应变增量。

tonnyw 发表于 2013-1-11 03:08:46

In static analysis, we might also have strain rate or stress rate which is related to the load step size.

For example, for large strain problem, we don't have the traditional constitutive relationship which relates stresses to strains. Instead, the constitutive relationship is between stress rate and strain rate.

lanchenzhu 发表于 2013-4-5 10:57:30

tonnyw 发表于 2013-1-11 03:08 static/image/common/back.gif
In static analysis, we might also have strain rate or stress rate which is related to the load step...

how to get the strain rate based on some test data (for example,force-time curve)???? from some functions??

ggbbggb 发表于 2013-4-5 14:16:31

在塑性理论中，如flow rule 提到 塑性应变增量 与 塑性应变率 两者是差不多的概念，flow rule可以根据这两者同yield surface的关系(它们正交）来确定 associated flow rule，或 non-associated flow rule（它们不正交）。但是塑性应变增量是微量，而塑性应变率没必要是微量，所以在表达flow rule公示时，表达式上有区别，
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