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[子程序] 请问子程序的STRAN, DSTRAN和STRESS是怎么定义的?

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发表于 2017-4-28 17:20:56 | 显示全部楼层 |阅读模式 来自 中国
请问UMAT子程序中输入的变量STRAN, DSTRAN和STRESS在数学上是怎样定义的?
STRAN
“An array containing the total strains at the beginning of the increment. If thermal expansion is included in the same material definition, the strains passed into UMAT are the mechanical strains only (that is, the thermal strains computed based upon the thermal expansion coefficient have been subtracted from the total strains). These strains are available for output as the “elastic” strains.In finite-strain problems the strain components have been rotated to account for rigid body motion in the increment before UMAT is called and are approximations to logarithmic strain.

” 我想问在有限变形中,strain components是怎样被旋转的?用数学表达式怎样表达?特别地,怎样用Green-Lagrangian应变表达?

对于DSTRAN有同样的疑问。

对于STRESS,文档上说:
"in finite-strain problems the stress tensor has already been rotated to account for rigid body motion in the increment before UMAT is called, so that only the corotational part of the stress integration should be done in UMAT. The measure of stress used is “true” (Cauchy) stress." 我想问这个旋转又是怎样做的?如果旋转了那它还是不是Cauchy应力?


谢谢了!


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