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发表于 2011-12-16 12:50:44
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来自 美国
xycf_a 发表于 2011-12-9 12:47
我以前可能想错了,现在觉得还是应该用真实应力(考虑了损伤弱化效果的)。 ...
今天刚好看到一个比较合理的解释,就贴上来了
The stress measure used in Abaqus is Cauchy or “true” stress, which corresponds to the force per current area.For geometrically nonlinear analysis, a large number of different strain measures exist. Unlike “true” stress, there is no clearly preferred “true” strain. For the same physical deformation different strain measures will report different values in large-strain analysis. The optimal choice of strain measure depends on analysis type, material behavior, and (to some degree) personal preference.
By default, the strain output in Abaqus/Standard is the “integrated” total strain (output variable E). For large-strain shells, membranes, and solid elements in Abaqus/Standard two other measures of total strain can be requested: logarithmic strain (output variable LE) and nominal strain (output variable NE).
Logarithmic strain (output variable LE) is the default strain output in Abaqus/Explicit; nominal strain (output variable NE) can be requested as well. The “integrated” total strain is not available in Abaqus/Explicit.
因此,缺省情况下,输出结果为真实应力(S)和真实应变(E/LE/NE)
另外,要理解好真实应力/应变和名义应力/应变的定义,不是所有的实验结果都必定以名义应力/应变给出,所以输入数据时,分清楚究竟需不需要进行转换。一句话,具体情况具体分析!
http://blog.sina.com.cn/s/blog_6e0aa6420100px35.html |
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