采用cohesive单元模拟胶层断裂，后处理没有应力输出，求解答

hxozm

各位大侠，最近我在尝试用cohesive单元模拟三维胶层的断裂，模型如图所示。

结果出来之后，胶层部分应力倒是有，但是对于比较关心的S12和S22，却显示为零。

想问问大侠，这是什么原因造成的呢？谢谢啦~

inp文件我放在了附件里，谢谢啦~

haobin_1988

xian xue xi yi xia:)

jay彻刘

新手，麻烦能发一下CAE吗？正在学习建模，谢谢。1547450649@qq.com

wwiiww

32.5.9 Three-dimensional cohesive element library  @ analysis guide

Cohesive elements using a traction-separation response

Stress and other tensors (including strain tensors) are available for elements with traction-separation response. Both the stress tensor and the strain tensor contain nominal values. The output variables E, LE, and NE all contain the nominal strain when the response of cohesive elements is defined in terms of traction versus separation. All tensors have the same number of components. For example, the stress components are as follows:

S33 Direct through-thickness stress.


S13 Transverse shear stress.


S23 Transverse shear stress.

wwiiww

Cohesive elements using a continuum response

Stress and other tensors (including strain tensors) are available for elements with continuum response. Both the stress tensor and the strain tensor contain true values. For the constitutive calculations using a continuum response, only the direct through-thickness and the transverse shear strains are assumed to be nonzero. All the other strain components (i.e., the membrane strains) are assumed to be zero (see “Modeling of an adhesive layer of finite thickness” in “Defining the constitutive response of cohesive elements using a continuum approach,” Section 32.5.5, for details). All tensors have the same number of components. For example, the stress components are as follows:

S11 Direct membrane stress.


S22 Direct membrane stress.


S33 Direct through-thickness stress.


S12 In-plane membrane shear stress.


S13 Transverse shear stress.


S23 Transverse shear stress.

wwiiww

才注意到是一个月前的帖子，应该已经解决了

采果实

我也想学习学习

逆时针向

受教了，一直在寻找求层间应力的方法