派大星的星- 发表于 2018-12-27 20:25:51

心脏支架非线性结构单元高度扭曲

本帖最后由 派大星的星- 于 2018-12-27 20:25 编辑

小弟刚接触模拟,有些问题想请教下论坛大佬。
我做的是心脏支架的仿真,模拟支架的压缩和膨胀。支架采用solid186单元,六面体网格划分,压握壳和球囊采用sheell181单元,整体的网格Skewness平均值为0.27378,Jacobian Ratio为1.5238。要求模型不发生周向的转动,并且一端固定。我采用约束方式为:整体在柱坐标下约束,对压握壳和球囊一端轴向Displacement约束,并且施加周向Displacement约束;支架一端同样轴向Displacement约束,两端施加周向Displacement约束。在后处理时,无论施加多小的位移总是出现这些提示:
1.Element shape checking is currently inactive.Issue SHPP,ON orSHPP,WARN to reactivate, if desired.
2.Element 16536 located in Body "ZHIJIA" (and maybe other elements) has become highly distorted。3.One of the contact searching regions contains at least 127 target elements. You may reduce the pinball radius 。*WARNING*: Initial penetration is included.
4.It is highly recommended to use the auto contact setting option byissuing CNCHECK,AUTO command for this problem in order to achieve better convergence.
细化了网格还是失败,求教大佬有什么好办法。
1.材料的问题?支架材料只定义了弹性模量,泊松比,屈服强度,没有输入应力应变曲线。球囊采用Monney-Rivlin 2参数模型时,定义泊松比为0.495,那么弹性模量是不是随便输入。
2.约束问题?对支架一端约束时,作用在了一端的面上,不知道对不对,或者应该对节点约束?

派大星的星- 发表于 2018-12-27 20:34:52

有人吗,大哥
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