求助：型材挤压计算中的问题:Bad element shape
浏览：100007 回答：3
Bad element shape
This is a error created in the FEM engine which warns of dangerous distortion in the mesh of a 3D simulation. The two main causes for this error is a negative jacobian shape which cannot be resolved or a lack of flow stress values. In the case of the negative jacobian, the problematic elements (along with the node coordinates for the problem elements) will be listed in the file BUG.MSG. If every element in the mesh is listed, the flow stress for the object was probably not defined. If there are only a few elements listed, the user may try to load the bad step into the Pre-Processor and check the shape of the elements and the Boundary Condition code. The importance of well defined boundary conditions can not be overemphasized. This includes meaningful contact conditions and fixed velocity conditions.
在我的Ｃａｓｅ里面，有表面的几个单元出现了很差的形状，或者出现尖角突出，或者出现台阶状，我认为这是由于计算误差所导致的，但是在Ｋｅｙ文件中没有设置坯料的边界条件，也不是流变应力的问题，请问有没有其它因素导致Bad element shape的问题？网格尺寸以及网格重画的设置对它有没有影响，希望师兄师姐们能分享一下这方面的经验
This is a error created in the FEM engine which warns of dangerous distortion in the mesh of a 3D simulation. The two main causes for this error is a negative jacobian shape which cannot be resolved or a lack of flow stress values. In the case of the negative jacobian, the problematic elements (along with the node coordinates for the problem elements) will be listed in the file BUG.MSG. If every element in the mesh is listed, the flow stress for the object was probably not defined. If there are only a few elements listed, the user may try to load the bad step into the Pre-Processor and check the shape of the elements and the Boundary Condition code. The importance of well defined boundary conditions can not be overemphasized. This includes meaningful contact conditions and fixed velocity conditions.
在我的Ｃａｓｅ里面，有表面的几个单元出现了很差的形状，或者出现尖角突出，或者出现台阶状，我认为这是由于计算误差所导致的，但是在Ｋｅｙ文件中没有设置坯料的边界条件，也不是流变应力的问题，请问有没有其它因素导致Bad element shape的问题？网格尺寸以及网格重画的设置对它有没有影响，希望师兄师姐们能分享一下这方面的经验
leishengyuan 
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