The question about the mesh of crack tip

Bing Liu — Thu, 03 Apr 2008 09:30:06 -0400

I am working for the FE model of cracked pipes. I use Hypermesh to mesh the model, but the element can not be set to the C3D20R type. I donnot kwon why it is. So I can use the C3D15. Then I can th following error message:
***NOTE: THE COORDINATES OF NODES WITHIN THE SAME CLUSTER ARE NOT IDENTICAL. THIS IS THE CASE FOR NODES 22 1224

***ERROR: TRIANGLES, TETRAHEDRA, AND WEDGES MAY NOT BE USED IN A CONTOUR INTEGRAL REGION. ELEMENT 960 IS WITHIN A CONTOUR REGION

***WARNING: NO VALID ELEMENTS FOUND IN CONTOUR INTEGRAL REGION

What's wrong?

Thanks a lots for your time.

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The question about the mesh of crack tip