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发表于 2009-7-16 07:51:34
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来自 澳大利亚
本帖最后由 fuchong 于 2009-7-16 09:54 编辑
The modified second-order tetrahedral elements (C3D10M) in Abaqus/Standard are designed to be used in complex “hard” contact simulations. Regular second-order tetrahedral elements (C3D10 and C3D10I) have zero contact force at their corner nodes, leading to poor predictions of the contact pressures. They should, therefore, not be used in “hard” contact problems. The modified second-order tetrahedral elements can calculate the contact pressures accurately.
Second-order elements can be used in contact simulations with a penalty or augmented Lagrange constraint enforcement method (see “Contact constraint enforcement methods in Abaqus/Standard,” Section 33.1.2) to yield better stress distributions at the contact interface. The regular tetrahedral elements may not perform well in analyses involving impact or nearly incompressible material response, such as in problems with a large amount of plastic deformation. The modified second-order tetrahedral elements should be used in these circumstances. |
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