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ls-dyna 970手册上有两处写到关于area weighted和volume weighted,一处是在*CONTROL_SHELL的THEORY,另一处在*SECTION_SHELL的ELFORM,都是14为area weigthed, 15为volume weighted。
如果要设置,是不是两个地方都要更改?
*CONTROL_SHELL的THEORY中说明写道:
For the 2D axisymmetric solid elements, high explosive applications work best with the area weighted approach and structural applications work best with the volume weighted approach. The volume weighted approach can lead to problems along the axis of symmetry under very large deformations. Often the symmetry condition is not obeyed, and the elements will kink along the axis. The volume weighted approach must be used if 2D shell elements are used in mesh.
我搜索了论坛中几乎所有关于area和volume weighted的帖子,都没有一个明确的说法。只知道前者是面积加权,按周向分布载荷;后者体积加权,按径向分布载荷。有人说,shell单元必须使用volume weighted,不知是不是根据上面最后一句话得出的结论。
用面积加权和体积加权算出的结果不一样,这两个都能算的情况下,到底该选哪个?
希望大家来讨论一下。 |
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