Numerical examples demonstrate that the four node degenerated shell element proposed in this article has excellent performance and can avoid all kinds of locking problems.
数值结果表明，构造的四结点退化壳元拥有很好的性能，可避免各种自锁问题。
Four-node degenerated shell element and rigid shell element are used in our FEM model.
四结点蜕化壳单元和刚体壳单元分别用来建立权和模具的有限元模型；
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