壳体结构弹塑性大应变动态响应分析

本文利用假设剪切应和薄膜应变场的新型退化壳单元，并考虑大应主影响对壳体结构弹塑性动态分析进行了研究，并编制了相应的程度，此程序采用修正的Ｌａｇｒａｎｇｉａｎ公式，它不仅考虑了大变形大应变的影响，还对单元的节点坐标和厚度在每个时间步后都给予修正，通过对一些算例计算表明，此程序数值精度很好，可用于壳体结构的工程分析，并得出结论，对于应变问题考虑和忽略大应变影响将有较大的不同。

Large Strain Elasto-plastic Dynamic Responce Analysisof Shell Sthuctures

In this paper.a refined degenerated shell element with assumed transrerse shear and membrancestrains is adopted. The Program of Elasto-Plastic Large strain analysis of shell structures (LEPD) hasbeen developed from new degenerated shell element theory. In the updated Lagrangian transient dy-namic formulations, the geometrical material nonlinear effect and large strain are considered. Thenodal coordinates and the thickness of element are updated after each time step. Some numerical exam-ples for elastic and elasto-plastic dynamic analysis are given. The numerical results show that the accu-racy of the program is good.