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含脱层的复合材料层板承受弯曲载荷作用会产生跳跃失稳,还常常引起脱层扩展,从而导致结构失效。本文用基于一阶剪切层板理论的几何非线性有限单元法分析了受弯曲载荷作用下含脱层层极的失稳的临界载荷。本文指出分叉失稳产生了跳跃失稳,而该跳跃失稳与浅圆拱或薄圆柱壳受向心压力作用下的跳跃失稳不同,在整体平衡路径上没有一个极限点。本文对临界载荷的计算结果比使用能量准则的结果要小,文中给出了原因。
Laminar composite laminates suffer from buckling loads when subjected to bending loads, often causing delamination expansion, resulting in structural failure. In this paper, based on the first-order shear laminar geometry theory, the nonlinear finite element method is used to analyze the critical load of delamination-layered instability under the bending load. This paper points out that the buckling instability produces the jump instability, and the jump instability is different from the jump instability under the centripetal pressure of shallow circular arch or thin cylindrical shell. There is no limit point in the overall equilibrium path. In this paper, the calculation results of the critical load are smaller than those of the energy criterion, and the reasons are given in the paper.