The finite element method is used to to study progressive failure aspects of laminar composite skewed hypar shells with straight edges employing the eight-node isoparametric element in linear and elastic ranges under uniformly distributed static loading. A stiffness decrease scheme is proposed in which the stiffness properties of the failed element are gradually reduced resulting in redistribution of eveloping stresses on the extent of damage it accumulates. Specific numerical problems of earlier investigators are solved to validate the present approach. Numerical experiments are further carried out for different parametric variations, including some complicated boundary conditions and stacking orders of practical importance to obtain the first ply and progressive failure loads. Well accepted failure criteria are used to evaluate the failure loads and its development. Progressive failure in hypar shells are examined to arrive at some conclusions useful to the practicing engineers regarding tailoring guidelines of laminar composites and planning of nondestructive test programs for their health monitoring.

有限元方法被用来研究层状复合材料斜交hyper壳体的渐进破坏方面，该结构采用直角边的八节点等参单元，在均匀分布的静态载荷下处于线性和弹性范围。提出了一种降低刚度的方案，其中，逐渐降低失效单元的刚度特性，从而导致拉应力在损伤累积的程度上重新分布。解决了早期研究者的具体数值问题，以验证本方法。还针对不同的参数变化进行了数值实验，包括一些复杂的边界条件和具有实际重要性的堆叠顺序，以获得第一层和渐进式破坏载荷。公认的失效准则用于评估失效载荷及其发展。检查了肝壳的渐进性破坏，得出了一些有用的结论，这些信息对于从业工程师来说是关于层状复合材料的定制指南和健康监测计划的无损检测程序的计划。