The paper is concerned with failure analysis of composite shells performed with the usage of the nonlinear 6-parameter shell theory with drilling rotation degree of freedom. This special theory embodies naturally unlimited translations and rotations and is suitable for analysis of irregular shells for instance with various, particularly orthogonal, intersections. The presence of the drilling rotation is inherently accompanied with asymmetry of in-plane shear stresses and strains which must be taken into account in the composite failure criteria. In the paper in general two failure measures are applied: Hashin criterion and Tsai-Wu criterion which are appropriately modified to accommodate the stress asymmetry. It is shown, that depending on the used failure criterion, it is possible to obtain slightly different damage zones and values of the first ply failure and ultimate load. These values are compared with those obtained experimentally.

本文涉及利用旋转自由度的非线性六参数壳理论进行复合材料壳的失效分析。这种特殊的理论自然包含无限的平移和旋转，适用于分析不规则壳，例如具有各种（尤其是正交）相交的壳。钻井旋转的存在固有地伴随着平面内剪切应力和应变的不对称，这在复合材料破坏准则中必须予以考虑。在本文中，通常采用两种失效措施：Hashin准则和Tsai-Wu准则，对其进行了适当修改以适应应力不对称。结果表明，根据使用的故障准则，可以获得略有不同的损坏区域以及第一层破坏和最终载荷的值。将这些值与实验获得的值进行比较。