Experimental investigation and probabilistic analysis of the load carrying capability of cylindrical shells subject to multiaxial loading

轴向加载圆柱壳的承载能力主要由与理想几何形状和载荷应用的偏差驱动。因此，许多出版物建议概率设计方法，以考虑圆柱壳设计的随机缺陷。对于其他类型的载荷，如扭转和弯曲，承载能力不太敏感。对于这些类型的载荷，特别是组合载荷的屈曲载荷的分布，迄今为止还没有研究过。本提案的目的是确定承受各种载荷组合的圆柱壳承载能力的随机分布。这将通过屈曲实验和概率模拟来完成。基于这些结果，将发展一种多轴加载圆柱壳的概率设计方法。将对轴向压缩和扭转以及轴向压缩和弯曲的组合进行研究。为了研究细长和各向异性的影响，纤维复合材料圆柱和加筋和非加筋各向同性圆柱将进行测试和分析。

The load carrying capability of axially loaded cylindrical shells is mainly driven by deviations from the ideal geometry and load application. Therefore, a multitude of publications suggest probabilistic design approaches in order to account for the stochastic imperfection for the design of cylindrical shells. For other types of loading like torsion and bending the load carrying capability is less sensitive. The distribution of the buckling load for these types of loading and especially for combined loading has not been investigated so far. The objective of the current proposal is the determination of the stochastic distribution of the load carrying capability of cylindrical shells subject to various load combinations. This will be done by buckling experiments and probabilistic simulations. Based on the results, a probabilistic design method for multiaxially loaded cylindrical shells will be developed. The investigations will be carried out for combinations of axial compression and torsion as well as axial compression and bending. In order to investigate influence of slenderness and anisotropy, fiber composite cylinders and stiffened and unstiffened isotropic cylinders will be tested and analyzed.