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

轴向载荷作用下圆柱壳的承载能力主要受其偏离理想几何形状和载荷作用的影响。因此，许多出版物建议采用概率设计方法来解释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。这些载荷特别是组合载荷下的屈曲载荷分布尚未得到研究。本文的目标是确定圆柱壳在各种荷载组合作用下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。在此基础上，提出了多轴向载荷圆柱壳的概率设计方法。研究将进行轴压和扭转以及轴压和弯曲的组合。为了研究长细比和各向异性的影响，对纤维复合材料圆柱体、加筋和非加筋各向同性圆柱体进行了试验和分析。

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.