ABSTRACT

The purpose of this paper is to elaborate the non-linear collapse of externally pressurized resin toroidal and cylindrical shells, along with a comparison between a toroid and cylinder. For this purpose, the collapse characteristics, critical loads, and imperfection sensitivities of volume equivalent shells were numerically evaluated for the first eigenmode imperfection. Furthermore, three nominally identical toroidal shells and three equivalent cylindrical shells were rapidly prototyped, optically scanned, ultrasonically measured, hydrostatically tested, and numerically examined. The numerical and experimental data were consistent with each other. The average pressure supporting capacity of the toroidal shell was approximately 29% higher than that of its volume equivalent cylindrical shell, thus demonstrating a superior pressure supporting capacity of the toroid. The knock down factors of the cylindrical shell were considerably lower than those of the toroidal shell, thus indicating that the toroidal shell is considerably less sensitive to initial geometrical imperfection than the cylindrical shell.

摘要

本文的目的是阐述外部加压树脂环形壳和圆柱壳的非线性塌陷，以及环形壳和圆柱壳之间的比较。为此，对第一本征模态缺陷的体积等效壳体的坍塌特性，临界载荷和缺陷敏感性进行了数值评估。此外，对三个名义上相同的环形壳和三个等效的圆柱壳进行了快速原型，光学扫描，超声测量，静水压测试和数值检查。数值和实验数据相互一致。环形壳体的平均压力承受能力比其等效体积的圆柱形壳体高约29％，因此证明了超环面的超强压力承受能力。圆柱壳的击倒系数远低于环形壳，因此表明，环形壳对初始几何缺陷的敏感性远小于圆柱壳。