In this study, the dieless bulging and nonlinear buckling behaviours of a stainless longan-shaped pressure hull were investigated. According to the Cassini oval equation, the longan shape has a shape index of 0.1. The lengths of the major and minor axes of the designed longan-shaped pressure hull were approximately 400 and 396 mm, respectively. The wall thickness of this pressure hull was 1 mm. The Huber–von Mises stress and first yielding load of the designed longan-shaped shell and its inscribed polyhedral preform were investigated analytically and experimentally. Moreover, the dieless bulging of the designed longan-shaped pressure hull was investigated numerically and experimentally by using the nonlinear finite element method and a hydrostatic test, respectively. The analytical, experimental, and numerical results exhibited good agreement with each other.

在这项研究中，研究了不锈钢龙眼形耐压船体的无模胀形和非线性屈曲行为。根据卡西尼椭圆方程，龙眼形状的形状指数为0.1。设计的龙眼形耐压船体的长轴和短轴长度分别约为400和396毫米。该耐压船体的壁厚为1毫米。对所设计的龙眼形壳及其内接多面体预制件的 Huber-von Mises 应力和首次屈服载荷进行了分析和实验研究。此外，利用非线性有限元方法和水压试验分别对所设计的龙眼形耐压船体的无模胀形进行了数值和实验研究。分析、实验、