Dieless bulging and nonlinear buckling of longan-shaped pressure hull

• Published in: International journal of naval architecture and ocean engineering Vol. 15; pp. 100548 - 18
• Main Authors: He, Rui, Zhang, Jian, Kaewunruen, Sakdirat, Zhan, Ming, Liu, Ping
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.2023; Elsevier; 대한조선학회
• Subjects: Buckling behavior; Dieless bulging; Longan-shaped geometry; Pressure hull; 조선공학; Pressure hull; Longan-shaped geometry; Buckling behavior; Dieless bulging
• ISSN: 2092-6782; 2092-6790
• DOI: 10.1016/j.ijnaoe.2023.100548

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. •Longan-shaped pressure hull was fabricated using dieless bulging technique.•Collapse of bulged pressure hull were explored under external pressure.•Analytical stresses and yielding loads of preform and hull were derived.•Analytical, experimental, and numerical results exhibited a good agreement.