Theory and application of a Bi-metal ring-stiffened cylinder under external pressure

A. Moshaiov*, E. R. Joelson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Ring-stiffened pressure vessels have historically been constructed of one material only (for example, steel); this is especially true in naval submarines. Existing codes for the design of pressure vessels subjected to external pressure such as ASME and the British Standard BS5500 refer explicitly to unimetal designs only where the stiffening rings and the shell are made of one material only. Bi-metal structures are not accommodated in the design codes. A parametric study is conducted by varying the Young's moduli ratio for the shell and stiffeners of a typical design. Trends in the vessel's critical collapse pressure, shell deflection, and principal stresses are analyzed and the significance of different failure criteria is examined. An approach for modifying current uni-metal design methodologies to accommodate bi-metal structures is suggested.

Original languageEnglish
Pages (from-to)291-297
Number of pages7
JournalJournal of Ship Research
Issue number4
StatePublished - Dec 1989


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