Prediction of the Effects of Cold Bending on Submarine Pressure Hull Collapse

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Authors
  1. Gannon, L.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN)
Abstract
Submarine pressure hull frames and shell plating are shaped by cold bending during fabrication. Cold bending introduces significant residual stress in these components which can be detrimental to the strength of the structure. This study evaluates different methods of incorporating cold bending residual stresses in the analysis of pressure hulls considering different out of circularity mode shapes. Several methods of pressure hull collapse analysis are compared considering interframe and overall collapse modes. These include an empirical method, a finite difference method and the finite element method. Collapse pressures predicted using the methods prescribed in the UK MoD submarine structure design standard, SSP 74, are found to be conservative when compared with results from finite element analysis. Collapse pressures predicted using effective stress-strain curves to incorporate the effects of cold bending residual stress in finite element models agree well with those predicted by explicitly modelling the cold bending process. This indicates that the use of effective stress-strain curves is an acceptable means of accounting for the influence of cold bending residual stress on the collapse pressure of a submarine pressure hull.

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Keywords
Submarine structure;Pressure hulls;Ring stiffened cylinder
Report Number
DRDC-ATLANTIC-TM-2010-065 — Technical Memorandum
Date of publication
01 Apr 2010
Number of Pages
48
DSTKIM No
CA034758
CANDIS No
534276
Format(s):
Electronic Document(PDF)

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