Experimental investigation of the strength of damaged pressure hulls - Phase 4 – The influence of material properties on pressure hull collapse

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Authors
  1. MacKay, J.R.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN)
Abstract
This technical memorandum presents the results of Phase 4 of an experimental program aimed at determining the effects of corrosion damage on the collapse strength of submarine pressure hulls. Seven ring-stiffened cylinders have been machined from 6082-F28 aluminium alloy tubing and tested to collapse under external hydrostatic pressure. Four of the cylinders had discrete patches of artificial corrosion, which was introduced by machining away between 15 and 27% of the shell thickness on the outside of the specimens. All seven cylinders failed by overall collapse. The collapse pressures of the corroded models were between 12 and 22% less than for similar intact models. The current results have been compared with similar previously tested models that were fabricated from 6082-T6 aluminium alloy, which has a yield stress between 25 and 75% greater than the F28 material. The results from the current and previous testing phases have been compiled in order to determine trends related to the effect of material properties and corrosion on overall collapse. The relationship between yield stress and overall collapse pressure was found to be approximately linear in the range of yield stresses considered, so that a 10% increase in yield stress results in a 8-9% increase in collapse pressure, and vice versa. The loss of overall collapse strength, in percentage terms, due to corrosion was found to be slightly less severe than previous estimates, but still on the order of the shell thinning.

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Report Number
DRDC-ATLANTIC-TM-2009-299 — Technical Memorandum
Date of publication
01 May 2010
Number of Pages
216
DSTKIM No
CA034830
CANDIS No
534414
Format(s):
Electronic Document(PDF)

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