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Stress analysis on Canadian naval platforms using a portable miniature X-ray diffractometer

Published online by Cambridge University Press:  29 February 2012

S. P. Farrell ,
L. W. MacGregor  and
J. F. Porter
S. P. Farrell*
Affiliation:
Dockyard Laboratory (Atlantic), Defence Research and Development Canada–Atlantic, 9 Grove St., Dartmouth, Nova Scotia B2Y 3Z7, Canada
L. W. MacGregor
Affiliation:
Dockyard Laboratory (Atlantic), Defence Research and Development Canada–Atlantic, 9 Grove St., Dartmouth, Nova Scotia B2Y 3Z7, Canada
J. F. Porter
Affiliation:
Dockyard Laboratory (Atlantic), Defence Research and Development Canada–Atlantic, 9 Grove St., Dartmouth, Nova Scotia B2Y 3Z7, Canada
*
Author to whom correspondence should be addressed. Electronic mail: shannon.farrell@drdc-rddc.gc.ca
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Abstract

Strain field distribution in a naval platform under dry-dock conditions is complex and represents the cumulative response from residual stress (“locked in” during fabrication of materials and formation of the structure) and static loading stress (e.g., dry-dock loading). The magnitude and distribution of stress fields are a significant concern for the Canadian Navy, where the superposition of applied stresses on residual stresses may adversely affect the performance, safe operational envelope, and service life of naval platforms. Stress analysis was conducted on Canada’s VICTORIA Class submarines using a portable miniature X-ray diffractometer (mXRD) under dry-dock conditions. This paper introduces the concept of “residential stress” as it applies to submarine platforms and discusses the methodology for performing stress analysis with a portable mXRD. The evolution of residential stress during routine pressure hull repairs to Canada’s VICTORIA Class submarines is discussed. In particular, the recent replacement of the diesel exhaust hull and back-up valves on one of the submarines, as well as a pressure hull plate extraction-insertion-weld procedure on another, is discussed.

Keywords

submarinepressure hullresidential stressresidual stressapplied stressX-ray diffractionnondestructive inspectionX-ray elastic constant
Type
Technical Articles
Information
Powder Diffraction , Volume 25 , Issue 2 , June 2010 , pp. 119 - 124
Copyright
Copyright © Cambridge University Press 2010

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