SYMPOSIA PAPER Published: 01 January 1979
STP35849S

A Procedure for Incorporating Thermal and Residual Stresses into the Concept of a Failure Assessment Diagram

Source

The Failure Assessment Curve proposed by Harrison, Loosemore, and Milne has been rederived and interpreted in terms of an equivalent J-integral analysis. Comparison with computed values of J indicates that the curve is a good approximation to a lower-bound failure criterion for mechanical loading. The J-integral interpretation enables thermal, residual, and secondary stresses to be included within the concepts of the Failure Assessment Diagram. A procedure is introduced which transforms points on a failure diagram obtained, for instance, from a J-integral analysis, into approximately equivalent points on the Failure Assessment Diagram. This procedure is particularly useful for failure assessments involving thermal, residual, or secondary stresses where a plastic collapse parameter is not definable. The procedure assumes that a plastic stress intensity factor can be estimated. A method of assessing the severity of a mechanical load superposed on an initial constant load is also presented. Examples showing the applications and advantages of the technique are given.

Author Information

Chell, GG
Central Electricity Research Laboratories, Leatherhead, Surrey, U. K.
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Details
Developed by Committee: E08
Pages: 581–605
DOI: 10.1520/STP35849S
ISBN-EB: 978-0-8031-4739-3
ISBN-13: 978-0-8031-0330-6