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RESEARCH PAPERS

Comparison of Theoretical Estimates and Experimental Measurements of Fatigue Crack Growth Under Severe Thermal Shock Conditions—Part II: Theoretical Assessment and Comparison With Experiment

[+] Author and Article Information
D. Green

United Kingdom Atomic Energy Authority, Risley, England

R. Parker

National Nuclear Corporation Ltd., Risley, England

D. Marsh

Springfield Nuclear Laboratories, United Kingdom Atomic Energy Authority, Preston, England

J. Pressure Vessel Technol 109(4), 421-427 (Nov 01, 1987) (7 pages) doi:10.1115/1.3264925 History: Received July 20, 1987; Online November 05, 2009

Abstract

This paper reports the theoretical assessment of cracking which may occur when a severe cycle comprising alternate upshocks and downshocks is applied to an axisymmetric feature with an internal, partial penetration weld and crevice. The experimental observations of cracking are reported separately. A good agreement was noted even though extensive cycle plasticity occurred at the location of cracking. It is concluded that the LEFM solution has correlated with the experiment mainly because of the axisymmetric geometry which allows a large hydrostatic stress to exist at the internal weld crevice end. Thus the stress at the crevice can approach the singular solution required for LEFM correlations without contributing to yielding.

Copyright © 1987 by ASME
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