JSME International Journal Series A Solid Mechanics and Material Engineering
Online ISSN : 1347-5363
Print ISSN : 1344-7912
ISSN-L : 1344-7912
Damage & Fracture
A Modified Wheeler Model to Improve Predictions of Crack Growth Following a Single Overload
Pey-Shiuan SONGBor-Chiou SHEULi CHANG
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2001 Volume 44 Issue 1 Pages 117-122

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Abstract

This paper modifies the Wheeler retardation concept to improve the accuracy of crack growth predictions after a single overload. This modification is primarily based on the number of delay cycles, Nd, and on the overload affected crack length, ad. Nd is used to calibrate the Wheeler exponent, m, and ad is employed to assess the effective overload plastic zone size. In addition, the regression equations for m and ad are established in terms of the overload ratio OLR. The modified Wheeler model together with these equations performed well in reproduction of the actual crack growth behavior in 5083-O aluminum alloy. All predictions of the number of delay cycles were within a factor of 1.1 of the experimental observations.

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© 2001 by The Japan Society of Mechanical Engineers
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