Effects of microstructure and specimen thickness on the fatigue crack closure in Al-Li 8090 alloy

Rhyim, Young-Mok; Lee, Y.J.; Chang, Young Won; Lee, C.S.

doi:10.1016/0956-716x(94)00021-9

Cited by 6 publications

(1 citation statement)

References 10 publications

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“…Reducing the dimensions of a FCP specimen may have one or more of the following effects: (1) decreased length between the gripping/loading points may disrupt the similitude of the stress field between the subsized and standard specimens; (2) reduction in width may make the crack tip plastic zone extend across the whole remaining ligament sooner, thus increasing the crack growth rates; (3) reduction in thickness may change the stress state and alter the degree of crack closure [5][6][7][8]. A close examination reveals that the miniature specimen growth rates typically differ with the standard specimen results by a factor of ~2 to 4 [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

A Critique on Evaluating Fatigue Crack Propagation Properties Using Miniature Specimens

Shin

Lin

2010

AMR

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There are situations where baseline fatigue crack propagation (FCP) data are needed but the available material for its evaluation is far from enough to fabricate full sized standard specimens. Miniature specimen testing techniques have been proposed but published data seems to be slightly but consistently slower under the same stress intensity than that from standard specimen results. In this work, an aluminum alloy and a steel, which have vastly different mechanical behaviors, are used to generate different stress states and premature crack closure to allow the validity of miniature specimen FCP data to be critically examined.

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