Digital Repository, ICF12, Ottawa 2009

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Stress intensity factors of a crack emanating from a cold expanded hole : Effects of edge distance ratio
M. Arian Nik, M.R. Ayatollahi

Last modified: 2013-05-07


Cold expansion method has beneficial effects on extending the fatigue life ofstructures containing holes. However, for holes located near the plate edge, thereis concern about the residual stress distribution around the hole that associatedwith beneficial effect of cold expansion process. The purpose of this study is toinvestigate the influence of edge distance ratio (EDR) on the stress intensityfactors of a crack emanating from a cold expanded hole, where EDR is edgedistance/hole diameter (or e/D). A 2-D finite element simulation was carried outwith various degrees of cold expansion and various EDRs. It was found that thereduction of EDR below e/D=3 has significant effect on the tangentialcompressive residual stress zone. Furthermore, for a crack considered in theligament, a significant reduction in the stress intensity factors was found in a coldexpanded hole for both small and large EDRs.

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