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http://dx.doi.org/10.3795/KSME-A.2004.28.10.1549

Fatigue Life Estimation of Cruciform Welded Joint Considering Multiple Collinear Surface Cracks  

Han Seung Ho (한국기계연구원 구조연구부)
Shin Byung Chun (한국기계연구원 구조연구부)
Kim Jae Hoon (충남대학교 기계설계공학과)
Han Jeong Woo (한국기계연구원 구조연구부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.28, no.10, 2004 , pp. 1549-1557 More about this Journal
Abstract
Fatigue life of welded joints is governed by the propagation of multiple collinear surface cracks distributed randomly along weld toe. These cracks propagate under the mechanisms of mutual interaction and coalescence of the adjacent two cracks. To estimate the fatigue life, its influences on the above two mechanisms should be taken into account, which appear through the stress intensity factors disturbed mutually. However, it is difficult to calculate the stress intensity factors of the multiple surface cracks located in vicinity of weld toe due to its geometrical complexity. They are calculated normally by using the Μk-factors, but such Mk-factors are very rare in literature. In this study, the Μ$textsc{k}$-factors were obtained from a parametric study on crack length and depth, for which a finite element method is used. A fatigue test for a cruciform welded Joint was conducted and the fatigue life of the tested specimen was estimated using the present method with the informations obtained from the test, such as the number, size, and locations of the cracks. The estimated and measured fatigue life showed a good agreement.
Keywords
Fatigue Life; Multiple Surface Crack; Mutual Interaction; Coalescence; Cruciform Welded Joint;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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