Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 40, Issue -, Pages 120-128Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2011.12.016
Keywords
Load-carrying cruciform joints; Low- and high-cycle fatigue; Strength mismatching; Failure pattern; Effective notch
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This study examined the applicability of the effective notch concept to the low- and high-cycle fatigue regions for load-carrying cruciform joints. Low- and high-cycle fatigue tests were performed on specimens with various strength matching conditions and incomplete penetration ratio. Fatigue test results revealed that the effect of strength matching becomes obvious in low cycle fatigue region, while, it was negligible in high cycle fatigue region. Different failure patterns can be observed for specimen with different strength mismatching condition in the low cycle fatigue tests. Elasto-plastic finite element analyses were performed under the same conditions as the experiments. The effective notch strains were determined at the crack initiation points. A unique relationship between effective notch strain and fatigue life was obtained regardless of matching condition and incomplete penetration ratio. (C) 2011 Elsevier Ltd. All rights reserved.
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