Weld root crack propagation under mixed mode I and III cyclic loading |
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Authors: | In-Tae Kim |
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Affiliation: | Department of Geotechnical and Environmental Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan |
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Abstract: | This study examined fatigue propagation behaviour and fatigue life of weld root cracks under mixed mode I and III loading. Fatigue tests were performed on butt-welded joints with a continuous lack-of-penetration (LOP) inclined at angles of 0°, 15°, 30° or 45° to the normal direction of the uniaxial cyclic load. Branch and/or co-planar crack propagation was observed, depending on the initial mode I stress intensity factor (SIF) range. Co-planar crack propagation predominated when the SIF range was large. The fatigue crack propagation mode affected fatigue life; the life of branch crack propagation was longer than that of co-planar crack propagation. Using an initial equivalent SIF range based on a maximum strain energy release rate criterion, the results obtained from the 0°, 15°, 30°, and 45° specimens indicated almost the same fatigue lives, despite the different inclination angles. |
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Keywords: | Fatigue test Mixed mode I and III loading Weld root crack Fatigue crack propagation |
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