Fatigue crack shapes development of plate-to-plate welded joints |
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Authors: | S T Lie S P Chiew Z Xiang Z Cen |
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Institution: | (1) School of Civil & Structural Engineering, Nanyang Technological University, Nanyang Avenue, 639798, Singapore;(2) Department of Engineering Mechanics, Tsinghua University, 100084 Beijing, P.R. China |
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Abstract: | This paper presents crack shapes development of 3D surface semielliptical cracks which are always found at the weld toe of
non-load-carrying cruciform welded joints. The alternating current potential drop technique has been used to measure the eight
crack depths along the weld toe where probes are placed at 10-mm intervals. 3D crack shapes can be obtained at any particular
cycle during the fatigue test. Subregion boundary element methods incorporating the transition and quarter-point elements
along the crack front are used to validate the experimental stress intensity factors along the crack front. A method for evaluating
the effective stress intensity factors is proposed. It is found that the numerical results generally agree with the experimental
results. |
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Keywords: | Semielliptical crack alternating current potential drop boundary element method effective stress intensity factors |
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