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A Study on the Fatigue Life Estimation Using Butt Weld Bead Profiles  

김재훈 (한국철도기술연구원)
구병춘 (한국철도기술연구원)
Publication Information
Journal of the Korean Society for Railway / v.7, no.2, 2004 , pp. 125-129 More about this Journal
Abstract
This study investigates the fatigue lift estimation of butt weld specimen for the railway vehicle by examining butt weld bead profiles. The butt weld beads, which are welded by semi-robot method, have non-uniform bead profiles described by $\theta$, p and h. The stress concentration factors, K$\_$t/, are changed by different $\theta$, p and h from 1.395 to 2.863. Hence, the sensitivity of K$\_$k/ is changed by each $\theta$, p and h. As $\theta$ becomes lower and p and h become higher, K$\_$t/ increases. The fatigue life can be estimated very closely for the AAY specimens without residual stress using only butt weld bead profiles. But, for the AAN specimens with residual stress, the fatigue life must be estimated by considering both the weld bead profiles and the residual stress data.
Keywords
Fatigue; Stress concentration factor; Fatigue notch factor; Weld bead profile;
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  • Reference
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