| [연구논문] Mk-계수를 고려한 용접부 복수 표면균열 진전수명 평가 |
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| Fatigue Life Estimation of Welded Joints by using Mk-factor under a Propagation Mechanism of Multiple Collinear Surface Cracks |
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Seung-Ho Han, Jeong-Woo Han, Byung-Chun Shin, Jae-Hoon Kim |
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| Abstract |
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Failure mechanisms of welded joints under fatigue loads are interpreted that multiple collinear surtace cracks initiating randomly along the weld toes propagate under the mutual interaction and coalescence of adjacent two cracks. To estimate fatigue crack propagation life for three types of the representative welded joints, i.e. non-load carrying cruciform, cover plate and longitudinal stiffener joint, the stress intensity factors at the front of the surface cracks have to be calculated, which are influenced strongly by the geometry of attachments, weld toes and the crack shapes. For the effective calculation of the stress intensity factors the Mk-tactor was introduced which can be derived by a parametric study performed by FEM considering influence of the geometrical etfects. The fatigue life of the cruciform joint was estimated by using the Mk-factors and the method considering the propagation mechanisms of the multiple surface cracks. Analysis results for the fatigue life had a good agreement with that of experiment. |
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