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发表时间：2019-01-01

发表刊物：船舶力学

所属单位：运载工程与力学学部

卷号：23

期号：12

页面范围：1475-1485

ISSN号：1007-7294

摘要：A strain energy density method based on Notch Stress Intensity Factors (NSIF) to assess fa?tigue strength of welded joints is presented. This method simply treats welded joints as V-shaped notches. The stress field close to the notch tip is singular and related to the notch opening angle. The stress distribution of the notch tip can be described by the NSIF. The calculation of the NSIF needs re?fined mesh, and two calculated NSIFs of different notch opening angles cannot be compared with each other directly. Based on the NSIF, the strain energy density in a sector of critical radius R is studied. It is validated that the method presented in this paper is independent of mesh sizes and contains the ef?fect of local welding parameters of the welded joints. The method can accurately describe the stress distribution in the highly stressed zones located at the weld toes, and can be used in engineering to as?sess the fatigue strength of welded joints.

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