FATIGUE LIFE ESTIMATION DEVICE OF WELDED STRUCTURE, FATIGUE LIFE ESTIMATION METHOD OF WELDED STRUCTURE, AND COMPUTER PROGRAM

摘要

PROBLEM TO BE SOLVED: To calculate comparatively simply and highly accurately a fatigue life of a welded structure on which a fluctuation amplitude load works.;SOLUTION: Finite element analysis by a shell model is performed, and a uniform stress component and a bending stress component at a fatigue life evaluation part 23 of a longitudinal face 21 are determined. A stress distribution corresponding to a welded joint form is extracted from a database, and the uniform stress component, the bending stress component, and a shape parameter of a member and a weld bead are input into the stress distribution, and a stress distribution of a plate thickness cross section 41 of the longitudinal face 21 is calculated. A residual stress distribution corresponding to the welded joint form and a weld toe processing condition is extracted from the database, and the shape parameter of the member and the weld bead, a material property and a weld condition are input into the residual stress distribution, and a residual stress distribution of the plate thickness cross section 41 of the longitudinal face 21 is calculated. A fatigue crack propagation lifetime at the fatigue life evaluation part 23 is calculated by using the stress distribution and the residual stress distribution of the plate thickness cross section 41 of the longitudinal face 21.;COPYRIGHT: (C)2010,JPO&INPIT