WELDING DEFORMATION COMPUTING METHOD, WELDING DEFORMATION COMPUTING DEVICE, COMPUTER PROGRAM, AND RECORDING MEDIUM

摘要

A welding deformation computing method for computing welding deformation in a relatively short time while maintaining high deducing accuracy of the welding deformation by carrying out convergence computation in such a way that nonlinear analysis of only the portion near a welded portion is carried out to maintain continuity with the linear analysis result, a welding deformation computing device, a computer program, and a recording medium. A limit surface representing a limit of a region for which nonlinear analysis is necessary at a predetermined time point is determined in reference to the stress distribution and the temperature distribution, the region for which nonlinear analysis is necessary is extracted, the displacement and reaction force at the limit surface are computed by linear analysis of the object to be welded, the reaction force at the limit surface is computed by nonlinear analysis of the region for which nonlinear analysis is necessary, an amount of correction of the displacement at the limit surface is computed and the above processing is repeated if it is judged that a difference between the two reaction forces is larger than a predetermined value, and welding deformation of the object to be welded is computed based on the computed displacement if it is judged that the difference between the reaction forces is smaller than the predetermined value.