Abstract: A region for which nonlinear analysis should be carried out is extracted and welding deformation of only the extracted region is computed by nonlinear analysis. Specifically, 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 when 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.

Abstract: A finite element analysis method, finite element analysis device, and computer program through which the computation load is reduced and the computation time is shortened to a minimum value without increasing the computation time exponentially even if the shape of a structure is complex. Each finite element is divided into regions. The displacement value and the stress value are computed for each region, and a maximum value of the differences in stress value between the regions. When the computed maximum value is larger than a predetermined value, each of the regions is divided into regions. For each region, iterative computation is carried out to compute a maximum value of the differences in stress value between the regions. If the number of divisions does not reach a predetermined limit value, each region is further divided into regions, and a maximum value of the differences in stress value between the regions is computed iteratively for each region.

Abstract: A region for which nonlinear analysis should be carried out is extracted and welding deformation of only the extracted region is computed by nonlinear analysis. Specifically, 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 when 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.