As shown in
FIG. 9, the processing of Step S
6 is performed on a three-dimensional model (analytical model) of a structure built in a virtual three-dimensional space. The analytical model is constituted by arranging a plurality of three-dimensional elements (a tetrahedron, a hexahedron, or the like). Herein, the calculation point is placed at the center point of the three-dimensional element. In
FIG. 9, at the respective calculation points a to e on the analysis surface
501, inherent strain estimated values are given. A case where the inherent strain is transferred to a transfer surface
502 spaced from the analysis surface
501 by θ around a z axis which is the rotation center is considered. The CPU
111 transfers the respective estimated inherent strain values at the calculation points a to e to calculation points a′ to e′ corresponding to the calculation points a to e on the transfer surface. That is, the inherent strain values at the calculation points a′ to e′ are the same as the respective inherent strain values at the calculation points a to e. The CPU
111 performs such processing over the transfer range (in a case of the journal shaft, in a range of 360°, and in a case of the pin shaft, in a range of 180°).