Patent ID: 7548792

Claim:
An equivalent material constant calculation system that calculates an equivalent material constant of a structure constituted by a plurality of materials, comprising: a shape data input portion that inputs shape data that expresses the shape of each material constituting the structure, a material data input portion that inputs material constant data that expresses a material constant of at least one of the materials constituting the structure, a dividing portion that divides the structure into a plurality of small regions, and a small region interior calculation portion that calculates equivalent material constants in the small regions, wherein the small region interior calculation portion expresses, based on the shape data and material constant data, an equivalent material constant for a region that is part of a small region with a function that includes a value in a variable that expresses a position in at least one direction in the small regions, and calculates equivalent material constants in the small region with respect to the at least one direction using the function, and wherein the small region interior calculation portion comprises: a boundary function generating portion that sets a coordinate in the direction of one coordinate axis to u in an orthogonal coordinate system that has been set for the structure and generates, based on the shape data, a boundary function F(u) that expresses a boundary between the materials in a small region, a section setting portion that sets one or more sections for u in the small region according to a domain of the boundary function F(u), a section interior calculation portion that creates, in the section, based on the function F(u) and the material constant data, a function that expresses a position where the material constant is applied, and obtains an equivalent material constant of the coordinate axis direction in the section by integrating the function in the section, and an equivalent material constant generating portion that, based on a section equivalent material constant of each section obtained by the section interior calculation portion, obtains an equivalent material constant of the coordinate axis direction in the small region.