Patent ID: 7379780

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, a representative material determining portion that determines a material positioned in a position that is predefined in each of the plurality of the small regions as a material that represents each of the plurality of the small regions, a material constant selection portion that selects the material constant of the material that represents the respective small regions from the material constant data, and a combining portion that calculates an equivalent material constant for a region in which a plurality of the small regions that are adjacent are combined with respect to at least one direction, by combining the material constant of the representative material of the plurality of adjacent small regions in at least one direction.