Patent ID: 7957918

Claim:
A member designing method comprising: a first step where a computer performs press forming analysis based on a shape of a formed product or a shape of a member, a blank holder force, a friction coefficient, a tensile strength of a material, a yield strength, a stress-strain relation, and a sheet thickness, as press forming conditions, to calculate sheet thickness distribution and post-formation strain distribution of the formed product, said member comprising one or more formed products finished and assembled; and a second step where the computer performs performance analysis based on the sheet thickness distribution, the post-formation strain distribution, and the shape of the formed product or the shape of the member, as state amounts of the formed product, to calculate performance of the member, wherein the computer repeats the calculations performed in the process from said first step through said second step a predetermined number of times, with at least one of the press forming conditions being changed, to output an optimum press forming condition that gives a maximum value or a target value of the performance.