PROBLEM TO BE SOLVED: To perform easily and accurately quantitative evaluation of brittle fracture, concerning a member made of a thin steel sheet used for an automobile body or the like.SOLUTION: Evaluation items (absorption energy, a percent brittle fracture and the like) of brittle fracture of a thin steel sheet member are inputted, and a stress distortion state (stress triaxiality or the like) in the case where a load or displacement is applied onto the member is calculated on reference to fracture characteristic data of the thin steel sheet related to the evaluation items, and a brittle fracture characteristic of the member is calculated from the fracture characteristic data and the stress distortion state.SELECTED DRAWING: Figure 1
