車体衝突時の鋼板エッジ破断簡易評価手法の開発(第1報)

概要

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In the vehicle collisions, fractures can be occurred from the edge of steel sheet parts. And the existence or nonexistence of the fracture has the influence on the accuracy of the vehicle crash simulations. It is known that the fracture limit on the edge of steel sheet is much affected by the edge processing conditions and their theoretical prediction is difficult. In order to obtain the simple prediction index of fracture limit from the edge of steel sheets, the fracture limits of holes of rectangular specimen processed using several methods were measured by tensile tests. It was examined which mechanical properties of standardized tests were influenced to the limits using multiple regression analysis. And it was clarified that these fracture limits are represented by the combination of the elongation and hole-expansion ratio of steel sheet.