自動車車体衝突時には,鋼板製の部品のエッジを起点にして破断が発生する場合がある.また破断の発生の有無は,車体衝突シミュレーションの精度に影響を与える.鋼板エッジの破断限界はエッジの加工条件によって大きく変化することが知られており,それらの理論的な予測は困難である.鋼板エッジから発生する破断の限界値の簡易的な評価指標を得るために,数種類の方法で加工した穴を有する試験片の引張試験を行うことで,穴縁の破断限界を測定した.重回帰分析を使用することで,汎用的な材料試験で得られる機械的特性のうち,どの因子が限界値に影響を及ぼすのかについて調査した.結果として,これらの破断限界は鋼板の伸びと限界穴拡げ率を組み合わせた指標によって表すことができた. ; 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.