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High-strength steel sheets have been applied to automotive components to reduce car weight while ensuring collision resistance and fatigue endurance. However, the shear edge properties of high-strength steels deteriorate due to surface cracks that develop in the fractured area of the shear edge. In experimental and simulated tensile testes, Dalloz et al.1) demonstrated that surface cracks of this type lowered the ductility of dual-phase steels because the crack area deformed preferentially. Shih et al.2) called these surface cracks “3-D formations” and related the cracks to degeneration of hole expanding formability caused by the high roughness of the shear edge. Regarding the fatigue property of punched holes of high-strength steels, the roughness of the shear edge, including surface cracks, is a negative influencing factor on fatigue strength in addition to the residual stress of the punched edge.3,4) The surface cracks are often rejected as appearance defects. This is because the surface cracks vary in size and it is difficult to predict the influence of the surface cracks on the shear edge properties. Although surface cracks affect the formability, performance, and appearance quality of automotive components in which high-strength steel sheets are used, the surface Modeling of Surface Crack Defects Developed on Shear Edge in High-strength Automotive Steel Sheets