ドアエンボス部の面ひずみにおよぼす材料特性の影響

抄録

Surface deflection is caused by a small local out-of-plane displacement on exterior automotive body panels, such as the handle portion of door panels and the fuel filler lid mounting area of side outer panels. Surface deflection is influenced by many factors, such as punch geometry, material properties, sheet thickness, and forming conditions. In this study, surface deflection is investigated by press forming experiments and their numerical simulations of the exterior door panel model. Emphasis is placed on the effects of mechanical properties on surface deflection, and the mechanisms of surface deflection are discussed. It is revealed that the nonuniform distribution of stress around the handle portion during press forming causes surface deflection. Yield strength, plastic anisotropy and Bauschinger effect have significant effects on surface deflection.