차체 외판의 면요철 해석 = Analysis of Surface Deflection in the Automotive Skin Panel

다국어 초록 (Multilingual Abstract)

Surface deflection is defined as a wrinkle with height lower than 0.2mm, and generally occurs where shape change is large. Surface deflection around the door handle is generally as small as tens of microns in height, but it results in shadows due to light deflection, which deteriorates car quality in terms of appearance. In this study, simulation of surface deflection has been conducted using PAM-STAMP, and applied to a front door of a pre-production model. In order to obtain higher accuracy of the simulation, meshes have been carefully aligned along the feature line of the door handle. Importance of the mesh alignment has been shown clearly with a U-bending test. The simulation result has shown clear pattern of surface deflection, which was in good accordance with the pattern experimentally obtained. Simulations of three different forming processes have been conducted using a simplified model to find how to reduce surface deflection.