On Automotive Body Closure Panel Dent Resistance 2003-01-2856
The definitions and evaluation methods used to determine dent resistance for automotive closure panels are reviewed. Although dent resistance is required under both static and dynamic loading conditions, dynamic dent resistance is emphasized because the basic definitions and methods for evaluating dynamic denting are still not well established. In order to design automotive body panels to resist denting, a fundamental understanding of the interaction between the evaluation method and the material's, mechanical, and panel's geometric parameters is required. Currently there is no standard for indenter type, speed, or indenter material to be utilized or on the basic definition of “acceptable” dent resistance. The interpretation of results is dependent on these parameters. Predictive methodologies using the finite element method are reviewed. Technical challenges in developing a quantitative measure of dent resistance are highlighted.