인스트루먼트 패널의 온도에 따른 Creep 및 인장 특성에 관한 연구

Vehicle interior parts composed of plastic usually deform under various temperature condition. The varying temperature induces thermal expansion of IP. The incompatibility of thermal expansion between various parts causes permanent deformation of plastic parts in conjunction with constraint conditions. Therefore, it is one of the key issue to minimize thermal deformation during developing IP. It is necessary to obtain the material properties for thermal deformation analysis under the heat cycle test. Specially, creep data of plastic material was introduced to study the time-dependent deformation behavior of the instrument panel in heat cycle test. The test has been fitted into a time-hardening type creep constitutive equation. The time-hardening version of the power-law creep model was applied to account for the permanent deformation after heat cycle test, verified through the comparison of test result with FEA result for simple model.