The Effect of Creep and Stress Relaxation on Automotive Lighting

蠕变与应力松弛对车灯产品的影响

The Effect of Creep and Stress Relaxation on Automotive Lighting

张海全 Christine ROUCOULES 杨波 李吉

摘要：车灯产品各部件主要由塑料材料制造而成。塑料是高分子化合物，具有抗腐蚀能力强，质轻，成本低，高绝缘等优点。但在高温环境下，塑料会有较明显的蠕变和应力松弛效应。车灯产品需要通过各种高温环境下的测试条件，蠕变和应力松弛将会导致诸如永久变形或者螺栓锁紧力降低等问题，从而影响产品的可靠性。在车灯产品设计初期，研究材料蠕变及应力松弛效应，并通过CAE仿真技术手段指导前期设计，具有积极的意义

关键字：蠕变；应力松弛；塑料；仿真；变形；锁紧力

Abstract: Plastics materials are widely used in the automotive lighting industry. Plastics have advantages, for example, resistance to corrosion, lightweight, low cost, high insulation and so on. But under a high temperature environment, plastics may have an obvious creep and stress relaxation effect. Such effects can cause permanent deformation or reduction of bolt pretension force as high temperature environmental tests need to be conducted for automotive lighting products. In early design phase of products, if these effects are considered with CAE simulation, products robust can be improved and cost can be reduced in the product development

Key words: Creep, Stress relaxation, Plastics, Simulation, Deformation, Bolt pretension