无铆钉自冲铆接有限元简化模型建模方法研究  

Study of simplified finite element modeling technique for mechanical clinching joints

作　　者：周璐瑶[1] 吕婕[1] 陆善彬[1] 叶辉[1] 

机构地区：[1]吉林大学汽车工程学院,吉林长春130025

出　　处：《锻压技术》2014年第5期126-131,共6页Forging & Stamping Technology

基　　金：国家自然科学基金资助项目(51105166)

摘　　要：无铆钉自冲铆接被广泛用于异种材料的连接,其失效形式对整车的碰撞性能至关重要。本文对钢铝异种材料无铆钉自冲铆接接头简化有限元模型的建模方法进行了一定的研究。在准静态条件下,分别采用梁单元、实体单元和约束单元(SPR2模型)作为铆接简化有限元模型,进行十字拉伸和搭接剪切试验的仿真分析。结果表明:在十字拉伸工况下,SPR2模型结果的载荷值相比试验稍偏弱,但整体与试验值较符合;在搭接剪切工况下,梁单元无法模拟韧性失效模式,实体单元和SPR2模型均能模拟出韧性失效模式。考虑到实体单元建模复杂,SPR2模型作为铆接简化有限元模型较为理想。在动态加载试验中,对SPR2模型展开进一步研究。SPR2模型在动态十字拉伸试验中跟静态一样可以准确模拟出失效点,同时在动态搭接剪切试验中对失效点的预测比静态更为准确。Mechanical clinching joint is widely used in connecting dissimilar materials, whose failure behavior is critical to whole vehicle crashworthiness. The study on modeling of mechanical clinching joints of aluminum alloy and steel was carried out. Beam elements, solid elements and constrained element （ SPR2 model） were used as simplified mechanical clinching joint model to simulate quasi-static cross- tension and lap-shear tests. According to simulation results, SPR2 model shows a lower force value in cross-tension, while corresponds to test result well in all. Solid element and SPR2 model can simulate ductile failure mode instead of beam element in lap-shear. Considering complex modeling of solid element, SPR2 model could be used as ideal simplified mechanical clinching joint model. Further study of SPR2 model was carried out to simulate mechanical clinching joint in dynamic loading tests. SPR2 model could predict failure onset in dynamic cross-tension test as well as in quasi-static, in addition, dynamic simulation has a better result contrasting to quasi-static in lap-shear test.

关 键 词：无铆钉自冲铆接 简化模型 SPR2模型 失效 

分 类 号：TG938[金属学及工艺—钳工工艺]