激光点焊接头力学性能与失效数值模拟研究  

Numerical simulation study on the mechanical properties and failure of laser spot welding join

作　　者：郑帮智 田晓琳 王泽龙 冯兆龙 Zheng Bangzhi;Tian Xiaolin;Wang Zelong;Feng Zhaolong(State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization,Panzhihua 617000,Sichuan,China;Chengdu Advanced Metal Materials Industry Technology Research Institute Co.,Ltd.,Chengdu 610300,Sichuan,China)

机构地区：[1]钒钛资源综合利用国家重点实验室,四川攀枝花617000 [2]成都先进金属材料产业技术研究院股份有限公司,四川成都610300

出　　处：《钢铁钒钛》2024年第1期165-170,共6页Iron Steel Vanadium Titanium

摘　　要：测试了三种形状的激光焊点在拉伸、剪切、剥离工况下的静态和动态力学性能,分析了点焊焊缝的显微组织特性和硬度分布情况。结果表明,焊点形状与焊点力学性能密切相关,C型焊点整体性能更优;焊点强度随加载速率的增加而发生塑性强化,加载速率越大,塑性强化越明显;焊缝整体分布均匀,过度平滑,融合区和热影响区硬度高。基于LS-DYNA焊核合力失效准则,研究了激光点焊接头失效数值仿真方法,明确了等效焊核直径用于模拟激光点焊失效方法的有效性。The static and dynamic mechanical properties of three kinds of laser welded joints under tensile,shearing and peeling conditions were tested,and the microstructure characteristics and hardness distribution of the spot welded joints were analyzed.The results show that the shape of solder joints is closely related to their mechanical properties,and the overall properties of C-type solder joints are better.The strength of solder joints is plastically strengthened by the increase in loading rate,and the greater the loading rate,the more obvious the plastic strengthening is.The overall distribution of welding seam is uniform and excessively smooth,while the hardness of fusion zone and heat affected zone is high.Based on the LS-DYNA failure criterion,the numerical simulation method of laser spot welding joint failure is studied,and the effectiveness of equivalent core diameter used to simulate laser spot welding failure is clarified.

关 键 词：汽车板 激光点焊 力学性能 焊点失效 数值仿真 

分 类 号：TG456.7[金属学及工艺—焊接]