实体单元焊点模型在前纵梁碰撞仿真中的应用  

Application of spot weld model using solid element in simulation of front longitudinal beam crash

作　　者：杨济匡[1] 叶映台[1] 彭倩[1] 吴沈荣[2] 郭杰[2] 

机构地区：[1]湖南大学汽车车身先进设计制造国家重点实验室,长沙410082 [2]奇瑞汽车股份有限公司乘用车工程研究二院,安徽芜湖241009

出　　处：《吉林大学学报（工学版）》2011年第6期1542-1548,共7页Journal of Jilin University:Engineering and Technology Edition

基　　金：'863'国家高技术研究发展计划项目(2006AA110101);教育部;国家外专局'111计划'项目(111-2-11);湖南大学汽车车身先进设计制造国家重点实验室自主研究项目(60870004)

摘　　要：为了提高碰撞仿真中汽车前纵梁焊点的模拟精度,应用LS-DYNA软件,建立了壳单元模拟母材、单个实体单元模拟焊核和热影响区的焊点模型。母材材料特性及焊点失效参数分别通过板材拉伸试验及焊点杯形拉伸试验获得。采用数值KSⅡ试验对该焊点模型在母材网格不同偏置情况下的内力进行了研究。基于经验证的纵梁有限元模型对前纵梁碰撞进行了仿真,其有限元模型中分别应用了实体单元和梁单元。仿真结果与滑车试验结果就焊点的失效情况、纵梁的变形和滑车加速度等进行了比较。研究表明,用实体单元的焊点模型优于梁单元模型,结果可靠,精度高。In order to improve the simulation accuracy of the weld spot of the front longitudinal beam in the vehicle crash simulation,a spot weld model using the shell element to simulate the parent material and the single solid element to simulate the weld nugget and its heat affected zone was built by means of the software LS-DYNA.The properties of the parent material and the failure parameters of the weld spot were acquired by tensile tests of the sheet and the weld spot cup respectively.The internal force of the spot weld model was investigated by the numerical KSII tests in various parent material mesh configurations.The simulations of the front longitudinal beam crash were performed by a validated finite element model of the longitudinal beam using spot weld models with sodid element and beam element respectively.The simulation results were compared with the sled test results in terms of the failure behavior of the spot weld,the deformation of the longitudinal beam and the acceleration of the sled.The study indicated that the spot weld model with solid element is better than that with beam element for better reliability and higher accuracy.

关 键 词：车辆工程 焊点模型 有限元 碰撞仿真 实体单元 前纵梁 

分 类 号：U461.91[机械工程—车辆工程]