摘要
研究了汽车前纵梁碰撞有限元分析中焊点的5种建模方式对仿真精度的影响。这5种焊点建模方法:刚性化节点模型、无质量刚性杆模型、可变形梁单元模型、实体单元模型和弹簧单元模型。在Ls-Dyna通用非线性动力学软件平台上,建立对应的焊点模型,根据某前纵梁台车碰撞实验,对比分析这5种方法在模拟焊点失效响应、前纵梁的动态响应、建模的难度,点焊模拟连接、载荷力的优点和不足。结果表明:能否模拟失效对仿真精度有较大影响,在前纵梁碰撞模拟计算中模拟精度较高的焊点模型依次为:实体单元模型、可变形梁单元模型和弹簧单元模型。
A corresponding crash finite element（FE） model was developed to study the influence of spotweld models in longitudinal beam crash and the simulation accuracy.The model uses the Ls-Dyna software with five types of spotweld models,including the rigid bar,spotweld,beam,spring,and solid element models,in the crash of a certain longitudinal beam jointed by spotwelds.With a real world test comparison,this paper analyzes the failure of spotweld,the deformation of longitudinal beam,the difficulty of modeling,and the advantages and disadvantages of modeling the connecting and loading.The results show that the failure of spotwelds affects the carsh simulation precision,and that the solid element model,deformable beam model and spring model have higher simulation precision.
出处
《汽车安全与节能学报》
CAS
2010年第4期327-331,共5页
Journal of Automotive Safety and Energy
基金
国家"八六三"高技术研究发展项目(2006AA110101)
教育部"111计划"(111-2-11)
关键词
汽车碰撞
焊点建模
焊点失效
仿真精度
car crash
spotweld model
spotweld failure
simulation accuracy
