整车耐撞自冲铆连接仿真失效参数求解方法研究

Research on Solving Failure Parameters of Self-Piercing Riveting Connection in Vehicle Crashworthiness Simulation

研究提出了一种基于Ls-dyna软件的自冲铆连接整车耐撞仿真方法,结合不同受力状态下的试验及有限元分析,求解不同受力状态下的自冲铆连接的失效参数,从而在保证仿真精度的同时提升仿真计算效率。在基于试验设计的基础上,首先建立了铆接接头的精细仿真模型,并利用*CONSTRAINED_SPR2建立了简化的仿真模型,以试验与精细仿真结果的提取值作为简化参数输入,可极大提高整车耐撞模型的运算速度。该方法通过与试验结果标定分析,可实现自冲铆连接失效力峰值仿真精度达90%以上,可应用于整车级耐撞分析。

A Ls-dyna software based self-piercing riveting joint simulation method for vehicle crashworthiness analysis of was proposed in this research.Method of solving failure parameters for self-piercing riveting joint was studied based on the combination of finite element analysis and test in different forced states,thus improving simulation calculation efficiency while ensuring simulation accuracy.Firstly,a refined simulation model for riveted joints was established based on experimental design,afterwards,a simplified simulation model was established using*CONSTRAINED_SPR2.Using the extracted values from experimental and refined simulation results as simplified parameter inputs can greatly improve the calculation speed of the vehicle crash crashworthiness model.Through this study,it is shown that this method can achieve a simulation accuracy of over 90% for the peak failure force of the selfpiercing riveting joint through calibration with experimental results,and can be applied to crashworthiness analysis of complete vehicle model.