6XXX铝合金防撞梁总成在动静态载荷下的变形行为

Deformation behavior of 6XXX aluminum alloy anti-collision beam assembly under dynamic and static loading

针对6XXX铝合金防撞梁总成,采用准静态拉伸实验、200 s-1动态拉伸实验获得材料的应力-应变曲线,通过数值模拟得到6063-T6和6082-T6合金材料的Swift-Hockett-Sherby硬化模型参数,对6XXX铝合金防撞梁总成的三点静压和13 km·h-1台车碰撞进行数值模拟和实验验证。结果表明:应变速率变化范围为0.001~200 s-1时,6063-T6合金应变率敏感性不明显,6082-T6合金表现出明显的应变率敏感性;基于拉伸试验和数值模拟得到的Swift-Hockett-Sherby硬化模型参数能较精确地表征铝合金的塑性行为;三点静压的支反力-位移曲线和低速碰撞的加速度-时间曲线以及变形行为与仿真预测结果吻合度较高,该方法能够准确地预测6XXX铝合金防撞梁总成在动静态载荷下的变形行为。

In view of of 6XXX aluminum alloy anti-collision beam assembly,the stress-strain curves were obtained by quasi-static tensile test and 200 s-1 dynamic tensile test.The Swift-Hockett-Sherby hardening model parameters of 6063-T6 and 6082-T6 alloy were obtained by numerical simulation.Numerical simulation and experimental verification were carried out on the three-point static pressure and 13 km·h-1 sled crash test of the 6XXX aluminum alloy anti-collision beam assembly.The results show that when the strain rate range is from 0.001 to 200 s-1,6063-T6 alloy has no obvious strain rate sensitivity,while 6082-T6 alloy has obvious strain rate sensitivity.The parameters of Swift-Hockett-Sherby hardening model obtained based on tensile test and numerical simulation can accurately characterize the plastic behavior of aluminum alloy.The supporting force-displacement curves of three-point static pressure test and the accelerationtime curve of low-speed collision as well as deformation behavior,are in good agreement with simulation results.This method can predict the deformation behavior of 6XXX aluminum alloy anti-collision beam assembly under static and dynamic loads with satisfactory accuracy.