爆炸载荷冲击下假人下肢的材料参数识别和修正方法

Identification and Correction Method of Material Parameters of Dummy's Lower Limbs Subjected to Impact of Explosive Load

为提高假人在爆炸载荷冲击下的模拟精度,以高速垂向冲击下假人下肢材料本构参数校验寻优为目标,基于爆炸载荷冲击波作用于车身结构产生的结构响应特性,确定模拟爆炸载荷冲击台架的冲击速度。设置不同的冲击速度进行假人下肢冲击实验,获取下肢的冲击力-时间曲线。对下肢的重要材料参数进行实验设计并获取仿真下肢胫骨力峰值,以仿真数据与实验数据误差最小化为目标进行下肢材料参数寻优。通过台架实验与有限元数值仿真校验对材料参数进行优化,得到下肢各组件之间材料本构模型参数的最佳匹配。结果表明:假人下肢模型材料参数优化后的仿真结果与实验结果一致性较好,可为高速垂向冲击下假人下肢材料模型修正提供技术支持。

The constitutive parameters of the dummy's lower limb material subjected to high-speed vertical impact are checked and optimized to improve the simulation accuracy of dummy under the impact of explosive load.In view of the structural response characteristics of vehicle body subjected to explosion shock wave load,the impact velocity of simulated explosion load impacting the test bench is determined.The impact test of dummy’slower limbs is carried out by setting different impact speeds to obtain the impact force-time curves of the lower limbs.The important material parameters of lower limbs are experimentally designed and the peak value of simulated lower limb tibial force is obtained to optimize the lower limb material parameters with the goal of minimizing the error between the simulated data and the experimental data.Through bench test and finite element numerical simulation verification,the material parameters are optimized,and the best matching of the material constitutive model parameters are obtained for the components of the lower limbs.The results show that the simulated results after optimizing the material parameters of the dummy's lower limb model are in good agreement with the test results,which can provide technical support for the revision of the dummy lower limb material model under high-speed vertical impact.