行人头部与车辆碰撞中旋转速度对颅脑组织响应影响

为了探究旋转速度在行人头部与车辆碰撞中对颅脑组织响应影响,对46例真实交通事故进行了运动学重建获得行人头部与车辆碰撞线性、旋转速度分布特征,并依此建立了头部与风挡、发动机罩碰撞有限元仿真模型,分析了头部旋转速度在不同线性速度和碰撞位置下对颅脑应力应变响应影响特征.结果表明:在行人头部与风挡碰撞中,当线性速度小于40 k...

The influence of rotational speed of pedestrian head-to-vehicle collision on brain tissue response

A distribution of pedestrian head-vehicle impact linear/rotational speed was firstly obtained by kinematics reconstruction of 46 real world cases to investigate the effect of pedestrian head rotational speed on brain injury risk in vehicle collisions.A finite element(FE)simulations of head-to-windscreen and head-to-bonnet impacts was conducted with these data,and the brain response was analyzed under different head rotational/linear speeds and collision locations.The results show that in head-to-windshield impacts,the maximum principal stress and Von Mises stress increase with the increase of head rotational speed when the linear speed is less than 40 km/h,and the rotational speed has no significant effect on brain response when the linear speed is greater than 40 km/h;for head-to-bonnet impacts,the maximum principal stress and Von Mises stress increase with the increase of head rotational speed under all impact conditions,leading to significant increase in brain injury risk.It is suggested that the effect of head rotational speed and the difference between windshield and bonnet impact should be considered in vehicle safety evaluation.