摘要
以某城市轨道车辆的防爬器为研究对象,重点进行了与防爬器铝合金材料率相关的应力应变曲线测试、防爬器碰撞试验及相关的数字模拟计算。研究表明Johnson-Cook本构模型能够很好地模拟该防爬器材料在大应变变形或材料失效时的物理力学特性,且数字模拟计算的塑性变形过程与碰撞试验结果保持了合理的一致性;防爬器加速度、纵向位移的仿真结果和碰撞试验数据相对误差均小于10%,满足EN15227-2008的防撞性验证要求。因此通过试验数据对有限元分析模型进行校正,可以提高有限元模型的精确度,为以后改进和优化车体结构提供参考和帮助。
Based on the anti-climber device of some urban mass transit vehicle, this paper places emphasis on rate dependent stress-strain curve test of anti-climber aluminum alloy material, crash test of anti-climber and relative numerical simulation calculation. The research demonstrates that Johnson-Cook constitutive model can well simulate the action of mechanical properties of aluminum alloy materials with large strain deformation or failure. And there is a reasonable consistency between anti-climber numerical plastic deformation process and the crash test results. There is a relative error of acceleration and displacement which is less than 10% between the numerical simulation result and crash test data, which satisfies the requirement of EN15227-2008. Therefore, the accuracy of the finite element model can be improved by using the experimental data, which can provide reference and help to improve the car body structure in the future.
出处
《电力机车与城轨车辆》
2017年第6期46-51,共6页
Electric Locomotives & Mass Transit Vehicles
