汽车动力总成悬置的碰撞失效模拟研究
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摘要
汽车动力总成悬置在正面碰撞中对纵梁变形模式有着重要影响。为准确预测悬置的碰撞断裂失效行为,开展了铸铝材料的力学性能试验。基于Crach FEM韧性失效准则,建立带有失效准则的铸铝材料卡片,通过对悬置支架的落锤冲击试验和模拟对标,验证了铸铝材料卡片的准确性和悬置建模方法的可靠性。整车碰撞仿真结果表明,Crach FEM失效模型能准确模拟悬置断裂失效过程,使纵梁变形模式和车身加速度响应更贴合试验结果,提高汽车动力总成碰撞仿真的精度,为碰撞性能开发提供仿真评估手段。
Vehicle engine mounts have crucial influence on side rail deformation in frontal impact. In order to correctly predict the fracture failure behavior of engine mounts,a mechanical property test on cast aluminum material is conducted. Cast aluminum material card with failure criteria is set up based on CrachFEM tenacity failure criteria. Through the drop hammer test and simulation,the correctness of cast material card and the reliability of engine mounts modeling are verified. The results of vehicle crash simulation show that CrachFEM failure model can accurately simulate the fracture failure process of engine mounts,enable the deformation mode of side rail and the acceleration responses of car body closer to test results and enhance the accuracy of engine crash simulation,providing simulation assesement means for crashworthiness development.
Vehicle engine mounts have crucial influence on side rail deformation in frontal impact. In order to correctly predict the fracture failure behavior of engine mounts,a mechanical property test on cast aluminum material is conducted. Cast aluminum material card with failure criteria is set up based on CrachFEM tenacity failure criteria. Through the drop hammer test and simulation,the correctness of cast material card and the reliability of engine mounts modeling are verified. The results of vehicle crash simulation show that CrachFEM failure model can accurately simulate the fracture failure process of engine mounts,enable the deformation mode of side rail and the acceleration responses of car body closer to test results and enhance the accuracy of engine crash simulation,providing simulation assesement means for crashworthiness development.
引文
[1]洪求才,刘卫国,周大永.某款轿车变型开发中车身结构轻量化的研究[J].汽车工程,2017,39(2):232-236.
[2]张兰春,赵清海,张洪信,等.汽车动力总成悬置支架的多目标拓扑优化[J].汽车工程,2017,39(5):551-555.
[3]朱平,张宇,葛龙,等.基于正面耐撞性仿真的轿车车身材料轻量化研究[J].机械工程学报,2005,41(9):207-211.
[4]赖兴华,王磊,李洁,等.铝型材防撞梁的碰撞断裂失效表征[J].清华大学学报(自然科学版),2017,57(5):504-510.
[5]张迎军,涂金刚,张林波,等.可脱落式前副车架结构仿真与试验[J].计算机辅助工程,2017,26(4):32-38.
[6] HOOPUTRA H,GESE H,DELL H,et al. A comprehensive failure model for crashworthiness simulation of aluminum extrusions[J]. International Journal of Crashworthiness,2004,9(5):449-464.
[7]潘锋.热成形钢板的碰撞失效预测研究[C]. 2015年中国汽车安全技术学术会议,苏州,2015.
[8] HADJIOANNOU M,STEVENS D,BARSOTTI M. Development and validation of bolted connection modelling in LS-DYNA for large vehicle models[C]. 14thInternational LS-DYNA Users Conference,Dearborn,MI,2016.
[2]张兰春,赵清海,张洪信,等.汽车动力总成悬置支架的多目标拓扑优化[J].汽车工程,2017,39(5):551-555.
[3]朱平,张宇,葛龙,等.基于正面耐撞性仿真的轿车车身材料轻量化研究[J].机械工程学报,2005,41(9):207-211.
[4]赖兴华,王磊,李洁,等.铝型材防撞梁的碰撞断裂失效表征[J].清华大学学报(自然科学版),2017,57(5):504-510.
[5]张迎军,涂金刚,张林波,等.可脱落式前副车架结构仿真与试验[J].计算机辅助工程,2017,26(4):32-38.
[6] HOOPUTRA H,GESE H,DELL H,et al. A comprehensive failure model for crashworthiness simulation of aluminum extrusions[J]. International Journal of Crashworthiness,2004,9(5):449-464.
[7]潘锋.热成形钢板的碰撞失效预测研究[C]. 2015年中国汽车安全技术学术会议,苏州,2015.
[8] HADJIOANNOU M,STEVENS D,BARSOTTI M. Development and validation of bolted connection modelling in LS-DYNA for large vehicle models[C]. 14thInternational LS-DYNA Users Conference,Dearborn,MI,2016.