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清华大学学报(自然科学版)  2017, Vol. 57 Issue (5): 504-510    DOI: 10.16511/j.cnki.qhdxxb.2017.22.028
  汽车工程 本期目录 | 过刊浏览 | 高级检索 |
铝型材防撞梁的碰撞断裂失效表征
赖兴华1, 王磊1, 李洁2, 姜亚洲2, 夏勇3
1. 清华大学 苏州汽车研究院(相城), 苏州 215000;
2. 长安汽车股份有限公司, 重庆 414100;
3. 清华大学 汽车安全与节能国家重点实验室, 北京 100084
Characterization of the fracture of an aluminum alloy anticollision-beam to impact loading
LAI Xinghua1, WANG Lei1, LI Jie2, JIANG Yazhou2, XIA Yong3
1. Suzhou Automobile Research Institute (Xiangcheng), Tsinghua University, Suzhou 215000, China;
2. Changan Automobile Company Limited, Chongqing 414100, China;
3. State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China
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摘要 作为汽车轻量化的重要材料,铝合金的脆性断裂问题不可忽视。该文以某汽车铝型材防撞梁为研究对象,开展了铝合金静态和动态拉伸、静态剪切、静态缺口、静态拉剪以及穿孔等力学性能试验,获取了铝合金材料在不同应变率下拉伸应力状态的力学特性,以及准静态拉压剪等不同应力状态下的力学属性数据,使用Swift-Hockett-Sherby本构描述铝合金材料应变硬化特性,基于LS-DYNA有限元法模拟对标拉压剪等不同应力状态试验,获得不同应力状态试验的失效单元的应力三轴度和Lode角信息,标定了铝合金材料的修正的 Mohr-Coulomb(MMC)断裂准则。通过铝型材动态三点弯结构试验和模拟,验证了MMC断裂模型对于表征铝合金材料在不同应力状态下断裂失效的有效性。
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赖兴华
王磊
李洁
姜亚洲
夏勇
关键词 铝合金力学性能修正的Mohr-Coulomb(MMC)断裂防撞梁    
Abstract:Aluminum alloys are important light materials for vehicle weight reduction, but they frequently experience fracture under impact loading. This paper describes experimental and analytical methods for characterizing the fracture of aluminum alloy bumper beams. A test matrix is designed to obtain the material mechanical properties at different tensile strain rates and a variety of stress states, including tension, shear, notch tension, tension-shear and punch. The Swift-Hockett-Sherby law is used to describe the hardening of the material, with different stress states then simulated in the LS-DYNA finite element analysis environment to get a good correlation. Then, the stress triaxialities and lode angles extracted from the simulations are used to calibrate a modified Mohr-Coulomb (MMC) fracture model. Simulations of the material tests and a component bending test with the MMC model correlate well with the test results to support the validity of this method for fracture characterization, as well as the validity of the MMC fracture model for predicting metal fracture.
Key wordsaluminum alloy    mechanical properties    modified Mohr-Coulomb (MMC)    fracture    bumper beam
收稿日期: 2016-06-02      出版日期: 2017-05-20
ZTFLH:  U465.2+2  
引用本文:   
赖兴华, 王磊, 李洁, 姜亚洲, 夏勇. 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.
LAI Xinghua, WANG Lei, LI Jie, JIANG Yazhou, XIA Yong. Characterization of the fracture of an aluminum alloy anticollision-beam to impact loading. Journal of Tsinghua University(Science and Technology), 2017, 57(5): 504-510.
链接本文:  
http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2017.22.028  或          http://jst.tsinghuajournals.com/CN/Y2017/V57/I5/504
  图1 铝型材不同应力状态的材料试验样件(单位:mm)
  图2 材料试验测试系统
  图3 铝合金静动态单向拉伸力学性能
  图4 剪切、缺口拉伸和穿孔应力试验载荷位移曲线
  图5 动态三点弯曲试验装置
  图6 拉伸试验模拟对标
  表1 SHS模型标定后的参数值
  表2 MMC模型标定参数
  图7 标定后的MMC模型断裂面和断裂曲线
  表3 材料层次试验和仿真断裂位移误差分析
  图8 铝型材不同应力状态试验及含MMC失效准则的仿真模拟比对
  图9 结构三点弯试验及模拟对标
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