| AUTOMOTIVE ENGINEERING |
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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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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.
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| Keywords
aluminum alloy
mechanical properties
modified Mohr-Coulomb (MMC)
fracture
bumper beam
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Issue Date: 15 May 2017
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2017,
Vol. 57
