Comparison of Constitutive and Failure Models of 7075-T7351 Alloy at Intermediate and Low Strain Rates
FENG Zhenyu1, LI Henghui1, LIU Yi1, XIE Jiang1, MOU Haolei1, XI Xulong2, SHU Wan2
1 College of Airworthiness, Civil Aviation University of China, Tianjin 300300, China 2 Aviation Key Laboratory of Science and Technology on Structures Impact Dynamics, Aircraft Strength Research Institute of China, Xi'an 710065, China
Abstract: To calibrate the material constitutive of aluminum alloy and compare the different simulation failure models, the quasi-static tensile tests and dynamic tensile tests for Al 7075-T7351 specimens were carried out to obtain the material mechanical properties at intermediate and low strain rates within 100 s-1. The Johnson-Cook constitutive model, Swift constitutive model and Hartley and Srinivasan constitutive model were used to characterize the plastic strain-enhanced mechanical behavior of aluminum alloy material. The dynamic tensile simulations were conducted by using the maximum plastic strain failure criterion, Johnson-Cook model, and tabulated Johnson-Cook model, and the simulated accuracy of three failure models were compared and analyzed. The results showed that the flow stress of Al 7075-T7351 had a weak strain rate effect, and the maximum increment of failure strain was 16.8% at the intermediate and low strain rate within 100 s-1. Three constitutive models could accurately characterize the plastic strain-enhanced mechanical behavior of aluminum alloy. The dynamic tensile simulation result using tabulated Johnson-Cook model was in the best agreement with experimental result, and the plastic failure strain error was less than 4%.
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