中低应变率下7075-T7351铝合金本构与失效模型对比

doi:10.11896/cldb.19060216

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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%.

Key words： intermediate and low strain rates dynamic mechanical properties constitutive relation failure model strain rate effect

Published: 29 May 2020

CLC number:

O347.1

Fund:This work was financially supported by the Aviation Science Foundation Project (2017ZD67002) and Tianjin Municipal Education Commission Scientific Research Project (2019KJ135).

About author:: Zhenyu Feng, Ph.D., professor of Civil Aviation University of China, master's supervisor and vice director of civil aircraft airworthiness certification technology and management research center. His research concentrate on the fields of aircraft airworthiness certification technology, aircraft structural strength, etc. He obtained his B.Eng. degree in Structural Mechanics and Strength of Aircraft, and the M.Eng. and Ph.D. degrees in solid mechanics from Northwestern Polytechnical University, in 1987, 1990, and 1995, respectively. In recent years, he has presided over and participated in a number of major sub-projects of large aircraft and china civil aviation administration science and technology projects.

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	FENG Zhenyu
	LI Henghui
	LIU Yi
	XIE Jiang
	MOU Haolei
	XI Xulong
	SHU Wan

Cite this article:

FENG Zhenyu,LI Henghui,LIU Yi, et al. Comparison of Constitutive and Failure Models of 7075-T7351 Alloy at Intermediate and Low Strain Rates[J]. Materials Reports, 2020, 34(12): 12088-12093.

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http://www.mater-rep.com/EN/10.11896/cldb.19060216 OR http://www.mater-rep.com/EN/Y2020/V34/I12/12088

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