航空Al7050合金的静动态力学特性研究及JC本构模型构建

doi:10.11896/cldb.20060201

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Abstract In order to study the static and dynamic mechanical properties of aeronautical Al7050 alloy, the quasi-static compression test of aeronautical Al7050 alloy was carried out with DNS100 electronic universal testing machine, and the flow stress-strain curve under the quasi-static room temperature was obtained according to the processed test data. Meanwhile, the dynamic compression test of aeronautical Al7050 alloy at different temperatures and strain rates were carried out by split Hopkinson pressure bar (SHPB) device with synchronous assembly system, and the flow stress-strain curves at different temperatures and strain rates were obtained according to the test data. Finally, the JC constitutive model under the test conditions was constructed by using the least square method based on the two-test data. The results show that the flow stress increases with the increase of strain rate, but when the temperature is higher than 400 ℃, the flow stress decreases with the increase of strain rate. With the increase of strain, the flow stress first increases linearly, then increases slowly, and finally decreases sharply. The flow stress and strain hardening index of the material decrease with the increase of temperature, and the JC constitutive model can predict the plastic flow stress well.

Key words： aviation Al7050 alloy static and dynamic mechanical properties split Hopkinson pressure bar JC constitutive model

Published: 04 June 2021

CLC number:

TG115.5+3

Fund:Shaanxi Provincial Science and Technology Department Key Research Project (2020GY-121) and the Graduate Innovation Fund Project of Shaanxi University of Technology (SLGYCX1924).

About author:: Yun Wang is a postgraduate student at Shaanxi University of Technology, he is mainly engaged in the research of static and dynamic mechanical properties and processing technology of difficult to machine materials.
Changming Zhang, Ph.D., professor of Shaanxi University of Technology, master's supervisor. He was selected as the talent project of “special support program” of Shaanxi Province in 2020, and the provincial key discipline leader of “Mechanical Engineering” in Shaanxi Province. He is mainly engaged in aircraft lan-ding gear performance testing and equipment development, aviation components material processing technology and difficult to machine material tool wear technology research. In recent years, he has published more than 40 academic papers and 7 invention patents. He presided over the completion of a number of Shaanxi Provincial Science and Technology Department of scientific research projects, Shaanxi Provincial Education Department of scientific research projects and CAAC Aircraft Co., Ltd. Changsha landing gear company horizontal project.

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Cite this article:

WANG Yun,ZHANG Changming,ZHANG Yu. Study on Static and Dynamic Mechanical Properties of Aviation Al7050 Alloy and Construction of JC Constitutive Model[J]. Materials Reports, 2021, 35(10): 10096-10102.

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http://www.mater-rep.com/EN/10.11896/cldb.20060201 OR http://www.mater-rep.com/EN/Y2021/V35/I10/10096

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