Study on Static and Dynamic Mechanical Properties of Aviation Al7050 Alloy and Construction of JC Constitutive Model
WANG Yun1, ZHANG Changming1,2, ZHANG Yu1
1 School of Mechanical Engineering, Shaanxi University of Technology, Hanzhong 723000, China 2 Shaanxi Provincial Key Laboratory of Industrial Automation, Hanzhong 723000, China
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.
王运, 张昌明, 张昱. 航空Al7050合金的静动态力学特性研究及JC本构模型构建[J]. 材料导报, 2021, 35(10): 10096-10102.
WANG Yun, ZHANG Changming, ZHANG Yu. Study on Static and Dynamic Mechanical Properties of Aviation Al7050 Alloy and Construction of JC Constitutive Model. Materials Reports, 2021, 35(10): 10096-10102.
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