Mechanical Behavior and Numerical Simulation of 7005 Aluminum Alloy Under Dynamic Impact
XU Congchang1, YE Tuo1,2, TANG Ming3, GUO Pengcheng1, TANG Xu1, WU Yuanzhi2, LI Luoxing1
1 State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082; 2 Automotive Parts Technology Research Institute,Hunan Institute of Technology, Hengyang 421002; 3 College of Civil Engineering, Hunan University, Changsha 410082
Abstract: The flow stress behavior of 7005 aluminum alloy at strain rate ranging from (1—5)×103 s-1 was investigated. The results show that 7005 aluminum alloy is sensitive to strain rate. The parameters of Johnson-Cook equation were obtained thorough least square method. The ABAQUS was used to simulate the adiabatic shear of hat like specimen. The simulated stress-strain curves are in agreement with expe-riment results. The calculation of temperature field is a way to estimate the occurrence of recrystallization, when the strain rate is 15 000 s-1, compared to the initial temperature, the average temperature rise of the sample is 405 ℃ in the range of 120—240 μs. A large number of equiaxed grains are detected by observing the microstructure of the deformed specimens, which is a typical character of recrystallization. The deformation tempe-rature rise and dynamic recrystallization softening behavior of 7005 aluminum alloy at high strain rate will provide important guidance for its application in automobile crash structural parts.
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2019, Vol. 33 
