Dynamic Tensile Properties and Constitutive Model of 5052 Aluminum Alloy

In order to improve the safety of 5052 aluminum alloy in application and accurately calculate the strength of structural parts under complex loads, it is very necessary to study the mechanical properties of materials at different strain rates. In this paper, high temperature electronic universal testing machine and split Hopkinson tensile bar(SHTB) device are used to carry out the quasi-static and high strain rate tensile tests, the stress-strain curves of the materials are obtained, and a constative model which could accurately describe the plastic deformation behavior of the material is established. The results show that 5052 aluminum alloy has a distinct strain rate sensitivity, and with the increase of strain rate, the yield strength and ultimate strength increasing. Based on the experimental results, a modified Johnson-Cook model is proposed to fit the dynamic constitutive relation of the material, the fitting results are in good agreement with the test data; the ANSYS software is further used to simulate the uniaxial tensile process of the sample under high strain rate, and the stress-strain curve of the typical node is extracted, the results is consistent with the test result. It is indicated that the modified Johnson-Cook model can better describe the dynamic characteristics of 5052 aluminum alloy, and can provide data support for numerical simulation in practical engineering, so as to provide reliable reference and effective guidance for parts processing technology, structural design and actual production. © 2022 Journal of Mechanical Engineering.