Dynamic Mechanical Properties and Modification of J-C Constitutive Model of 6061-T651 Aluminum Alloy

doi:10.3901/JME.2020.20.074

Abstract

Abstract: In order to describe the stress-flow behavior of 6061-T651 aluminum alloy reasonably, the mechanical property of 6061-T651 aluminum alloy under quasi-static, high temperature and high strain rate are tested by universal material testing machine and Hopkinson pressure bar respectively, and the stress-strain curves of 6061-T651 aluminum alloy under different conditions are obtained. Based on the experimental results, the Johnson-Cook constitutive model is modified to obtain the Modified Johnson-Cook(MJC) model, and the parameters of the MJC model are calibrated. In order to verify the validity of MJC model and parameters, Taylor bar test is carried out for cylinder projectile with a diameter of 5.95 mm to impact rigid target, and for rigid projectile with a diameter of 12.68 mm to impact a thickness of 2 mm target plate by a one-stage gas gun. Finally, the three-dimensional impact model of Taylor rod, projectile and target are established by ABAQUS/Explicit finite element software. Based on MJC constitutive model, Taylor bar impact and Modified Mohr-Coulomb(MMC) fracture criterion are used for numerical simulation of projectile and target impact. The results show that the modified MJC constitutive model can effectively describe the stress flow behavior and deformation behavior of 6061-T651 aluminum alloy under large strain, high strain rate and high temperature.

Key words: 6061-T651 aluminum alloy, mechanical property, constitutive model, Taylor rods, impact

CLC Number:

TG156

DENG Yunfei, ZHANG Yong, WU Huapeng, ZENG Xianzhi. Dynamic Mechanical Properties and Modification of J-C Constitutive Model of 6061-T651 Aluminum Alloy[J]. Journal of Mechanical Engineering, 2020, 56(20): 74-81.

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