Constitutive Behavior of 2219 Aluminum Alloy under Hot Stamping Condition

doi:10.3901/JME.2021.04.044

Abstract

Abstract: In hot stamping，the plastic deformation of aluminum alloy sheet occurs in nonisothermal conditions. To characterize the 2219 alloy hot deformation behavior under hot stamping condition，high precision tensile test method is developed based on the Gleeble system. The tensile tests employing the heating path representative of the hot stamping process are performed over a temperature range of 350-475 ℃ and a strain rate range of 0.01-1 s^-1. The Johnson-Cook (J-C) model is modified by combining the hardening of the Swift and Hockett-Sherby (H-S) model，and a new mixed hardening model is proposed. In this model，the relationship between the mixed hardening factor and the strain rate is established to describe the high-temperature deformation behavior of the 2219 alloy under various deformation conditions. The modified Johnson-Cook constitutive model is calibrated using the hot tensile test data，the results indicate that the modified Johnson-Cook model can provide the most accurate prediction for the 2219 hot flow behavior. Finally，a hot stamping simulation model of U-shaped cross-section part is established，and the reliability of the modified Johnson-Cook model is further verified by the simulation results.

Key words: 2219 aluminum alloy, hot stamping, hot tensile, flow behavior, constitutive model

CLC Number:

TG306

AN Jian, LI Yongfeng, ZHANG Yunguang, LI Shuhui. Constitutive Behavior of 2219 Aluminum Alloy under Hot Stamping Condition[J]. Journal of Mechanical Engineering, 2021, 57(4): 44-52.

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