Plastic Flow Behavior and Constitutive Model of 7075-H18 Aluminum Alloy Sheet Based on Hot Forming Process

doi:10.3901/JME.2024.02.188

Abstract

Abstract: In order to support the design of hot forming technology and the tooling die development of 7075 high-strength aluminum alloy sheet, by taking the 7075-H18 sheet suitable for continuous hot forming as the research object, a systematical study on the hot-stretching plastic flow characteristics of the 7075 sheet under hot forming conditions is carried out by virtue of Gleeble-3800 thermal simulation system, and an improved Arrhenius constitutive model is established based on the experimental data. The hot-stretching test results showed that the flow behaviors of the 7075 sheets are sensitive to deformation temperature and strain rate. Within the selected temperature range (300- 450 ℃) and strain rate range (0.001-10 s^-1), the plastic flow stress of the sheet decreased significantly with the increase of deformation temperature or the decrease of strain rate, and the elongation after fracture increased with the increase of deformation temperature or strain rate. The improved Arrhenius model could accurately predict the plastic flow behavior of the 7075 sheets. The Spearman correlation coefficient for the predicted data and experimental data could reach 0.9977, and the mean square error is less than 13.2. The improved Arrhenius model provides an accurate material constitutive model for the numerical simulation of 7075-H18 aluminum alloy sheet in hot forming process.

Key words: 7075-H18 aluminum alloy, hot forming, plastic flow behavior, constitutive model, numerical simulation

CLC Number:

TG389

WANG Gang, GU Zhengwei, YU Ge, LI Xin. Plastic Flow Behavior and Constitutive Model of 7075-H18 Aluminum Alloy Sheet Based on Hot Forming Process[J]. Journal of Mechanical Engineering, 2024, 60(2): 188-196.

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