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<p>In this study, the dynamic mechanical properties of 7A75 aluminum alloy were investigated by split-Hopkinson pressure bar (SHPB) in a wide temperature range from − 100 °C to 300 °C and at different strain rates. The Zerilli–Armstrong (Z–A) constitutive model was built and modified to improve the prediction accuracy. The collision process at different speeds was simulated using Abaqus finite element software based on the modified Z–A model, and the deformation pattern and energy absorption mechanism were revealed. The results indicate that the predicted values of the modified Z–A model are consistent with the experimental data. The deformation degree of 2.4&#xa0;mm thick 7A75 aluminum alloy is comparable to that of 1.5&#xa0;mm thick Q&amp;P steel and DP980 steel under the 50&#xa0;km/h collision process. The lightweight of 43.09% is achieving. The formation of complex deformation patterns is the main mechanism for 7A75 aluminum alloy to effectively absorb energy.</p>

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Dynamic Deformation Behavior of High-Strength 7A75 Aluminum Alloy for Automotive Structural Components: Mechanical Properties, Constitutive Zerilli–Armstrong Model, and Simulation

  • 期刊论文

  • 发表日期：

    2025年9月17日

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  • Shuhao Zhou,
  • Bingbing Wu,
  • Hui Li,
  • Jian Zhuang,
  • Ying Cai,
  • Di Zhang,
  • Dianzuo Shang,
  • Longxin Liu,
  • Rui Feng

摘要

In this study, the dynamic mechanical properties of 7A75 aluminum alloy were investigated by split-Hopkinson pressure bar (SHPB) in a wide temperature range from − 100 °C to 300 °C and at different strain rates. The Zerilli–Armstrong (Z–A) constitutive model was built and modified to improve the prediction accuracy. The collision process at different speeds was simulated using Abaqus finite element software based on the modified Z–A model, and the deformation pattern and energy absorption mechanism were revealed. The results indicate that the predicted values of the modified Z–A model are consistent with the experimental data. The deformation degree of 2.4 mm thick 7A75 aluminum alloy is comparable to that of 1.5 mm thick Q&P steel and DP980 steel under the 50 km/h collision process. The lightweight of 43.09% is achieving. The formation of complex deformation patterns is the main mechanism for 7A75 aluminum alloy to effectively absorb energy.