Scholarlink

<p>This study develops an optimized anisotropic GTN damage model by integrating the Hill48 yield criterion to accurately characterize the anisotropic mechanical behavior and fracture evolution of AZ91D magnesium alloy during deep drawing. Uniaxial tensile tests at 150–300°C confirm that the alloy exhibits pronounced anisotropy, which is mitigated but not eliminated by elevated temperatures. The modified model shows excellent predictive performance, with the simulated stress-strain curves matching experimental data by &gt; 90%. Cylindrical deep drawing tests and numerical simulations reveal that the model predicts drawing height with an error &lt; 4.75% across all temperatures. The optimal processing window is determined as 200°C and 18&#xa0;mm/min, balancing formability, toughness, and production efficiency. SEM fracture analysis verifies that 200°C yields the most developed ductile dimples and optimal plasticity-toughness synergy. The key novelty of this work lies in the development of a Hill48-coupled anisotropic GTN model that explicitly accounts for the strong plastic anisotropy of rolled AZ91D magnesium alloy sheets, which conventional isotropic GTN models and most existing anisotropic damage models fail to integrate for warm deep drawing fracture prediction.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Mechanical Properties and Fracture Analysis of AZ91D Magnesium Alloy in Deep-Drawing Processes Based on the Optimized Anisotropic GTN Model

  • 期刊论文

  • 发表日期：

    2026年6月29日

查看全文
  • Xiaolong Gu,
  • Mingyan Liu,
  • Xiang Hu,
  • Yutao Li,
  • Xuhui Sun,
  • Chenzhen Li,
  • Fengmei Xue

摘要

This study develops an optimized anisotropic GTN damage model by integrating the Hill48 yield criterion to accurately characterize the anisotropic mechanical behavior and fracture evolution of AZ91D magnesium alloy during deep drawing. Uniaxial tensile tests at 150–300°C confirm that the alloy exhibits pronounced anisotropy, which is mitigated but not eliminated by elevated temperatures. The modified model shows excellent predictive performance, with the simulated stress-strain curves matching experimental data by > 90%. Cylindrical deep drawing tests and numerical simulations reveal that the model predicts drawing height with an error < 4.75% across all temperatures. The optimal processing window is determined as 200°C and 18 mm/min, balancing formability, toughness, and production efficiency. SEM fracture analysis verifies that 200°C yields the most developed ductile dimples and optimal plasticity-toughness synergy. The key novelty of this work lies in the development of a Hill48-coupled anisotropic GTN model that explicitly accounts for the strong plastic anisotropy of rolled AZ91D magnesium alloy sheets, which conventional isotropic GTN models and most existing anisotropic damage models fail to integrate for warm deep drawing fracture prediction.