Scholarlink

<p>In this work, electromagnetic cold expansion process with high-speed loading was investigated though experiments and numerical simulations. A coupled electromagnetic–deformation numerical model was established and corresponding validation experiments were conducted with 7075-T651 aluminum alloy plates with pre-drilled holes (with interference range of 0.09375, 0.08025, 0.06707 and 0.05422, respectively) under a discharge energy of 9&#xa0;kJ. A coupled electromagnetic–deformation numerical model was established and validated at the geometric level by comparison with experimental measurements. The model was then used to analyze deformation behavior and residual stress distribution under different interference levels. The results showed that the maximum relative errors between simulation and experiment were 5.74% and 0.66%, respectively, demonstrating reasonable predictive capability for geometric deformation. The peak magnetic pressure was 54.58&#xa0;MPa and impact velocity 20&#xa0;m/s during electromagnetic cold expansion. The equivalent plastic strain and maximum extrusion stress (1209.22&#xa0;MPa) on the hole wall were higher at the inlet than outlet, decreasing with lower interference. The radius of inlet/outlet strain-defined plastic deformation zone were 4&#xa0;mm and 10&#xa0;mm. Inlet residual stress was smaller than that of outlet. The inlet radial residual tensile stress was 154.85&#xa0;MPa, outlet compressive − 332.9&#xa0;MPa, both diminishing with distance.</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

Numerical simulation research on strengthening mechanism during electromagnetic cold expansion

  • 期刊论文

  • 发表日期：

    2026年5月13日

查看全文
  • Xu Zhang,
  • Xuan Zou,
  • Kangjie Tang,
  • Qiqi Li,
  • Huakun Deng

摘要

In this work, electromagnetic cold expansion process with high-speed loading was investigated though experiments and numerical simulations. A coupled electromagnetic–deformation numerical model was established and corresponding validation experiments were conducted with 7075-T651 aluminum alloy plates with pre-drilled holes (with interference range of 0.09375, 0.08025, 0.06707 and 0.05422, respectively) under a discharge energy of 9 kJ. A coupled electromagnetic–deformation numerical model was established and validated at the geometric level by comparison with experimental measurements. The model was then used to analyze deformation behavior and residual stress distribution under different interference levels. The results showed that the maximum relative errors between simulation and experiment were 5.74% and 0.66%, respectively, demonstrating reasonable predictive capability for geometric deformation. The peak magnetic pressure was 54.58 MPa and impact velocity 20 m/s during electromagnetic cold expansion. The equivalent plastic strain and maximum extrusion stress (1209.22 MPa) on the hole wall were higher at the inlet than outlet, decreasing with lower interference. The radius of inlet/outlet strain-defined plastic deformation zone were 4 mm and 10 mm. Inlet residual stress was smaller than that of outlet. The inlet radial residual tensile stress was 154.85 MPa, outlet compressive − 332.9 MPa, both diminishing with distance.