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<p>Holed plates expanded by the Lorentz force show excellent fatigue endurance since the residual compressive stress is uniform along the plates’ thickness, and the stress’s depth along the radial direction can be three times that in conventional cold-expanded plates. This study uses a numerical stress analysis to estimate the total fatigue life of electromagnetic-strengthened 1.5 mm-thick Al-alloy 2A12-T4 holed plates under uniaxial cyclic load. The total fatigue life is divided into crack initiation and propagation lives. Those two lives are predicted separately, and the total fatigue life is verified by experimental tests. 3D finite element simulations are conducted to obtain the stress data of the plates after electromagnetic processing and its redistribution under external loads using ANSYS LS-DYNA commercial software package. The Morrow equation predicts the initiation life, and the propagation life is estimated using the AFGROW computer code. A good agreement is reached between the predicted and experimental fatigue life.</p>

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Fatigue Life Prediction of Electromagnetic-Strengthened Al-Alloy 2A12-T4 Holed Plates

  • 期刊论文

  • 发表日期：

    2025年1月29日

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  • Xiaofei Xu,
  • Lixia Ouyang,
  • Huihui Geng,
  • Changxing Li,
  • Shaowei Ouyang

摘要

Holed plates expanded by the Lorentz force show excellent fatigue endurance since the residual compressive stress is uniform along the plates’ thickness, and the stress’s depth along the radial direction can be three times that in conventional cold-expanded plates. This study uses a numerical stress analysis to estimate the total fatigue life of electromagnetic-strengthened 1.5 mm-thick Al-alloy 2A12-T4 holed plates under uniaxial cyclic load. The total fatigue life is divided into crack initiation and propagation lives. Those two lives are predicted separately, and the total fatigue life is verified by experimental tests. 3D finite element simulations are conducted to obtain the stress data of the plates after electromagnetic processing and its redistribution under external loads using ANSYS LS-DYNA commercial software package. The Morrow equation predicts the initiation life, and the propagation life is estimated using the AFGROW computer code. A good agreement is reached between the predicted and experimental fatigue life.