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<p>Vibration fatigue loading can degrade the elastic properties of selective laser melting (SLM) aluminum alloys, resulting in a reduction of the structure’s natural frequency, which is essential for the analysis of structural integrity and design of the structure. To account for the vibration-induced natural frequency degradation, continuum damage mechanics (CDM) is applied based on the finite element method (FEM) for the cantilever beam under random vibration fatigue loading, simulating elastic modulus degradation and natural frequency reduction due to the fatigue damage evolution. Vibration fatigue tests on SLM aluminum alloy cantilever beams assess natural frequency degradation across various power spectral density (PSD) magnitudes. Fractography analysis is conducted to investigate the mechanism of vibration fatigue failure. The predicted natural frequency degradation closely aligns with experimental measurements, and the vibration fatigue life predictions fall within an acceptable two-fold range, validating the fatigue damage analysis.</p>

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Finite Element Implementation of Continuum Damage Mechanics for SLM AlMgScZr Cantilever Under Random Vibration Loading

  • 期刊论文

  • 发表日期：

    2025年7月8日

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  • Zelin Zha,
  • Piao Li,
  • Haibiao Yin,
  • Yuqi Yang

摘要

Vibration fatigue loading can degrade the elastic properties of selective laser melting (SLM) aluminum alloys, resulting in a reduction of the structure’s natural frequency, which is essential for the analysis of structural integrity and design of the structure. To account for the vibration-induced natural frequency degradation, continuum damage mechanics (CDM) is applied based on the finite element method (FEM) for the cantilever beam under random vibration fatigue loading, simulating elastic modulus degradation and natural frequency reduction due to the fatigue damage evolution. Vibration fatigue tests on SLM aluminum alloy cantilever beams assess natural frequency degradation across various power spectral density (PSD) magnitudes. Fractography analysis is conducted to investigate the mechanism of vibration fatigue failure. The predicted natural frequency degradation closely aligns with experimental measurements, and the vibration fatigue life predictions fall within an acceptable two-fold range, validating the fatigue damage analysis.