COMPOSITES SCIENCE AND ENGINEERING ›› 2024, Vol. 0 ›› Issue (11): 43-49.DOI: 10.19936/j.cnki.2096-8000.20241128.005

• BASIC STUDY • Previous Articles     Next Articles

Random vibration fatigue life prediction of composite laminates based on successive ply failure mode

SHA Zixiang, JIAN Yueao, CAI Dengan, ZHOU Guangming*   

  1. State Key Laboratory of Mechanics and Control for Aerospace Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2023-09-04 Online:2024-11-28 Published:2025-01-14

Abstract: The random vibration fatigue life of composite laminates was studied by combining experimental and simulation methods. Vibration fatigue tests were conducted on composite laminates using a vibration table, and the natural frequency of the laminates was monitored and tracked in real-time using a laser vibration meter to obtain the random vibration fatigue life of the laminates. The finite element numerical analysis model is established. Under the random excitation, the equivalent stress power spectral density function of the random vibration of the structure is obtained. Combined with the Dirlik probability density function, the fatigue life of the laminated plate in the case of single-layer failure is obtained. The failure process of the laminated plate is simulated as the process of stiffness degradation layer by layer, continuous redistribution of stress, continuous accumulation of damage, and final overall failure. The result indicates that the error between the finite element calculation life results and the vibration fatigue test results is within the allowable range of engineering. This article can provide a feasible method for further experimental research on vibration fatigue life.

Key words: random vibration, fatigue life, composite material, laminated plates, finite element analysis

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