基础随机激励下纤维增强复合薄板振动疲劳寿命预报

In order to solve the problems of traditional finite element modeling such as black box operation，high computational cost and lack of independent intellectual property rights，an analytical model for vibration fatigue life prediction of fiber reinforced composite thin plate under basic random excitation based on classical laminated plate theory， random vibration theory and Miner's linear accumulation damage criterion was established. Based on the stress modal method， the stress frequency response function of the fiber reinforced composite plate was deduced，and the random vibration equivalent stress power spectral density function of the structure was obtained considering the random excitation. Based on the probability density function corresponding to the Dirlik， Bendat and Benasciutti-Tovo frequency domain models， the corresponding vibration fatigue life was solved successfully. In addition， the correctness of the model and prediction results were verified by using ANSYS and nCode software. It was found that the deviations of life calculation results obtained by this model and the above commercial software were less than 14.8%. However，the calculation efficiency was improved by about 17% to 33%. Therefore，the model can provide an idea and a tool for predicting the vibration fatigue of anisotropic composite sheet under random excitation.