A method for predicting vibration fatigue life of notched specimens under multi-axial coupled random excitation

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (17) : 105-113.

LUO Zhengbo1, FAN Xin1, LIU Feng1, CHEN Huaihai2, ZHENG Ronghui2

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Abstract

A frequency domain analysis model for the vibration fatigue life assessment of a notched specimen under multiaxial coupled random base excitations is proposed in the present paper. Firstly, the influence of coupling relationship between the PSD functions in two vibration directions on the fatigue damage of a notched specimen are deeply studied through the implement of biaxial random vibration fatigue test. Then, the stress PSD matrix of each node at the notch root is calculated by the random vibration analysis with the finite element method, and the crack initiation point of the notched specimen is assumed as the node experiencing the maximum root mean square value of von Mises stress. Next, the fatigue critical point of the notched specimen can be determined by the modified TCD combined with the crack initiation point. Finally, the vibration fatigue life of the notch specimen is computed by the frequency domain formulation of the Carpinteri-Spagnoli criterion. The result demonstrates that the multiaxial notch vibration fatigue life assessment model can provide the fatigue life evaluation with high accuracy, and the majority of the estimated fatigue lives are within 3 time scatter band.

Key words

vibration fatigue / multiaxial random base excitations / coherence / theory of critical distance / Carpinteri-Spagnoli criterion.

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LUO Zhengbo1, FAN Xin1, LIU Feng1, CHEN Huaihai2, ZHENG Ronghui2. A method for predicting vibration fatigue life of notched specimens under multi-axial coupled random excitation[J]. Journal of Vibration and Shock, 2023, 42(17): 105-113

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