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| Multi-axis Vibration Fatigue Life Prediction Based on Critical Plane |
| Received:June 29, 2020 Revised:July 07, 2020 |
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| DOI：10.7643/issn.1672-9242.2020.09.017 |
| KeyWord:multi-axis fatigue critical plane fatigue life prediction weight function random vibration fatigue |
| Author | Institution |
| PEI Chen-hui |
a. State Key Laboratory of Mechanics and Control of Mechanical Structures, b. Institute of Vibration Engineering Research, Nanjing University of Aeronautic and Astronautic, Nanjing , China |
| HE Huan |
a. State Key Laboratory of Mechanics and Control of Mechanical Structures, b. Institute of Vibration Engineering Research, Nanjing University of Aeronautic and Astronautic, Nanjing , China |
| CHEN Guo-ping |
a. State Key Laboratory of Mechanics and Control of Mechanical Structures, b. Institute of Vibration Engineering Research, Nanjing University of Aeronautic and Astronautic, Nanjing , China |
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| Abstract: |
| The work aims to propose a new high cycle multi-axis fatigue life prediction method based on critical plane normal stress. By projecting the principal stress, the stress in the critical plane at each moment was obtained, and the fatigue damage under different critical planes was calculated by rain flow method. Then, the angular expected value of the principal stress was obtained through weight function to predict the fatigue life of the structure. Through the simulation of the test specimen, the forced acceleration excitation with PSD frequency range of 8~200 Hz in two directions and value of 0.006, 0.003, 0.008 g2/Hz, was applied to the bottom to obtain the multi-axis stress response, so as to calculate the predicted life of the random acceleration vibration fatigue test under four working conditions. Through comparison, the test life error was basically within the bounds of 2 times. The new fatigue life prediction method based on the critical plane normal stress can effectively predict the fatigue life of multi-axis vibration. |
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