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| Life Prediction Method Synthetically Considering the Influence Factors of Fatigue Strength |
| Received:March 21, 2020 Revised:April 25, 2020 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2020.07.020 |
| KeyWord:life prediction helical spring elastoplastic finite element analysis |
| Author | Institution |
| LI Dao-hang |
College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing , China |
| WU Xue-lei |
Beijing Institute of Space Launch Technology, Beijing , China |
| WAN Fang |
Beijing Institute of Space Launch Technology, Beijing , China |
| ZHANG Jun-wei |
Beijing Institute of Space Launch Technology, Beijing , China |
| LI Luo-jin |
College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing , China |
| SHANG De-guang |
College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing , China |
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| Abstract: |
| The paper aims to propose a life prediction method synthetically considering the influence factors of fatigue strength. The proposed comprehensive fatigue strength factor Kz was adopted to consider the effects of stress concentration, size and surface state on fatigue strength. Based on S-N curve method, Goodman equation was used to modify the average stress. Miner theorem was used to accumulate the fatigue damage. And a fatigue life prediction method suitable for mechanical structures was proposed. The constant amplitude and variable amplitude displacement controlled bench tests for a complex structural helical spring were carried out. The stress response history of the key dangerous point was obtained by elastoplastic finite element analysis. The proposed method was validated by the results of bench test, and the prediction errors were within a factor of 2. The proposed method can predict the fatigue life of mechanical structures well. |
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