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| Bending Fatigue Test and Fatigue Life Analysis of Full-surface Hub Based on Numerical Simulation |
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| DOI：10.7643/issn.1672-9242.2023.05.011 |
| KeyWord:full-surface hub bending fatigue numerical simulation material nonlinearity effect of preload life prediction |
| Author | Institution |
| ZHU Zhi-peng |
China Helicopter Research and Development Institute, Jiangxi Jingdezhen , China |
| TANG Yong |
China Helicopter Research and Development Institute, Jiangxi Jingdezhen , China |
| LI Huo-ping |
Unit 92281 of Chinese People’s Liberation Army, Shandong Zhucheng , China |
| SUN Yun-wei |
China Helicopter Research and Development Institute, Jiangxi Jingdezhen , China |
| DENG Wen |
China Helicopter Research and Development Institute, Jiangxi Jingdezhen , China |
| SONG Gui-qiu |
School of Mechanical Engineering & Automation, Northeastern University, Shenyang Liaoning , China |
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| Abstract: |
| The work aims to predict the dangerous areas prone to fatigue damage and analyze the bending fatigue life of steel full-surface hubs. A finite element analysis model was established for the bending fatigue test condition of the full-surface hub. The method of bolt tightening, the impact of bolt preload on the hub, and the nonlinear characteristics of the material were taken into consideration comprehensively. The load was decomposed by establishing a local coordinate system at the end of the loading shaft, and the dynamic loading of the bending moment was finally realized. On this basis, the stress of the hub was analyzed, the stress life curve applicable to the hub was constructed, and the nominal stress method was used to predict the fatigue life. The change of the loading direction of the dynamic bending moment would significantly affect the stress distribution characteristics of the spoke surface. After the bolt preload was applied, the stress in the area near the bolt hole was significantly increased. Its influence should be considered in the calculation. After the load history of each node was obtained, the dangerous nodes of the hub were selected based on the high stress amplitude and average stress. The dangerous node positions in the bending fatigue test of this type of full-surface hub based on numerical simulation are all located near the inner fillet of the spoke ventilation hole. The corresponding optimization design can be carried out in this area to further improve the bending fatigue life of the hub. It can be analyzed that the current bending fatigue life of the wheel rim is about 76 000 times, which meets the requirements of national standards. |
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