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| Fatigue Life Assessment for High-energy Pipe of Floating Nuclear Power Station under Shocking Based on Instantaneous Analysis |
| Received:November 22, 2018 Revised:February 25, 2019 |
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| DOI：10.7643/ issn.1672-9242.2019.02.020 |
| KeyWord:floating nuclear power station high-energy pipe underwater impact fatigue life |
| Author | Institution |
| BAI Fan |
Science and Technology on Thermal Energy and Power Laboratory, Wuhan 2nd Ship Design and Research Institute, Wuhan , China |
| LIU Yong |
Science and Technology on Thermal Energy and Power Laboratory, Wuhan 2nd Ship Design and Research Institute, Wuhan , China |
| WU Jun |
Science and Technology on Thermal Energy and Power Laboratory, Wuhan 2nd Ship Design and Research Institute, Wuhan , China |
| DAI Chun-hui |
Science and Technology on Thermal Energy and Power Laboratory, Wuhan 2nd Ship Design and Research Institute, Wuhan , China |
| XIAO Qi |
Science and Technology on Thermal Energy and Power Laboratory, Wuhan 2nd Ship Design and Research Institute, Wuhan , China |
| WANG Wei |
Science and Technology on Thermal Energy and Power Laboratory, Wuhan 2nd Ship Design and Research Institute, Wuhan , China |
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| Abstract: |
| Objective To estimate the fatigue life of high-energy pipes in floating nuclear power station under underwater impact. Methods The static response, mode shapes and dynamic response of the high-energy pipe were predicted to obtain the stress history of the pipe under underwater impact to provide basis stress spectrum import of the fatigue analysis. Based on the fatigue damage model, the impact fatigue life of the pipe was estimated with the aid of the FE-based fatigue analysis program nCode. Result The pipe stress would experience a number of cycles and the maximum stress exceeded the material yield limit by 10% during underwater impact. The impact fatigue life of the pipe under transverse impact was 3.95?104. Conclusion The maximum stress response occurs after the positive triangular wave and in the negative triangular wave of the impact load. It is a response lag phenomenon caused by the effect of inertia. The stress concentration region is located at the fixed end, elbow and tee branch. The fatigue rupture of pipe usually occurs in this region. |
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