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| Improving Efficiency of Crack Propagation Life Assessment for LNG Independent Tank |
| Received:July 26, 2024 Revised:September 08, 2024 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2024.11.014 |
| KeyWord:LNG independent tank crack propagation stress intensity factor fatigue load computational efficiency life assessment |
| Author | Institution |
| SUN Qiang |
Dalian Shipbuilding Industry Co., Ltd., Liaoning Dalian , China |
| LI Bairui |
Dalian University of Technology, Liaoning Dalian , China |
| PAN Shuai |
Dalian Shipbuilding Industry Co., Ltd., Liaoning Dalian , China |
| PENG Dongsheng |
Dalian Shipbuilding Industry Co., Ltd., Liaoning Dalian , China |
| GUO Qiang |
Dalian Shipbuilding Industry Co., Ltd., Liaoning Dalian , China |
| CHEN Jingjie |
Dalian University of Technology, Liaoning Dalian , China |
| HUANG Yi |
Dalian University of Technology, Liaoning Dalian , China |
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| Abstract: |
| The work aims to improve the evaluation method of crack propagation life and leakage of LNG independent tanks considering the influence of ultra-low temperature liquid storage environments. Taking the crack propagation area of LNG independent tanks as the research object, the empirical formula of crack tip stress intensity factors and the crack propagation rate formula were used to analyze the effectof fatigue load with 108 cycles on crack growth life under different sequencing modes, and the main factors affecting the calculation accuracy and efficiency were found out.The calculation efficiency of the crack propagation program was low and the application condition was limited because the load cycle number was too large. In this paper, two simplified crack propagation simulation methods wereproposed, which couldreduce the cycle number of the crack propagation program by 5 orders of magnitude. These two methods not only greatly improve the calculation efficiency and reduce the application requirements of the program, but also achieve high calculation accuracy, which lays a foundation for the popularization and application of the crack growth life evaluation program of LNG independent tanks. |
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