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| Fatigue Life of Structure Selection of the 5th Rib under Wings Whole Tank Wall Plate of A Certain Type of Aircraft |
| Received:June 26, 2017 Revised:December 15, 2017 |
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| DOI：10.7643/ issn.1672-9242.2017.12.019 |
| KeyWord:a certain type of aircraft the 5th rib under wings whole tank end wall plate stringer continuous structure stringer disconnected structure fatigue life |
| Author | Institution |
| CHEN Qun-zhi |
Beijing Aeronautical Technology Research Center, Beijing , China |
| YAN Ya-bing |
Xi'an Aircraft Branch of China Aviation Industry Co., Ltd., Xi 'an , China |
| CUI Chang-jing |
Beijing Aeronautical Technology Research Center, Beijing , China |
| WU Zhi-chao |
Beijing Aeronautical Technology Research Center, Beijing , China |
| WANG Jian-bang |
Xi'an Aircraft Branch of China Aviation Industry Co., Ltd., Xi 'an , China |
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| Abstract: |
| Objective To research the fatigue life of structure selection of the 5th rib under wings whole tank wall plate of a certain type of aircraft. Methods Based on structure forms of stringer continuous and stringer disconnected determined preliminarily through the structure selecting design, comparative test for these two kinds of structure simulated specimen was carried out through static test and fatigue test. Results The static failure load of two structures was 588.20 kN and 587.97 kN, respectively. Both of them were consistent highly with the breaking load estimated (590 kN) by static strength design. Under the same constant amplitude loading spectrum conditions, the fatigue life of the median and under 95% of confidence and 95% of reliability of the stringer continuous structure was about 1.7 times and 4 times compared with the fatigue life of the stringer disconnected structure, respectively. The fatigue dispersion of the stringer continuous structure was much smaller than that of the stringer disconnected structures. The fatigue fracture of the long girder continuous structure mainly presented brittleness transgranular fracture characteristics, and the fatigue fracture of the stringer disconnected structure appeared mixed transgranular fracture characteristics, containing toughening fossa fracture and cleavage fracture. The fatigue fracture microstructures showed that the stringer disconnected structure produced a certain amount of plastic deformation in the fatigue process, it was explained from microscopic mechanism on the fatigue per-formance of the stringer continuous structure was better than that of the stringer disconnect structure. Conclusion The stringer continuous structure is better significantly than the stringer disconnect structures under the condition of the similar structure weight. |
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