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| Fracture Damage Analysis and Improvements on the Bolt at Suspension Point of Vertical Tail's Rudder |
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| DOI：10.7643/issn.1672-9242.2022.07.010 |
| KeyWord:vertical tail rudder bolt fracture |
| Author | Institution |
| YANG Jia-qin |
WuHu State-owned Factory of Machining, Wuhu , China |
| ZHANG Ping |
WuHu State-owned Factory of Machining, Wuhu , China |
| JI Guo-liang |
WuHu State-owned Factory of Machining, Wuhu , China |
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| Abstract: |
| The fracture damages at different levels of No.4 connecting bolts at vertical tail's rudder are found in the service of an aircraft, this paper aims to analyze the causes and make design improvement measures. In this paper, the fracture morphology and characteristics of the bolt are studied from the macrocosm and microcosm, the microstructure and mechanical properties of the bolt materials are analyzed, and the structure and function of bolts in the same position as those in the same type of aircraft are compared and analyzed. The results show that the fracture edge of the bolt has no obvious corrosion and oxidation characteristics, no harmful inclusions and phosphide, and the hardness and tensile strength meet the requirements of the material properties. The structure of the connecting bolt at the 4th suspension point of the rudder of this type of aircraft is more obvious in stress concentration and lower in material strength than that of the same type of aircraft at the same position, this link structure has design defects. The fracture property of the connecting bolt is fatigue fracture, and the main cause of fatigue fracture is that the bolt is subjected to abnormal tension and bending cyclic load. According to the results of bolt fracture and performance analysis, the proposed design improvement scheme can meet the requirements of bolt material selection, strength, stiffness and durability in aircraft structural design specifications. It has been verified that the solution meets the technical requirements of aircraft assembly and can ensure the safe use of the aircraft throughout its life. |
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