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| Fracture Failure Analysis of Hydraulic Pump Mounting Seat Bolt for a Certain Type of Aircraft |
| Received:June 27, 2018 Revised:August 25, 2018 |
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| DOI：10.7643/ issn.1672-9242.2018.08.011 |
| KeyWord:mounting seat bolt hydraulic pump fracture failure analysis |
| Author | Institution |
| ZHOU Yi |
Aircraft Repair & Overhaul Plant, Civil Aviation Flight University of China, Guanghan , China |
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| Abstract: |
| Objective To find out the cause for fracture of fixed bolt on the mounting seat of a hydraulic pump for a certain aircraft. Methods The fracture morphology of multiple groups of bolts was observed. Mechanical performance testing and material organization analysis were carried out. Results There were no obvious corrosion and oxidation characteristics at the break edge of the bolt, and there were more obvious features of hydrogen brittle fracture sections. The hardness of the bolts exceeded the standard and no harmful inclusions and phosphates were found. Conclusion Bolts may have defects at the time of manufacture. Excessive hardness and dehydrogenation are the main causes of fracture. According to the results of the analysis, relevant suggestions and inspection directions are put forward. |
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