Failure Analysis of a Fuel Supply Tube of an Aircraft Engine | ||||
| International Journal of Materials Technology and Innovation | ||||
| Article 2, Volume 4, Issue 2, December 2024, Page 1-8 PDF (1.34 MB) | ||||
| Document Type: Special issue | ||||
| DOI: 10.21608/ijmti.2024.325019.1108 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Mohamed Wahba   1; Khalid Hafez 2; Abdel-Monem EI-Batahy2
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| 1cmrdi | ||||
| 2CMRDI | ||||
| Abstract | ||||
| This paper presents a failure analysis of a fractured fuel supply tube and its associated assembly clip from an aircraft engine. The assembly clip, made of 17-7 PH stainless steel, exhibited fracture initiation at the inner surface of its terminal hole. Chemical analysis showed conformity to standard material specifications, and microstructural examination revealed a tempered martensite matrix. Scanning electron microscopy identified radial fatigue marks and evidence of fretting fatigue, transitioning to brittle fracture near the crack's termination. The fuel tube failed near the butt-welded joint, with no surface defects detected by dye penetrant testing. Chemical analysis confirmed the material met specifications for type 347 stainless steel. Microstructural analysis showed fracture initiation in the heat-affected zone, with low-cycle fatigue and grain boundary cracking observed. Scanning electron microscopy revealed fatigue striations and a transition to brittle fracture near the outer surface, indicating a combined fatigue and brittle failure mechanism. This investigation highlights the role of fatigue in both the fuel tube and clip failures, providing insights into improving component durability in aerospace applications. | ||||
| Keywords | ||||
| Fuel tube failure; Fretting fatigue; Heat-affected zone | ||||
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