Failure analysis of pipe assembly of an aircraft

Madan, M and Sujata, M and Raghavendra, K and Bhaumik, SK (2011) Failure analysis of pipe assembly of an aircraft. Project Report. National Aerospace Laboratories, Bangalore, India.

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Abstract

A cracked pipe assembly of hydraulic system-II of an aircraft was forwarded to this laboratory for establishing the cause of failure. Investigation revealed that the tube of the pipe assembly had developed a circumferential crack beneath one of the swaged end fittings by fretting fatigue mechanism. Analysis suggests that the reason for setting in fretting damage at the joint was due to inadequate closeness of the fit that was formed by swaging. Study also showed that after initiation, the propagation of the fatigue crack was relatively fast indicating possibility of substantial assembly stresses in the tube. The material of construction of the tube was found to conform to AMS 4944D Ti-alloy specification, and no metallurgical abnormalities in the material were found responsible for the failure. A detailed analysis of the failure is presented in this report and a few recommendations suggested for prevention of recurrence of similar failures in future.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: Pipe assembly;Ti-alloy tube;Leakage;Crack;Fretting fatigue; Assembly stresses
Subjects: AERONAUTICS > Aeronautics (General)
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Division/Department: Materials Science Division, Materials Science Division, Materials Science Division, Materials Science Division
Depositing User: Ms. Alphones Mary
Date Deposited: 12 Jul 2011 10:29
Last Modified: 12 Jul 2011 10:29
URI: http://nal-ir.nal.res.in/id/eprint/9338

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