Failure analysis of fixed door assembly of nose landing gear jack of an aircraft

Madan, M and Suresh Kumar, M and Venkataswamy, MA and Sujata, M and Bhaumik, SK (2007) Failure analysis of fixed door assembly of nose landing gear jack of an aircraft. Project Report. National Aerospace Laboratories, Bangalore, India.

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Abstract

The fixed door assembly an aircraft has cracked by fatigue. Multiple fatigue cracks were found to have initiated on the L-angle close to the rivet region. Detailed examination revealed network of surface cracks in the vicinity of the crack origin regions. These surface cracks acted as stress concentration sites for multiple fatigue crack initiation. No metallurgical abnormalities were found responsible for the fatigue crack initiation. The type and nature of surface cracks observed in the crack initiation region indicates that these cracks are preexisting ones and appears to have developed during fabrication. The exact reason for presence of such surface cracks needs to be established and necessary measures incorporated to prevent the recurrence of similar failure.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: Aircraft nose landing gear;Fatigue;Preexisting cracks
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, Materials Science Division
Depositing User: Ms. Alphones Mary
Date Deposited: 27 Jul 2011 11:31
Last Modified: 27 Jul 2011 11:31
URI: http://nal-ir.nal.res.in/id/eprint/9586

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