Failure analysis of O-rings

Madan, M and Sujata, M and Bhaumik, SK (2011) Failure analysis of O-rings. Project Report. National Aerospace Laboratories, Bangalore, India.

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Two failed O-rings from the electro selector assembly belonging to an aircraft were sent to this laboratory for investigation. Examination showed that in both the O-rings, loss of material occurred by wear over a period of time. The wear pattern and the morphology of the worn out surface indicated that there was looseness in the O-rings which resulted in improper seating of the O-rings on the groove. Because of this, during motion of the piston, a sector of the rings had undesirable contact with the moving surfaces leading to accelerated wear on a sector of the rings. Analysis suggests that the failure was facilitated due to oversize of the O-rings and/or undersize of the groove on the piston. Evidences do not suggest any deficiencies in the material and/or deterioration in the material in service responsible for the failure.

Item Type: Monograph (Project Report)
Uncontrolled Keywords: Electro-selector assembly;O-rings; wear failure
Subjects: AERONAUTICS > Aeronautics (General)
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: Ms. Alphones Mary
Date Deposited: 08 Jul 2011 08:11
Last Modified: 08 Jul 2011 08:11

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