Failure analysis of fasteners used in pressure safety index valve

Madan, M and Venkataswamy, MA and Sujata, M and Bhaumik, SK (2007) Failure analysis of fasteners used in pressure safety index valve. Project Report. National Aerospace Laboratories, Bangalore, India.

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Abstract

Three out of the four fasteners sent for investigation were found to have fractured in the threaded region. The fractographic features were completely obliterated due to post fracture corrosion. However, microstructural study and compositional analysis confirmed that the failure of the studs was by chloride stress corrosion cracking (SCC). Examination revealed that the SCC was promoted due to high hardness of the studs. Measurements showed that studs have average hardness of 582 HV as against the specification of 321 BHN. A detailed analysis of the failure is presented in this report.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: Fastener;Hardness;Stress corrosion cracking
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: 27 Jul 2011 14:11
Last Modified: 27 Jul 2011 14:11
URI: http://nal-ir.nal.res.in/id/eprint/9576

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