Analysis of failed hold down bolt of fans of an air cooler

Bhaskaran, TA and Venkataswamy, MA and Parameswara, MA and Sujata, M and Keshab, Barai and Bhaumik, SK (2003) Analysis of failed hold down bolt of fans of an air cooler. Project Report. National Aerospace Laboratories, Bangalore.

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Abstract

The hold down bolt of the fans of an air cooler has failed by fatigue. Investigation showed that jamming of the link rod at the eye-end due to corrosion restricted the rotation of the link rod when the positioner acted to adjust the pitch of the blade. This has resulted in excessive stresses on the hold down bolt leading to failure by fatigue. The damages seen on other parts of the air cooler are secondary and subsequent to the failure of the hold down bolt. Use of stainless steel grade material for the construction of the linkages and periodic lubrication at the eye-end of the link rod are recommended to prevent the recurrence of similar failure.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: Bolt;fatigue;excessive stress
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, Materials Science Division
Depositing User: Mrs Manoranjitha M D
Date Deposited: 29 Jul 2011 12:13
Last Modified: 29 Jul 2011 12:13
URI: http://nal-ir.nal.res.in/id/eprint/9733

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