Failure analysis of bottom plate of rear torsion box of an aircraft STS fuselage

Madan, M and Bhuvana, R and Sujata, M and Venkataswamy, MA and Bhaumik, SK (2008) Failure analysis of bottom plate of rear torsion box of an aircraft STS fuselage. Project Report. National Aerospace Laboratories, Bangalore, India.

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Abstract

The cracked bottom plate of rear torsion box of an aircraft STS fuselage was sent to the laboratory for investigation. Examination revealed that the plate was severely corroded from inside. The corrosion was of exfoliation type. The corrosion had resulted in loss of the material layer by layer and thereby reducing the thickness to below 0.3 mm at the location of the cracks. Prior to removal of the cracked plate, the inside of the torsion box was examined through an opening. It was discovered that squirrel nest was present inside the torsion box. It is believed that over a period of time, the chemicals (either basic or acidic in nature) and moist atmosphere resulting from the excretion of the squirrel led to corrosion of the torsion box material.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: Aircraft;Rear torsion box;Failure;Corrosion
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: 18 Jul 2011 11:02
Last Modified: 18 Jul 2011 11:02
URI: http://nal-ir.nal.res.in/id/eprint/9426

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