Failure analysis of Banner Target Towing (BTT) Cables

Madan, M and Sujata, M and Venkataswamy, MA and Bhaumik, SK (2011) Failure analysis of Banner Target Towing (BTT) Cables. Project Report. National Aerospace Laboratories, Bangalore, India.

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Examination of the failed BTT kits revealed that the failure was in the cables and not in the weak links. In all cases, the failure was by overload and there were no evidences to suggest that there was sudden deterioration in the mechanical properties of the cables due to increase in the environment temperature beyond critical temperatures. The possibility of fusion in any of the components of the weak links leading to non-breakage of the weak links ahead of the fracture of the cables during acceleration runs at the end of the trials is also ruled out. Examination of the data provided and the laboratory test results showed that the breaking load of the cables of the BTT kits is lower than that of the weak links. Hence, the failure observed in the BTT kits during Phase IV trials is quite natural. Analysis shows that the dimension of the shear pin chosen for the weak links is not appropriate for the present flying conditions. In view of this, it is recommended that the design of the weak link is revisited and a margin of 150-200 kg is built in so that the weak links fail ahead of the BTT cables as desired.

Item Type: Monograph (Project Report)
Uncontrolled Keywords: BTT cables;Failure;Strength;Weak link;Shear pin
Subjects: AERONAUTICS > Aeronautics (General)
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: Ms. Alphones Mary
Date Deposited: 14 Jul 2011 11:08
Last Modified: 14 Jul 2011 11:08

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