APPLICATION OF ELECTRICAL IMPEDANCE FOR DETECTION OF DEBONDING IN DENTED HONEY COMB STRUCTURES
Dominic Joseph, K. M. Verghese and R. E. Darange
Central Laboratory, Hindustan Aeronautical Laboratory, Nasik, India
Keywords: Honey Comb Structures, Impedance Stabilizer, Debond, NDT, Aircraft
ABSTRACT Honey comb structures are used in several control surfaces of aircraft. After the sorties of supersonic military aircraft, small dents are observed on the outer side of bottom skin surface of stabiliser flaps. It is essential to ensure that the bonded structures shall remain sound and shall not debond in order to avoid catastrophic situations during flight. There was no method available to find out the exact nature of damage/acceptability of the dented stabilizer. Several experiments were carried out using test samples prepared simulating the damages encountered in the aircraft. The paper deals with the details of the method developed, the analysis of the results and the applicability of the method for similar defects. The paper also deals with the recommendations for the repair of the flaps.
Publication Source: Trends in NDE Science & Technology; Proceedings of the 14th World Conference on Non-Destructive Testing, New Delhi, 8-13 December 1996.Vol. 3, pages 1681 - 1686
Publisher: Ashgate Publishing Company
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