Abstract

FINDEIS, D; GRYZAGORIDIS, J.  and  BOPAPE, W.. Impact Damage Detection on Composites using Electronic Speckle Pattern Interferometry. R&D j. (Matieland, Online) [online]. 2008, vol.24, pp.17-21. ISSN 2309-8988.

The paper presents the results from an attempt to detect damage resulting from impact loading events such as tool drop or bird collisions etc. on composite materials designed for structural applications in the aerospace industry. The investigation attempted to establish the possibility of detecting; beyond of what is obviously visible to the naked eye, the extent of damage inflicted on composite panels which were subjected to controlled impact. For the purpose, electronic speckle pattern interferometry was chosen as the non destructive evaluation technique to be employed in this study, because it is non-contacting, whole field, non limited to particular material types and provides fast and easy results in real-time. The specimens were subjected to low velocity impact energy levels by using an instrumented drop-weight impact tester. The results show that the probability of damage detection from impact is quite good even if the damage has been created at very low impact energy levels.

Keywords : ESPI; NDT; laser; optical speckle; impact.

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