Repair integrity monitoring of composite aerostructures using thermographic imaging

S. Grammatikos; E. Kordatos; N.-M. Barkoula; T. Matikas; A. Paipetis

doi:10.1117/12.847611

8 April 2010 Repair integrity monitoring of composite aerostructures using thermographic imaging

S. Grammatikos, E. Kordatos, N.-M. Barkoula, T. Matikas, A. Paipetis

Proceedings Volume 7649, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2010; 76491D (2010) https://doi.org/10.1117/12.847611
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2010, San Diego, California, United States

Abstract

Bonded repair offers significant advantages over mechanically fastened repair schemes as it eliminates local stress concentrations and seals the interface between the mother structure and the patch. However, it is particularly difficult to assess the efficiency of the bonded repair as well as its performance during service loads. Thermography is a particularly attractive technique for the particular application as it is a non-contact, wide field non destructive method. Phase thermography is also offering the advantage of depth discrimination in layered structures such as in typical patch repairs particularly in the case where composites are used. Lock-in thermography offers the additional advantage of on line monitoring of the loaded structure and subsequently the real time evolution of any progressive debonding which may lead to critical failure of the patched repair. In this study composite systems (CFRP plates) with artificially introduced defects (PTFE) were manufactured. The aforementioned methods were employed in order to assess the efficiency of the thermographic technique. The obtained results were compared with typical C-scans.

Citation Download Citation

S. Grammatikos, E. Kordatos, N.-M. Barkoula, T. Matikas, and A. Paipetis "Repair integrity monitoring of composite aerostructures using thermographic imaging", Proc. SPIE 7649, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2010, 76491D (8 April 2010); https://doi.org/10.1117/12.847611

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