Test results of smart aircraft fastener for KC-135 structural integrity

Jeffrey N. Schoess; Greg Seifert

doi:10.1117/12.316996

21 July 1998 Test results of smart aircraft fastener for KC-135 structural integrity

Jeffrey N. Schoess, Greg Seifert

Proceedings Volume 3330, Smart Structures and Materials 1998: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials; (1998) https://doi.org/10.1117/12.316996
Event: 5th Annual International Symposium on Smart Structures and Materials, 1998, San Diego, CA, United States

Abstract

Hidden and inaccessible corrosion in aircraft structures is the number one logistics problem for the US Air Force, with an estimated maintenance cost in excess of $LR 1.0B per year in 1990-equivalent dollars. The Smart Aircraft Fastener Evaluation (SAFE) system was developed to provide early warning detection of corrosion-related symptoms in hidden locations of aircraft structures. The SAFE system incorporates an in situ measurement approach that measures and autonomously records several environmental conditions within a Hi-Lok aircraft fastener that could cause corrosion. The SAFE system integrates a miniature electrochemical microsensor array and a time-of-wetness sensor with an ultra low power 8-bit microcontroller and 4- Mbyte solid-state FLASH archival memory to measure evidence of active corrosion. A summary of the technical approach and a detailed analysis of the KC-135 lap joint test coupon results are presented.

Citation Download Citation

Jeffrey N. Schoess and Greg Seifert "Test results of smart aircraft fastener for KC-135 structural integrity", Proc. SPIE 3330, Smart Structures and Materials 1998: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials, (21 July 1998); https://doi.org/10.1117/12.316996

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