Chapter 8 - Other Sensors for {SHM} of Aerospace Composites

By Giurgiutiu, Victor
Published in Structural Health Monitoring of Aerospace Composites Academic Press 2016

Abstract

This chapter covers other sensors that could be used in structural health monitoring (SHM) of aerospace composites, e.g., conventional resistance strain gages and the electrical properties sensors. The resistance strain gage sensing principles, strain gage instrumentation (both cabled and wireless), and the specifics of aerospace strain gage technology are reviewed. Several examples of strain gage usage in aerospace composite applications are given. The electrical property sensing principles used in conjunction with aerospace composites are presented. Of these, the electrical resistance measurements have found extensive applications in the {SHM} of carbon fiber-reinforced polymer (CFRP) aerospace composites because the {CFRP} composites have a mild conductivity that changes significantly with the appearance of internal damage. Frequency domain methods for electrical {SHM} of aerospace composites are discussed next. The use of electrochemical impedance spectroscopy for detection of damage growth in aerospace composites is briefly reviewed. Electromagnetic methods that could be used with both conductive and nonconductive composite structures are also mentioned.

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