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Effects of Elevated Temperature on Guided-wave Structural Health Monitoring

Department of Aerospace Engineering, The University of Michigan, 1320 Beal Avenue Ann Arbor, Michigan 48109, USA

^* To whom correspondence should be addressed.

	Abstract

Elevated temperatures can cause significant changes in guided-wave (GW) propagation and transduction for structural health monitoring (SHM). This work focuses on GW SHM using surface-bonded piezoelectric wafer transducers in metallic plates for the temperature range encountered in internal spacecraft structures (20–150°C). First, studies done to determine a suitable bonding agent are documented. This is then used in controlled experiments to examine changes in GW propagation and transduction using PZT-5A piezoelectric wafers under quasi-statically varying temperature (also from 20 to 150°C). Modeling efforts to explain the experimentally observed increase in time-of-flight and change in sensor response peak-to-peak magnitude with increasing temperature are detailed. Finally, these results are used in detection and location of mild and moderate damage using the pulse-echo GW testing approach within the temperature range.

Key Words: structural health monitoring, damage prognosis, guided waves, Lamb waves, thermal variation, temperature compensation, spacecraft structures, integrated systems health management, bonding agent.

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