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19 April 2007 Studies on effects of elevated temperature for guided-wave structural health monitoring
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Large thermal variations 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°C to 150°C). First, studies done to determine a suitable bonding agent are documented. That was 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°C to 150°C). Modeling efforts to explain the experimentally observed increase in time-of-flight and change in sensor response amplitude 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.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ajay Raghavan and Carlos E. S. Cesnik "Studies on effects of elevated temperature for guided-wave structural health monitoring", Proc. SPIE 6529, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2007, 65290A (19 April 2007); doi: 10.1117/12.715016;

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