| Abstrakt: |
Significant progress has recently been reported in the area of integrated structural health monitoring, with many sensor systems being deployed in actual operational environments. A key question that needs to be addressed and answered with regard to successfully implementing structural health monitoring technologies in aerospace systems involves the long-term operability, durability, and survivability of integrated sensor systems and their associated hardware. In this activity, the performance characteristics of surface-bonded piezoelectric sensors have been studied under accelerated exposure conditions typically found in an operational aircraft environment. In particular, sensor performance was studied for freeze-thaw, moderate heat levels, humidity, electrochemical attack, substrate bend and tensile strains, and dynamic vibration conditions. The sensor performance was characterized using displacement-field imaging, pitch-catch signal transmission, and pulse-echo signal transmission. Evidence of general performance reduction, sensor cracking, and sensor disbonding were all observed. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR] |
