document: Autonomous detection of crack initiation using surface-mounted piezotransducers In this paper we report on the application of an in situ health monitoring system , comprising an array of piezoceramic wafer elements , to the detection of fatigue degradation in metallic specimens exposed to cyclic loading . Lamb waves , transmitted through a beam test coupon , are sensed using small surface-mounted piezotransducer elements , and the signals are then autonomously analysed for indications relating to the onset of structural degradation . The experimental results confirm the efficacy of the approach and provide a demonstration of good robustness under realistic loading conditions , emphasizing the great potential for developing an automated in situ structural health monitoring system for application to fatigue-prone operational structures , such as aircraft
doc_bio_tags: O O O O O O O O O O O O O O O O O O B I I I O O O O O O B I I O O O O O B I O B I O O B I O B I O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B I O O O O O O O O O O O O O O O O B O O B I O O O O O O O O B I I I I I O O O O O O O O O O B
extractive_keyphrases: in situ health monitoring piezoceramic wafer elements fatigue degradation metallic specimens cyclic loading lamb waves structural degradation robustness loading conditions automated in situ structural health monitoring aircraft
abstractive_keyphrases: surface-mounted piezotransducer elements fatigue operational structures