21 March 2001 Crack-growth detection using a surface-mounted piezotransducer array
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Abstract
This paper reports on an experimental program aimed at assessing the feasibility of monitoring crack growth by means of a surface-mounted piezotransducer array. The host structure is interrogated using lamb-waves generated and sensed by elements in the array. An example is described involving a uniaxial edge-notched specimen subject to cyclic loading where the array is shown to be capable of detecting on a sustained basis crack growth increments of less than 0.1 mm. Although the piezoceramic elements were exposed to cyclic stress there was no measurable indication of element degradation,indica ting good fatigue durability properties under the loading regime considered. Experimental results are also shown that demonstrate a strong crack-state dependence,hig hlighting the need for care when interpreting signals from the piezotransducers.
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Nikolas Rajic, Stephen C. Galea, W. K. Chiu, "Crack-growth detection using a surface-mounted piezotransducer array", Proc. SPIE 4235, Smart Structures and Devices, (21 March 2001); doi: 10.1117/12.420887; https://doi.org/10.1117/12.420887
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