30 May 1996 Use of PZT sensors for wave propagation studies
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Abstract
The measurement and prediction of the propagation of stress waves in impacted bars is the focus of this paper. Ultrasonic stress pulse propagation in bars is commonly monitored by means of stainless steel gauges. Because the outputs of these conventional gauges are very small and the frequency content of the stress pulses extend into the ultrasonic range, it is always necessary to employ amplifiers of a very high amplification and a very wide frequency bandwidth. On the other hand, PZT tiles of the same physical dimensions as the conventional gauge give voltage outputs which are factors of more than 10,000 greater than the conventional gauges. Consequently, the PZT tiles do not require any amplification system but produce signals which can be directly samples. In this paper PZT tiles of dimensions 5 by 3 mm, which are cut from standard PZT patches of dimensions 30 by 30 mm, are bonded to the surface of cylindrical bars and are used for monitoring the propagation of stress pulses induced in the bars by the collinear impact of spherical balls. The velocity of the spherical balls at impact is monitored by means of a pair of infra-red sensors. This velocity is used in conjunction with the Hertzian law of contact and the associated non-linear ordinary differential equation governing the impact of spherical balls against a rod to determine the force-time history of the impact. This force spectrum is used in a finite element model of the rod to predict the propagation of stress pulses in the rod. It is shown that the correlation between the measured and predicted stress pulses at different locations on the bars is very good.
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K. T. Feroz, K. T. Feroz, S. Olutunde Oyadiji, S. Olutunde Oyadiji, } "Use of PZT sensors for wave propagation studies", Proc. SPIE 2718, Smart Structures and Materials 1996: Smart Sensing, Processing, and Instrumentation, (30 May 1996); doi: 10.1117/12.240874; https://doi.org/10.1117/12.240874
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