NASA NTRS · 20160007836
A Piezoelectric Shear Stress Sensor
Abstract
In this paper, a piezoelectric sensor with a floating element was developed for shear stress measurement. The piezoelectric sensor was designed to detect the pure shear stress suppressing effects of normal stress generated from the vortex lift-up by applying opposite poling vectors to the: piezoelectric elements. The sensor was first calibrated in the lab by applying shear forces and it showed high sensitivity to shear stress (=91.3 +/- 2.1 pC/Pa) due to the high piezoelectric coefficients of PMN-33%PT (d31=-1330 pC/N). The sensor also showed almost no sensitivity to normal stress (less than 1.2 pC/Pa) because of the electromechanical symmetry of the device. The usable frequency range of the sensor is 0-800 Hz. Keywords: Piezoelectric sensor, shear stress, floating element, electromechanical symmetry
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Kim, Taeyang, Saini, Aditya, Kim, Jinwook, Gopalarathnam, Ashok, Zhu, Yong, Palmieri, Frank L., Wohl, Christopher J., Jiang, Xiaoning. 2016-03-20. A Piezoelectric Shear Stress Sensor. https://ntrs.nasa.gov/citations/20160007836
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