19 April 2013 Design of a curvature sensor using a flexoelectric material
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Abstract
A curvature sensor based on flexoelectricity using Ba0.64Sr0.36TiO3 (BST) material is proposed and developed in this paper. The working principle of the sensor is based on the flexoelectricity, exhibiting coupling between mechanical strain gradient and electric polarization. A BST curvature sensor is lab prepared using a conventional solid state processing method. The curvature sensing is demonstrated in four point bending tests of the beam under harmonic loads. BST sensors are attached on both side surfaces of an aluminum beam, located symmetrically with respect to its neutral axis. Analyses have shown that the epoxy bonding layer plays a critical role for curvature transfer. Consequently a shear lag effect is taken into account for extracting actual curvature from the sensor measurement. Experimental results demonstrated good linearity from the charge outputs under the frequencies tests and showed a sensor sensitivity of 30.78pC•m in comparison with 32.48pC•m from theoretical prediction. The BST sensor provides a direct curvature measure instead of using traditional strain gage through interpolation and may offer an optional avenue for on-line and in-situ structural health monitoring.
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X. Yan, X. Yan, W. B. Huang, W. B. Huang, S. R. Kwon, S. R. Kwon, S. R. Yang, S. R. Yang, X. N. Jiang, X. N. Jiang, F. G. Yuan, F. G. Yuan, } "Design of a curvature sensor using a flexoelectric material", Proc. SPIE 8692, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2013, 86920N (19 April 2013); doi: 10.1117/12.2009941; https://doi.org/10.1117/12.2009941
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