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Caractérisation des propriétés électro-acoustiques de structures piézoélectriques soumises à une contrainte statique de type électrique ou mécanique

Abstract : Used in many domains, piezoelectric materials are frequently submitted to external or internal stresses which modify their properties. In order to prevent and anticipate these modifications, this work studies the properties of piezoelectric materials under static electrical or mechanical stress. First, the motion equations of a piezoelectric (non hysteretic) material are developed at the second order taking to account the static strain (caused by the stress) and the dynamic ones (caused by the propagation of an elastic wave). The numerical study of plane wave velocities and coupling coefficients is performed on lithium niobate, in different cuts and different coordinate systems (natural and static). Then, we evaluate in which configurations the application of an electrical or mechanical stress improves or degrades the material properties. In a second part, the hysteretic behaviours of piezoceramic materials under electrical and mechanical stresses are characterized by modelling the evolutions of microscopic remanent polarization and strains through the movements of domain walls. Numerical results are compared to evolutions of 4 piezoceramics from the literature. It allows us to define the validation domain of our hypothesis and to explain hysteretic behaviours of soft and hard piezoceramics. The study of the material constant evolutions shows characteristic behaviours of the different types of piezoceramics, as well as the advantages and limitations of our model. In the last part, an experimental device to measure strains (longitudinal and transversal) and electrical displacements is developped. Measurements are made on lithium niobate and on two piezoceramics (Pz21, a soft composition and Pz26, a hard one) under mechanical stress. Results allow study on lithium niobate to be planned and bring a better understanding of transversal strain evolutions in piezoceramics.
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https://theses.hal.science/tel-00782090
Contributor : Mathieu Domenjoud Connect in order to contact the contributor
Submitted on : Sunday, February 17, 2013 - 8:56:21 PM
Last modification on : Friday, January 14, 2022 - 5:10:02 PM
Long-term archiving on: : Saturday, May 18, 2013 - 4:04:13 AM

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  • HAL Id : tel-00782090, version 2

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Mathieu Domenjoud. Caractérisation des propriétés électro-acoustiques de structures piézoélectriques soumises à une contrainte statique de type électrique ou mécanique. Acoustique [physics.class-ph]. Université François Rabelais - Tours, 2012. Français. ⟨NNT : 2012TOUR4002⟩. ⟨tel-00782090v2⟩

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