Abstract
This work focuses on evaluating the time-dependent non-linear ferroelastic behaviour of 1-3 piezocomposites under pure uni-axial compressive stress loading condition. An experimental setup is developed to study the influence of high-stress levels on the stress-strain and stress-polarization behaviour of 1-3 piezocomposites. The electro-elastic effective properties of 1-3 piezocomposites are measured experimentally based on IEEE standard and compared with the proposed numerical model using finite-element software ABAQUS. The time-dependent effective properties are evaluated using viscoelastic model and it is incorporated into a 3D micromechanical model to predict the viscoelastic behaviour of 1-3 piezocomposites under mechanical loading. The simulated results are compared with the viscoelastic behaviour of 1-3 piezocomposites obtained from experiments.
Highlights
Piezocomposites are widely used as senors and actuators in aerospace, biomedical and underwater applications due to their enhanced electromechanical coupling characteristics compared to piezoceramics.[1]
The experiments are conducted on various volume fraction of [1,2,3] piezocomposites (80%, 65% and 35% PZT fibers) and bulk piezoceramics to understand the viscoelastic behaviour under pure mechanical loading condition at different loading rates
The homogenized properties obtained from the numerical model is given as input to the viscoelastic model which is derived in section III B, to predict the time-dependent electro-elastic effective properties
Summary
Piezocomposites are widely used as senors and actuators in aerospace, biomedical and underwater applications due to their enhanced electromechanical coupling characteristics compared to piezoceramics.[1]. When mechanical stress applied parallel and perpendicular to the poling axis, it will induce non-linearity as well as permanent deformation and mechanical depolarization. This is due to the reorientation of domains perpendicular to the applied loading direction.[3,4] An efficient poling technique for piezoceramics to be used in actuator applications has been investigated.[5] The resonance based measurement technique is employed to determine the properties of piezoceramics, including determination of mechanical and electrical losses.[6] The viscoelastic properties of polycrystalline ferroelectric ceramics has found to have an influence on the rate at which the cyclic electric field is applied.[7]
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