An investigation on temperature-dependent behaviour of 1-3 piezocomposites is carried out under electro-mechanical coupled loading condition for different fiber volume fractions and bulk piezoceramics. Effective properties of 1-3 piezocomposite are measured using resonance based method for different operating temperatures. A simple homogenization technique is proposed for predicting the effective properties of 1-3 piezocomposites at elevated temperatures. A thermodynamically consistent uni-axial non-linear constitutive model is developed to predict thermo-electro-mechanical behavior of 1-3 piezocomposites. The predicted effective properties are incorporated in the proposed uni-axial model. The responses of piezocomposites subjected to electric field and mechanical stress are calculated and compared with experimental observations for room and elevated temperatures. © 2013 Elsevier B.V.

Arunachalakasi Arockiarajan

Department of Applied Mechanics

EFFECTIVE PROPERTY

Electro-mechanical

ELECTROMECHANICAL RESPONSE

Experimental observation

FIBER VOLUME FRACTIONS

Figure of merit (FOM)

HOMOGENIZATION TECHNIQUES

Operating temperature

Electric fields

HOMOGENIZATION METHOD

Piezoelectric ceramics

Temperature

Thermal effects

stresses

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Sensors and Actuators, A: Physical

A systematic investigation of the stress-dependent non-linear electromechanical properties of 1-3 piezocomposites for different fiber volume fractions and bulk piezoceramics is carried out. Experiments are conducted to measure the electrical displacement and longitudinal strain on piezocomposites and bulk ceramics under uni-axial compressive stress loading conditions. A simplified uni-axial micro-macromechanical model based on thermodynamic framework is developed to predict the behaviour. Volume fractions of three distinct uni-axial variants (instead of six variants) are used as internal variables to describe the microscopic state of the material. In order to calculate the effective properties (elastic, piezoelectric and dielectric constants) of piezocomposites for different fiber volume fractions, an analytical model based on equivalent layered approach is proposed. The predicted effective properties are incorporated into uni-axial model and the classical stress versus strain and stress versus electrical displacement curves are simulated. Comparison between the experiments and simulations show that the proposed model can reproduce the characteristics of non-linear coupled response. It is observed that, the variation in the fiber volume fraction has a significant influence in the response of 1-3 piezocomposites. © 2012 Elsevier Masson SAS. All rights reserved.

European Journal of Mechanics, A/Solids

Experimental and theoretical studies on ferroelastic switching of 1-3 type piezocomposites

Domain switching in piezoelectric materials is caused by external loads such as electric field and stress that leads to non-linear behaviour. A study is carried out to compare the non-linear behaviour of 1-3 piezocomposites with different volume fractions and bulk piezoceramics. Experiments are conducted to measure the electrical displacement and strain on piezocomposites and bulk ceramics under high cyclic electrical loading and constant compressive prestress. A thermodynamically consistent uni-axial framework is developed to predict the nonlinear behaviour by combining the phenomenological and micromechanical techniques. Volume fractions of three distinct uni-axial variants (instead of six variants) are used as internal variables to describe the microscopic state of the material. In this model, the grain boundary effects are taken into account by introducing the back fields (electric field and stress) as non-linear kinematic hardening functions. An analytical model based on equivalent layered approach is used to calculate effective properties such as elastic, piezoelectric, and dielectric constants for different volume fractions of piezocomposites. The predicted effective properties are incorporated in the proposed uni-axial model and the dielectric hysteresis (electrical displacement versus electric field) as well as butterfly curves (strain versus electric field) are simulated. Comparison between the experiments and simulations show that this model can reproduce the characteristics of non-linear response. It is observed that the variation in fiber volume fraction and compressive stress has a significant influence on the response of the 1-3 piezocomposites. © 2013 Elsevier Ltd. All rights reserved.

Fulltext

International Journal of Solids and Structures

Non-linear electromechanical response of 1-3 type piezocomposites

A study is carried out to compare the non-linear behaviour of 1-3 piezocomposites with different volume fractions and bulk piezoceramics. Experiments are conducted to measure the electrical displacement and strain on piezocomposites and ceramics under high cyclic electrical loading. A thermodynamically consistent framework, combining the phenomenological and micromechanical models, is developed to predict the coupled behavior. Volume fractions of three distinct uni-axial variants (instead of six variants) are used as internal variables to describe the microscopic state of the material. In this model, the grain boundary effects are taken into account by introducing the back fields (electric field and stress) as non-linear kinematic hardening functions. In order to calculate the effective properties (elastic, piezoelectric, and dielectric constants) of piezocomposites for different volume fractions, an analytical model based on equivalent layered approach is proposed. The predicted effective properties are incorporated in the proposed model, and the classical hysteresis (electrical displacement versus electric field) as well as butterfly curves (strain versus electric field) is simulated. Comparison between the experiments and the simulations shows that this model can reproduce the characteristics of non-linear coupled response. It is observed that the variation in fiber volume fraction has a significant influence on the response of the 1-3 piezocomposites. © 2012 American Institute of Physics.

Journal of Applied Physics

Modeling of dielectric and piezoelectric response of 1-3 type piezocomposites

A thermodynamically consistent uniaxial model combining the benefits of both phenomenological and micromechanical models is proposed. The driving forces derived from irreversible thermodynamics induce domain switching on reaching certain critical values. The back stress and electric fields, assumed as linear functions of remanent strain and polarization, developed by the domain switching process are introduced to assist or resist further changes in microscopic state of the crystal depending on the loading history. In this model, volume fractions of three distinct uniaxial variants act as internal variables describing the microscopic state of the crystal. Domain switching process for general cases involving two variants and for simultaneous evolution cases where three distinct variants participate the switching process are dealt with. The model is found to reproduce the characteristics of the responses of ferroelectric polycrystals under uniaxial complex electro-mechanical loading cases that are consistent with the experimental observations. © 2009 Elsevier Ltd. All rights reserved.

International Journal of Engineering Science

A thermodynamically consistent model with evolving domain structures in ferroelectrics

Acta Materialia

Temperature-dependent ferroelastic switching of ferroelectric ceramics and evolution of linear material properties

Investigations on non-linear temperature-dependent electro-mechanical response of 1-3 type piezocomposites

Journal	Sensors and Actuators, A: Physical
ISSN	09244247
Open Access	No