Magnetoelectric (ME) composite structures have a wide range of applications in various industries due to the presence of ME coupling behavior. In the present work, ME coupling behavior is accounted for by considering mechanically bonded ferroelectric and magnetostrictive phases. Firstly, the rate dependent behaviors of ferroic phases are observed by performing experimental investigations at room temperature. To depict the response of ferroic materials, thermodynamically consistent model is proposed. In order to account for the rate dependent behavior, a penalty function is introduced. Simulation studies have been performed by obtaining model parameters from the experimental studies and results are presented. Simulated results are in good agreement with the experimental data. This work is further extended to capture the response of ME composites by employing a simple homogenization technique. Mechanical, electrical and ME coupling behavior of ME composites are characterized in terms of effect of the volume fraction of the ferroic phases. © 2017 Elsevier B.V.

Arunachalakasi Arockiarajan

Department of Applied Mechanics

Sk M. Subhani

Actuators

Sensors

ELECTROMECHANICAL RESPONSE

Experimental investigations

HOMOGENIZATION TECHNIQUES

INTERNAL VARIABLES

Magnetoelectric

MAGNETOELECTRIC COMPOSITES

RATE-DEPENDENT BEHAVIORS

YIELD FUNCTION

HOMOGENIZATION METHOD

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

In this work, experiments have been performed to study the magneto-mechanical behaviour of (Tb0.3Dy0.7Fe2) under various operating temperatures. Based on the experimental results, a three dimensional nonlinear constitutive model under thermodynamic framework have been developed to capture the thermo-magneto-mechanically coupled behaviour. Then, the model parameters have been identified using least square approximation. Later, using the developed model, a homogenisation procedure has been introduced to simulate magnetoelectric (ME) coupling behaviour for various temperature and volume ratio of composition for different configurations (T-T, L-T, T-L, L-L) in layered ME composites. In a particular configuration (say L-T) is represented by referring first letter (L) as the direction of external magnetic field and the second letter (T) as the direction of polling in the piezoelectric material. Consequently, an experimental setup has been established to capture the ME voltage coefficient at L-T mode under different operating temperatures. Comparison between the experimental data and the simulation results shows good agreement with each other. Comparing the ME coupling behaviour for various configurations, L-L and L-T configurations are observed to have higher coupling factor. © 2018 Elsevier Ltd

Mechanics of Materials

Theoretical and experimental analysis of temperature dependent nonlinear behaviour of tri-layered magnetoelectric composites

Composite structures which show magneto-electric (ME) coupling behavior have a wide range of engineering applications. In this work, a composite structure comprising of a ferroelectric and a magnetostrictive material is taken for investigation. First, the nonlinear responses of the ferroelectric material and the magnetostrictive material are studied separately by experiments. In order to predict the nonlinear response, a thermodynamically consistent macroscopic model is proposed for the ferroic materials. Model parameters are then estimated from the experimental data, and the simulated results based on the proposed model are presented. Results from the theoretical model are in agreement with the experimental data. Subsequently, a homogenization procedure is introduced to find out the nonlinear response of a layered ME composite structure, and the obtained results are discussed. © 2017, Springer-Verlag Wien.

Acta Mechanica

Nonlinear magneto-electro-mechanical response of layered magneto-electric composites: theoretical and experimental approach

The effect of loading rate on ferroelectric and ferroelastic behavior of 1-3 piezocomposites is presented in this work. Experiments are conducted for various loading rates under different loading conditions such as electrical and electromechanical to measure the rate dependent response of 1-3 piezocomposite compared with bulk piezoceramics. A thermodynamic based rate dependent domain switching criteria has been proposed to predict the ferroelectric and ferroelastic behavior of homogenized 1-3 piezocomposites. In this model, volume fraction of six distinct uni-axial variants are used as internal variables to describe the microscopic state of the material. Plasticity based kinematic hardening parameter is introduced as a function of internal variables to describe the grain boundary effects. Homogenization of 1-3 piezocomposite material properties are obtained by finite element (FE) resonator models using commercially available FE tool Abaqus. To evaluate the possible modes of vibration of 1-3 piezocomposite four different configuration of FE resonators are modeled. The FE resonator model is validated with the impedance spectra obtained experimentally for length extensional and thickness extensional resonator models. The predicted effective properties using the resonance based technique are incorporated in the proposed rate dependent macromechanical model to study the behavior of 1-3 piezocomposites. The simulated results are compared with the experimental observations. © 2016 IOP Publishing Ltd.

Smart Materials and Structures

Nonlinear modeling on rate dependent ferroelectric and ferroelastic response of 1-3 piezocomposites

Further development and design of piezoelectric composites enhances the improved use of piezoelectric materials and devices by overcoming their brittleness. In order to engineer this class of materials and to predictably simulate its behaviour, a computationally efficient constitutive model is established in this paper. This contribution deals with the development of a model for piezoelectric composites to capture their effective behaviour. We first discuss a three-dimensional fully coupled electromechanical rate-dependent model for the response of ferroelectric ceramics. Secondly, a simple homogenisation approach is applied to capture the behaviour of composites for various volume fractions of PZT fibres under different loading frequencies. Following this, a finite element formulation is applied in order to study the behaviour of composites. Finally, these two approaches are compared with experimental results. © 2015 Elsevier Ltd.

Experimental investigation, modelling and simulation of rate-dependent response of 1-3 ferroelectric composites

An analytical model based on equivalent layered approach based on iso-field assumptions is proposed to evaluate the effective properties of layered multi-ferroic composites where three phases (piezoelectric, piezomagnetic and epoxy) are considered for homogenization. Also, a finite element (FE) analysis with periodic boundary conditions is carried out in the present work to determine the effective properties of multiferroics wherein interphase and geometric (shape and position) properties are considered. The simulated results based on the proposed analytical and numerical models are compared with exact matrix method available in the literature. Experiments are performed on multiferroic composites under magnetic loading to measure magneto-electric (ME) coupling constant and the results are compared with the simulated results. A parametric study is conducted to investigate the variations of the overall material behavior of layered composite with respect to piezoelectric and piezomagnetic poling/orientation directions. The outcome of the present study demonstrates the influence of poling and orientation of individual constituents on effective properties of multiferroic composites. © 2015 Elsevier B.V.

Journal	Data powered by TypesetSensors and Actuators, A: Physical
Publisher	Data powered by TypesetElsevier B.V.
ISSN	09244247
Open Access	No