Numerical Evaluation of Effective Properties of PZT-5A/Epoxy Smart Piezoelectric Composite (original) (raw)
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High-field behavior of piezoelectric fiber composites
2003
This paper analyses strain and polarisation responses of 1-3 composites, which are related to the fibre and matrix properties. The validity of equations that predict the strain and polarisation of fibres from composite responses, and associated errors at high electric driving fields, are discussed. Surface profile measurements of single PZT rods in a polymer matrix, subjected to a static voltage, were made to investigate the effect of fibre aspect (diameter to length) ratio. Surface profiles, which show the active PZT rod extending from the passive polymer matrix, agree well with predictions made using finite element analysis. The results show that for a 1-3 composite to be treated as a homogeneous medium the fibre aspect ratio needs to be low. Commercially available PZT-5A composition fibres fabricated using four production methods were incorporated into 1-3 composites with fibre volume fractions ranging from 0.02 to 0.72, and with various aspect ratios, were evaluated. Strain-field and polarisation-field curves for the composites were obtained by testing the composites under electrical field cycles of ±2 kVmm-1. From these curves the strain and polarisation response of the fibres have been extracted using appropriate analytical equations. The saturation strain, saturation polarisation and coercive field values are reported for the four fibre types. The Viscous Plastic Process (VPP) and Viscous Suspension Spun (VSSP) fibres develop strains of approximately 4000 ppm. Reduced piezoelectric activity is seen in extruded fibres, which develop strains of 3000 ppm.
Numerical and analytical analyses for active fiber composite piezoelectric composite materials
Journal of Intelligent Material Systems and Structures, 2014
This work consists of the calculation of the effective properties for Active Fiber Composites (AFCs) made of either circular or square cross-section fibers not only by using Finite Element Analysis (FEA) and Representative Volume Elements (RVE), but also based on Asymptotic Homogenization Method (AHM). Thus, there is an investigation about different approaches, which have specific mathematical formulations and unique characteristics. The comparison between numerical and analytical approaches shows that the numerical results are in good agreement with investigations performed by both analytical and semi-analytical methods (SAM), mainly the predictions for loading applied in fiber direction. For AFC made of circular cross-section fibers, the maximum difference between AHM and FEA is from 1.29% to 5.49% for mechanical and piezoelectric effective properties, respectively, considering RVE in square arrangement. However, for AFC made of square cross-section fibers, the maximum difference between SAM and FEA is from 2.15% to 17.09% for mechanical and piezoelectric effective properties, respectively, considering RVE in square arrangement.
High field behaviour of piezoelectric fibre composites
2003
This paper analyses strain and polarisation responses of 1-3 composites, which are related to the fibre and matrix properties. The validity of equations that predict the strain and polarisation of fibres from composite responses, and associated errors at high electric driving fields, are discussed. Surface profile measurements of single PZT rods in a polymer matrix, subjected to a static voltage, were made to investigate the effect of fibre aspect (diameter to length) ratio. Surface profiles, which show the active PZT rod extending from the passive polymer matrix, agree well with predictions made using finite element analysis. The results show that for a 1-3 composite to be treated as a homogeneous medium the fibre aspect ratio needs to be low. Commercially available PZT-5A composition fibres fabricated using four production methods were incorporated into 1-3 composites with fibre volume fractions ranging from 0.02 to 0.72, and with various aspect ratios, were evaluated. Strain-field and polarisation-field curves for the composites were obtained by testing the composites under electrical field cycles of ±2 kVmm-1. From these curves the strain and polarisation response of the fibres have been extracted using appropriate analytical equations. The saturation strain, saturation polarisation and coercive field values are reported for the four fibre types. The Viscous Plastic Process (VPP) and Viscous Suspension Spun (VSSP) fibres develop strains of approximately 4000 ppm. Reduced piezoelectric activity is seen in extruded fibres, which develop strains of 3000 ppm.
High-field behavior of piezoelectric fiber composites
Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics, 2003
This paper analyses strain and polarisation responses of 1-3 composites, which are related to the fibre and matrix properties. The validity of equations that predict the strain and polarisation of fibres from composite responses, and associated errors at high electric driving fields, are discussed. Surface profile measurements of single PZT rods in a polymer matrix, subjected to a static voltage, were made to investigate the effect of fibre aspect (diameter to length) ratio. Surface profiles, which show the active PZT rod extending from the passive polymer matrix, agree well with predictions made using finite element analysis. The results show that for a 1-3 composite to be treated as a homogeneous medium the fibre aspect ratio needs to be low. Commercially available PZT-5A composition fibres fabricated using four production methods were incorporated into 1-3 composites with fibre volume fractions ranging from 0.02 to 0.72, and with various aspect ratios, were evaluated. Strain-field and polarisation-field curves for the composites were obtained by testing the composites under electrical field cycles of ±2 kVmm -1 . From these curves the strain and polarisation response of the fibres have been extracted using appropriate analytical equations. The saturation strain, saturation polarisation and coercive field values are reported for the four fibre types. The Viscous Plastic Process (VPP) and Viscous Suspension Spun (VSSP) fibres develop strains of approximately 4000 ppm. Reduced piezoelectric activity is seen in extruded fibres, which develop strains of 3000 ppm.
Great progress has been made over the past decade in the field of smart materials and structures, which are capable of self monitoring and/or self-adapting, by using bonded or embedded sensors and actuators with the control systems. Piezoelectric Fiber Composites (PFC) is one such smart material. They were previously introduced as an alternative to monolithic piezoelectric ceramics. The present paper serves to provide information on the production and design of piezoelectric composite materials. The developed fabrication process lead to unidirectional segmented PFC. Each piezocomposite segment with metallic ends is separated with a polymeric joint. The structure studied here is a beam equipped with two inserts contain N segments on its upper and lower faces. A FEM model is developed using ANSYS® program to predict the effective electromechanical coupling coefficient of the studied beam. This model is used to examine the trends of piezocomposite properties versus the three main param...
International Journal of Solids and Structures, 2005
The present work deals with the modeling of 1-3 periodic composites made of piezoceramic (PZT) fibers embedded in a soft non-piezoelectric matrix (polymer). We especially focus on predicting the effective coefficients of periodic transversely isotropic piezoelectric fiber composites using representative volume element method (unit cell method). In this paper the focus is on square arrangements of cylindrical fibers in the composite. Two ways for calculating the effective coefficients are presented, an analytical and a numerical approach. The analytical solution is based on the asymptotic homogenization method (AHM) and for the numerical approach the finite element method (FEM) is used. Special attention is given on definition of appropriate boundary conditions for the unit cell to ensure periodicity. With the two introduced methods the effective coefficients were calculated for different fiber volume fractions. Finally the results are compared and discussed.
Ceramics International, 2017
In this paper, we present a method to create a highly sensitive piezoelectric quasi 1-3 composite using a thermoplastic material filled with a piezoelectric powder. An up-scalable hightemperature dielectrophoresis (DEP) process is used to manufacture the quasi 1-3 piezoelectric polymer-ceramic composites. For this work, thermoplastic cyclic butylene terephthalate (CBT) is used as a polymer matrix and PZT (lead zirconium titanate) ceramic powder is chosen as the piezoelectric active filler material. At high temperatures, the polymer is melted to provide a liquid medium to align the piezoelectric particles using the DEP process inside the molten matrix. The resulting distribution of aligned particles is frozen upon cooling the composite down to room temperature in as little as 10 min. A maximum piezoelectric voltage sensitivity (g33) value of 54 ± 4 mV•m/N is reported for the composite with 10 vol% PZT, which is twice the value calculated for PZT based ceramics.
Transstellar Journals, 2020
In this paper, modified strength of materials (MSM) and strain energy-based approach have been used to determine effective electro-mechanical properties of piezoelectric fiber reinforced composites (PFRC). Based upon these methods, micromechanics model has been formulated using a rectangular representative volume element (RVE) which contains both fiber as well as matrix phases. Result obtained has been compared with strength of materials (SM) approach to the similar problems available in literatures. Results suggest that there is wide variation in estimation of properties obtained through strength of materials method to the methods adopted in this work. Strength of materials (SM) method in most of cases overestimates or underestimates the actual result. Though each of such approaches has its own limitations, the adopted method in this paper refines result obtained through strength of materials (SM), as it takes into account of the several conditions, which has not been dealt while analysing with strength of materials method. Both modified strength of materials and energy approach reduces aberration generated in result, due to generation of unequal strain in matrix and fiber phases as well as Poisson's ratio mismatch between fiber and matrix phases.
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A previous study on the characterization of effective material properties of a d 15 thicknessshear piezoelectric Macro-Fibre Composite (MFC) made of seven layers (Kapton, Acrylic, Electrode, Piezoceramic Fibre and Epoxy Composite, Electrode, Acrylic, Kapton) using a finite element homogenization method has shown that the packaging reduces significantly the shear stiffness of the piezoceramic material and, thus, leads to significantly smaller effective electromechanical coupling coefficient k 15 and piezoelectric stress constant e 15 when compared to the piezoceramic fibre properties. Therefore, the main objective of this work is to perform a parametric analysis in which the effect of the variations of fibre volume fraction, Epoxy elastic modulus, electrode thickness and active layer thickness on the MFC effective material properties is evaluated. Results indicate that an effective d 15 MFC should use relatively thick fibres having relatively high shear modulus and relatively stiff epoxy filler. On the other hand, the electrode thickness does not affect significantly the MFC performance. This work presented a parametric analysis of the effective material properties of a d 15 thickness-shear piezoelectric Macro-J. of the Braz. Soc. of Mech. Sci. & Eng.
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Acta Materialia, 2004
A new modeling approach is proposed for predicting the bulk electromechanical properties of piezoelectric composites. The proposed model offers the same level of convenience as the well-known Mori-Tanaka method. In addition, it is shown to yield predicted properties that are, in most cases, more accurate or equally as accurate as the Mori-Tanaka scheme. In particular, the proposed method is used to determine the electromechanical properties of four piezoelectric polymer composite materials as a function of inclusion volume fraction. The predicted properties are compared to those calculated using the Mori-Tanaka and finite element methods.