Papers by Keyword: Piezoelectric Material

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Authors: Rosa Marat-Mendes, C.J. Dias, José N. Marat-Mendes
181
Authors: Chien Chang Lin, Feng Min Lai, Chen Mao Yang
Abstract: The paper is investigated the polarization properties and mechanical behavior of new piezoelectric polymer material plates by experimental procedures and finite element analysis. In this study, the PVDF materials is used to produce the piezoelectric polymer layer and the coating film, we have provided a nice procedures for manufacturing piezoelectric polymer plates (PVDF). In order to find the proper proportion of the PVDF to achieve the best material properties, the mechanical behavior of displacements and stresses for the electrets is investigated by experimental measurement and finite element analysis (with ANSYS). It is investigated whether the thicknesses of specimens are affected the polarization. The paper is presented modal analysis techniques for piezoelectric thin plates.
33
Authors: Bao Lin Wang, Jie Cai Han
Abstract: This paper investigates a moving crack in a nonhomogeneous piezoelectric material (NPM) plate. The mechanical and electrical properties of the plate are considered for a class of functional forms for which closed-form expressions for the moving crack tip electromechanical fields are obtained. Effect of material non-homogeneity and crack moving velocity on the crack tip fields are discussed. The crack moving velocity can increase or decrease the stress intensity factor. The cleavage stress, τθz, however, is always an increasing function of crack moving velocity.
85
Authors: Jin Xi Liu, X.L. Liu
Abstract: This paper is concerned with the interaction of a piezoelectric screw dislocation with a semi-infinite dielectric crack in a piezoelectric medium with hexagonal symmetry. The solution of the considered problem is obtained from the dislocation solution of a piezoelectric half-plane adjoining a gas medium of dielectric constant ε0 by using the conformal mapping method. The intensity factors of stress, electric displacement and electric field and the image force on the dislocation are given explicitly. The effect of electric boundary conditions on the dislocation-crack interaction is analyzed and discussed in detail. The results show that ε0 only influences the electric displacement and electric field intensity factors and the image force produced by the electric potential jump.
183
Authors: Feng Min Lai, Chien Chang Lin, Chao Chieh Yang, Chun Hsiang Lan, Chen Mao Yang
Abstract: The paper investigats the polarization properties and mechanical behavior of new piezoelectric polymer material plates by experimental procedures and finite element analysis. In this study, the PVDF materials are used to produce the piezoelectric polymer layer and the coating film, we have provided nice procedures for manufacturing piezoelectric polymer plates (PVDF). In order to find the proper proportion of the PVDF to achieve the best material properties, the mechanical behavior of displacements and stresses for the electrets is investigated by experimental measurement and finite element analysis (with ANSYS). It is investigated whether the thicknesses of specimens will affect the polarization. The paper is presented modal analysis techniques for piezoelectric thin plates.
80
Authors: Xiang Hua Guo, Dai Ning Fang
Abstract: In this paper, the moving least-square (MLS) method, one of the most promising meshless methods, is modified to construct whole field meshless approximation for coupled electromechanical problems. Based on this method, the crack propagation behavior and the elasto-electric fields near a crack tip in a PZT-5H piezoelectric ceramic under mechanical, electrical and mechanical-electrical mixed loads are investigated. The numerical results show that for a negative applied electric field, the hoop stress will be maximum at a certain angle other than 00 when the ratio of the electric field to tensile stress is relatively high, which makes the crack turn away from its original growth path.
543
Authors: Shu Hong Liu, Z.Z. Zou, B.Q. Xu, Z.G. Zhang
Abstract: The problem of an interface edge crack between two dissimilar piezoelectric materials is analyzed under the conditions of anti-plane shear and in-plane electrical loading. The crack is considered to be traction-free, but electric permeable one across which the normal component of the electric displacement are continuous. A series form of electromechanical solution and field intensity factors are obtained. The results show that all fields including strain, stress, electric field strength and electric displacement are singular in the front of crack tip. At last, the stress intensity factor is solved by the boundary collocation method (BCM), numerical results are given and discussed.
471
Authors: Sergio Ricardo Kokay Morikawa, Daniel Pontes Lannes, Antonio Lopes Gama
Abstract: This paper presents the results of an experimental investigation on the use of piezoelectric materials as a technique for monitoring the growth of defects in structures. The method consists of exciting the structure with piezoelectric actuators while recording the electromechanical responses from sensors placed close to the defect. The piezoelectric sensors detect the damage growth or an incipient defect by monitoring changes in the dynamic strain field, induced by the piezoelectric actuator, near the defect. This technique was evaluated through experiments using an aluminum frame structure. Results show that the piezoelectric active method is capable of detecting small changes in defect depth.
113
Authors: Karsten Wippler, Meinhard Kuna
Abstract: A general purpose direct BEM code has been developed for three-dimensional crack problems in piezoelectric structures. Special 3D non-continuous crack tip elements and several techniques for determining crack tip parameters were implemented. To calculate the electromechanical energy release rate for a virtual crack extension, the θ-method is employed, which was originally suggested by BONNET for linear elastic materials. The paper presents the generalization and numerical realization of the θ-method to 3D piezoelectric cracks. The great advantage of the θ-method is the direct computation of energy release rate, whereas the way via K-factors and the IRWIN matrix is more complicated. The efficiency and accuracy of the technique are shown for various example problems by comparing with analytical solutions.
363
Authors: He Guo Liu, Jun Lei, Peng Bo Sun, Qing Sheng Yang
Abstract: In this paper, an interaction integral is applied to evaluate the crack-tip field intensity factors for piezoelectric cracks by using BEM. Based on this, the fracture parameters for different crack configurations and loading conditions are analyzed in details for both the center crack and edge crack problem. According to the present results, the path-independent behavior of the interaction integral is verified. The comparison of the I-integral results with those by the J-integral and the displacement interpolating methods shows a good agreement.
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