关键词: 叠层复合材料/
磁电效应/
压电效应/
磁电系数
English Abstract
Magnetoelectric effect analysis of magnetostrictive/piezoelectric laminated composites
Zhou Yong1,2,Li Chun-Jian1,
Pan Yu-Rong1
1.Nanjing University of Information Science and Technology, Nanjing 210044, China;
2.Jiangsu Technology Engineering Center of Meteorological Sensor Network, Nanjing 210044, China
Fund Project:Project supported by the National Natural Science Foundation of China (Grant No. 61601231), Natural Science Foundation of Jiangsu Province, China (Grant No. BK20140999), and the Open Fund of Jiangsu Technology and Engineering Center of Meteorological Sensor Network, China (Grant No. KDXG1302).Received Date:25 October 2017
Accepted Date:19 January 2018
Published Online:05 April 2018
Abstract:Based on the finite element analysis software COMSOL5.0,a three-dimensional (3D) model of cantilever beam composed of magnetostrictive/piezoelectric/magnetostrictive laminated composites is established using the piezoelectric module and magnetic field module.The magneto electro coupling coefficient αME of the composite is analyzed.The effect of geometrical parameter on magnetoelectric coefficient is studied,and the geometrical parameters are optimized. Firstly,the stress,strain,displacement and potential distributions of the magnetoelectric layered structure are analyzed by the steady-state solver.The stress and strain concentrate on the fixed terminal while the maximum displacement exists in the free end of the structure.As a result,the potential appears between the upper and lower surface of the piezoelectric layer and the voltage distribution is not uniform.The output voltage in the fixed terminal is larger than that in the free end,which is about 49 V compared with 42 V in the free end.And the dynamic distributions of various variables in magnetoelectric composite structure are analyzed by transient solution.Secondly,the resonance frequency of the structure and the influence of the bias magnetic field on the output voltage are studied by small signal analysis in frequency domain.The results show that the output voltage decreases with the increase of Hdc.Also,the maximum output voltage is about 3.36 V at the second-order resonance frequency,which is far higher than the voltage at the first-order resonant frequency in the condition of bias magnetic fields Hdc=200 Oe and alternating magnetic fields Hac=1 Oe.The reason is that the composite structure has a larger deformation at the second-order resonance frequency.Furthermore,the effect of thickness ratio between magnetostrictive and piezoelectric layers tm/tp on coupling coefficient is analyzed by changing the thickness of magnetostrictive layer and piezoelectric layer,respectively.The results show that the magnetoelectric coefficient increases with the augment of the thickness ratio,but the increasing rate decreases gradually.The research also shows that it has a greater influence on magnetoelectric coefficient to change tp rather than tm.Finally,the variations of magnetoelectric coefficient with the area of composite structure and the aspect ratio are analyzed.The results show that the magnetoelectric coefficient increases gradually with the augment of magnetoelectric composite area,but the increasing rate declines gradually.With the constant composite area,the magnetoelectric coefficient first increases and then drops with the increase of aspect ratio L/W,demonstrating the existence of an optimized value.Besides,the width W acts more importantly than length L because strain concentrates on the fixed terminal along
Keywords: laminated composite materials/
magnetoelectric effect/
piezoelectric effect/
magnetoelectric coefficient
