The Performance Of The Magnetoelectric Composite Materials Research And Its Finite Element Analysis

In the modern life and production, the requirements of miniaturization in device and diversification in function get higher. In order to meet people’s high requirements, looking for the intelligent materials has become the focus. One of the typical representativeness is multiferroic material, which both have ferroelectric and ferromagnetic properties. And there exists coupling effect between them. The coupling effect is called Magnetoelectricity effect. Magnetoelectric material which is a kind of novel multifunctional material has many potential applications such as magnetoelectric transducer, magnetoelectric conversion tester, magnetoelectricity conversion instrument, microwave devices and so on. Based on the recent work, this thesis aims to construct a new Rosen-type piezoelectric transformer and Terfenol-D laminated composite to get a high magnetoelectric performance and further more use the finite element analysis software:ANSYS to simulate the experiment process to get a thorough research.First, based on the study of the theory on layer magnetoelectricity composites, we obtained the constitutive equation magnetoelectricity coupling, the kinematics equations of laminated samples, circuit state equation, magneto-machinery equivalent circuit diagram and the magnetoelectric coupling coefficient in low frequency with the theoretical analysis. The results of the analysis play a directive function in the research of the magnetoelectricity samples and structure optimization.Second, researching the converse magnetoelectricity property of Rosen-type piezoelectric transformer/Terfenol-D double structure magnetoelectricity materials that obtained the change rule of CME property with bias magnetic field, voltage frequency and different position on the sample surface and get the half and full resonance frequency and the best bias magnetic field. through testing we found that all of them have a good rule and inverse magnetoelectricity performance.Third, we use ANSYS finite element analysis software to simulate the experimental process of the magnetoelectric composite material. Firstly, design a PZT transformer and simulate the vibrate performance. Comparing with the real experiment have little error and simulate the piezoelectric transformer/Terfenol Rosen-D structure magnetoelectricity material and get the rule of magnetoelectric coefficient change by bias magnetic field and the resonant frequency. At the same time and the result of the experiment was very good consistency. This result has a great help to the process of further exploring of useful device.