The Research On Mechanical Behavior Of Magnetostrictive Materials In High-frequency Driven

This paper puts Terefenol-D material as the main research object. Workingcharacteristics and the radial diatribution characteristics of internal stress and strain ofTerfenol-D rod in high-frequency driven have been analyzed with the method of finiteelement analysis. The research purpose and meaning of this topic is:(1)Looking for the method of solving internal deformation and stress and strainfield distribution of Terfenol-D rod in high-frequency driven,which provides methodand theory of studying high-frequency performance of giant magnetostrictive material.(2)Striving to establish the parametric model of internal stress distribution of andstudying the mechanical behaviors of magnetostrictive materials in th high frequencydriven,which provides the theory basis for the reasonable application of giantmagnetostrictive material.(3)Developing general APDL simulation progiam,which provides pratical mehtodsto solve the problems of high frequency magnetostrictive dynamics.This paper proceeds the research work mainly in the following several aspects:Putting the magnetostrictive phenomenon and its application mechanism as thepoint,which expounds systematicalling the following characteristics of rare earth giantmagnetostrictive material:①Jump effect②Temperature effect③ΔEeffect④Eddycurrent effect⑤Times frequency effect.Basing on the understanding of the abovecharacteristics,we can use the giant magnetostrictive material more reasonably andefficiently.This paper describes the research situation at home and abroad of giantmagnetostrictive material systematically.Finite element analysis and ANSYS softwareand the finite element theory with the subject are introduced briefly.The mechanicalbehaviors of Terfenol-D rod in high-frequency driven are analyzed using temperaturestress-magnetostrictive stress analogy method and ANSYS software.The radialdistribution of internal stress and strain and the output of the diaplacement ofTerfenol-D rod in the thermal-structure coupling field are won.Analysis shows that: theTerfenol-D rod produces eddy current and hasten skin effect in the high frequencyalternating magnetic field driven. Internal magnetic field produced by the alternatingcurrent is offsetted by the eddy current magnetic field and distributed uneven along theradial direction,which lead to than internal stress and strain are distributed nueven alongthe radial direction of Terfenol-D rod. Ducing to that the incentive load is sinusoidalalternating voltage, the magnetic firld should also be sinusoidal alternating magnetic field and the frequency of magnetic field is the same as the frequency of alternatingvoltage. Terfenol-D rod produces elongation(or shorten) in the sinusoidal alternatingmagnetic field driven, also is the magnetostrictive movement. Therefore, thelongitudinal displacement and the narmal stress of the Y direction produced byTerfenol-D rod have vibration trend with the change of time. The radial distribution ofequivalent stress of Terfenol-D rod is that the cantral stress is large and the edge stressis small. The radial distribution of equivalent strain of Terfenol-D rod is that the cantralstress is small and the edge strain is large. Basing on that the above conclusions are theconsistent with theory, the numerical simulation of magnetostrictive effect with thetemperature-magnetostrictive analogy method is feasible. The algorithm theoryproblems solves the radial distribution of internal stress ang strain of magnetostrictivematerial, which opens the new use of ANSYS, develops the special APDL programfor the simulation of magnetostricitve effect, provides theory basis for the optimizationdesign of magnetostrictive material application device.