巨磁致伸缩材料Terfenol-D的磁致伸缩计算

摘要

考虑在压应力作用下磁畴的择优分布，应用磁畴转动模型，建立了在压应 力作用下材料的磁致伸缩与磁场强度的关系．当H≤80 kA/m、在较大压应力作用 下时，计算结果与实验值基本符合．表明该表达式反映了在压应力作用下磁化机 制，可以应用该式来描述材料在较低磁场强度下的磁致伸缩%A expression between magnetostriction and magnetic fields un der applied stress was founded by considering the aligned orientation contribution of magnetic domains under applied stress and using the tu rning model of magnetic domains. The result of calculation is primaril y in agreement with that of experiments when ≤ 80 kA/m and 　 = 21 M Pa.This indicates that the expression reflects the magnetic mechanism of Terfenol-D and it can be used to describe the relation between magn etostriction and magnetic fields under low magnetic fields and high ap plied stress.