外应力对Terfenol-D棒的应变和磁感应强度的影响

超磁致伸缩材料Terfenol-D是一种新型的功能材料,以Terfenol-D为核心元件设计各种换能器时,磁场H和应力σ是必须考虑的因素.研究了一定偏置磁场下外加压应力对Terfenol-D棒的应变和磁感应强度的影响.首先测试了在一定的偏置磁场下外压应力和应变的关系,结果表明偏置磁场一定时,应变和应力之间的关系复杂,可用磁性材料技术磁化理论来解释.其次又测试了一定偏置磁场下的外加动态应力和磁感应强度的关系,测试结果表明一定的偏置磁场下,外加压应力增加,磁感应强度减小;偏置磁场为5kA/m时,磁感应强度达到最大值.该实验结果可以为基于Terfenol-D的换能器件的设计提供技术支持.

Effect of stress on the strain and magnetic induction of Terfenol-D rod

Giant magnetostrictive material Terfenol-D is a new function material. Both the magnetic field and stress would be considered, when a magnetostrictive transducer is designed. The paper presents the effect of the stress on the strain and the magnetic induction of Terfenol-D rod in variable bias magnetic fields. The stress and strain in variable bias magnetic fields were measured, the results show that the relationship of them in different magnetic fields is complex and can be explained with the magnetic domains theory of the magnetic materials. The relative magnetic permeability dependence of the magnetic field under different stress show that the relative magnetic permeability varies quickly especially in low magnetic field, so it is necessary to measure the stress and the magnetic induction in different magnetic fields. The results show that the magnetic induction decrease with the increasing of the stress in a bias magnetic field, when the magnetic field is 5kA/m, the magnetic induction is maximum. The experiment results can guide the design for the magnetostrictive transducer based on Terfenol- D.