The magnetostriction in Tb0.3Dy0.7Fe1.95 alloys under two types of magnetomechanical loading
The magnetostriction has been studied in detail for the positive magnetostrictive material of Terfenol-D under two types of magnetomechanical loading. Under the application of the axial magnetic field and the axial compressive stress, the amplitude of the axial magnetostriction is improved as the stress increases due to the fact that the magnetic domains are driven to rotate away from the axis before magnetization. And the negative magnetostriction appears when the magnetic field increases to coercive field, the shape of which is similar with the butterfly hysteresis in PZT. However under the application of the transversal magnetic field and the axial compressive stress, the amplitude of the axial magnetostriction decreases as the stress increases. Almost no axial magnetostriction is observed when the compressive stress is high enough, which reflects the domain rotation mechanism. The different behaviors in two types magnetomechanical spaces can be explained by the different roles of the magnetic fields in the domain rotation process. The stress tries to align the domain perpendicular to the rod axis. In the first type magnetomechanical space, there is a competition between the axial magnetic field and the axial compressive stress, because the magnetic field attempts to align the domain along the rod axis. However, in the second type magnetomechanical space, the transversal magnetic field will lead to the domain rotation away from the rod axis.
Yong-mao Pei Dai-ning Fang
Department of Engineering Mechanks, Tsinghua University, Beijing 100084, China
国际会议
The 5th International Conference on Nonlinear Mechanics(第五届国际非线性力学会议)
上海
英文
1611-1614
2007-06-11（万方平台首次上网日期，不代表论文的发表时间）