Papers by Keyword: Magnetostriction

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Authors: Bo Wen Wang, Zhi Hua Wang, Yan Ming Hao, Yu Fa Yi, Ling Weng, Wen Mei Huang
Abstract: The Tb0.3Dy0.7Fe2 <110> oriented alloy was grown by zone melting directional solidification technique. The strain-stress loops of the alloy in different magnetic fields have been measured, and the effect of stress and magnetic field on strain difference Dε has been confirmed. It is found that the strain difference Dε quickly increases with increasing the stress when the stress is less than 10 MPa and decreases in the range of 10-40 MPa when the magnetic field is in the range of 30-40 kA/m. The result indicates that the magnetic field and stress have a marked effect on the strain hysteresis of the Tb0.3Dy0.7Fe2 <110> oriented alloy and the hysteresis property of stress-strain relation should be considered during the design of magnetostrictive sensors.
490
Authors: Ming Li
Abstract: A more exact general analytical formula of preditcting the magnetostrictive coefficient is derived for any aspect ratio based the deflection difference between the x and y directions. The curvatures are found by minimizing the total energy of the system, which taking into account shear strain energy. The in-plane stress distribution including shear stress for short specimen is also given by the ANSYS® finite element package to illustrate the role of shear strain in the deformation of magnetostrictive film-substrate system.
552
Authors: Ming Li, Hui Ming Zheng
Abstract: Recently, the inconsistencies are pointed out by previous authors for the problem of finding the strains, stresses and energy densities observed in isotropic elastic magnetostrictive materials that are in the form of thin films deposited on non-magnetic substrates. We discuss the reason of such inconsistencies that the total normal stresses should be the sum of the stresses caused by the external mechanical force and magnetic field. We show that such a situation can be realized in many of the current models used to make predictions for magnetostrictive structures and the inconsistencies can be explained.
100
Authors: Cheng Bao Jiang, Li Hong Xu, Tian Li Zhang, Tian Yu Ma
Abstract: Co and Si were selected as substitutes to improve performance of TbDyFe giant magnetostrictive alloys for special purpose, respectively. The results showed that the Co-doped Tb0.36Dy0.64Fe2 alloys can possess giant magnetostriction over a wide temperature range from -80 to 100 . Optimum magnetostriction, high electrical resistivity and improved corrosion resistance was obtained in Tb0.3Dy0.7(Fe1-xSix)1.95 system. High performance grain-aligned rods with <110> preferred orientation have been successfully prepared by zone melting unidirectional solidification. This paper also presents the design and fabrication of Giant Magnetostrictive Actuator (GMA) for active vibration control with oriented TbDyFe rods. Experimental results showed that the GMA possesses good static and dynamic performance. Excellent damping effect, 20-30 dB under the frequency range from 10 Hz to 120 Hz was obtained.
2143
Authors: I. Bica, Maria Balasoiu, A.I. Kuklin
Abstract: Results on anisotropic magnetorheological elastomers magnetoelasticity are presented and discussed. In the dipole approximation, and considering the MRE as a continuous linear body, the effects of magnetic field on its main elastic properties (linear deformations and Young module) are investigated. Experimental evidences that the compression of the cylindrical bar is influenced by the intensity of the longitudinal magnetic field and the Young module of the MRE sample increases with the intensity H of the longitudinal magnetic field are obtained and the results discussed.
645
Authors: Zhang Meng, Yan Wen, Li Tao, Jiang Wei, Wang Shuai
Abstract: Introducing the principle, which the magnetostrictive displacement sensor is based on, and the gauging to small shifting is given in this paper. These sensor possess the peculiarities of high precision, long-life and easy to assemble. The gauging to small shifting belongs to the major characteristics test to artillery. On account of the faultiness existing testing means, this method is submitted to the characteristics test of artillery. Which magnetostrictive displacement sensor is applied to the shifting measure. By means of tests, the conclusion could be given that this method is easy to operate, automatic, high testing precision and widely used.
99
Authors: E.V. Harin, E.N. Sheftel’, A.I. Krikunov
Abstract: A method for direct measuring the magnetostriction of ferromagnetic films (deposited on nonmagnetic substrates) in using an atomic force microscope was suggested. In measuring the magnetostriction for films 10 [mm] in length and 0,2 [μm] in thickness, which were deposited on substrates 200 [μm] thick, the minimum measured magnetostriction magnitude is ~10-7. The procedure was tested for Ni and Fe films. The magnetostriction magnitudes measured for the films are comparable with those obtained by other magnetostriction-measuring methods. The effect of alloying with zirconium and nitrogen on the magnetostriction of nanocrystalline Fe films was studied.
179
Authors: K.S. Ryu, J.S. Park, Cheol Gi Kim, Youn Ho Cho, Derac Son
353
Authors: Yusuke Onuki, Ryuji Ukai, Shigeo Sato, Shun Fujieda, Kozo Shinoda, Kentaro Kajiwara, Masugu Sato, Shigeru Suzuki
Abstract: Fe-Ga alloys show large magnetostriction, which strongly depends on crystal orientation. This phenomenon is associated to some degree with large elastic anisotropy. In this study, white X-ray diffraction with micro-beam synchrotron radiation was used to evaluate the microscopic stresses evolved in a polycrystalline Fe-Ga alloy under tensile loading. In the analysis, the large elastic anisotropy of the Fe-Ga alloy was focused. The stress distribution in the alloy microstructure under tensile loading was estimated using a finite element method (FEM) simulation that considered the dependence of the elasticity on the crystal orientation. The crystal orientation of grains in the polycrystalline Fe-Ga alloy was measured using electron backscatter diffraction. The FEM simulation showed that the stress distribution in the microstructure depended on the crystal orientation. The X-ray diffraction stress analysis indicated that under tensile loading, the stresses in the alloy depended on the crystal orientation. This finding is similar to the results obtained from the FEM simulation, although the absolute values of the stresses may have reflected the effects of heterogeneous deformation on the stress distribution.
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