An examination of Galfenol mechanical–magnetic coupling coefficients
An examination of Galfenol mechanical–magnetic coupling coefficients
复制标题
DOI：
10.1088/0964-1726/20/7/075008
复制
发表时间：
2011-07
影响因子：
4.1
通讯作者：
J. Yoo;G. Pelligrini;S. Datta;A. Flatau
中科院分区：
文献类型：
--
作者：
J. Yoo;G. Pelligrini;S. Datta;A. Flatau
磁致伸缩材料的区别在于其机械和磁过程之间的固有耦合，其表现为直接（致动器）和逆（传感器）效应。用于模拟这些属性的压磁方程可以从热力学势导出，通常假设绝热条件（可忽略的热交换）和等温条件。项d和d* 通常用于表示致动器和传感器耦合系数，其分别将应变与场以及应力与磁感应强度相关联，对于任何给定的操作点，这两个项的等效性被施加以满足能量守恒。在本文中，我们提出的实验结果表明，在这些条款的差异已被观察到的操作制度也表现出非典型的趋势，在他们的闭环能量转导周期。本文介绍了Galfenol样品进行闭环循环加载的实验研究的结果，作为磁场和压缩应力的函数的磁致伸缩和磁化测量。根据测量结果计算样品所做的功，并讨论样品所做的功的异常趋势。
Magnetostrictive materials are distinguished by an inherent coupling between their mechanical and magnetic processes which is manifested as a direct (actuator) and an inverse (sensor) effect. The piezomagnetic equations for modeling these attributes can be derived from the thermodynamic potentials, with the usual assumptions regarding adiabatic conditions (negligible heat exchange) and isothermal conditions. The terms d and d* are often used to represent the actuator and sensor coupling coefficients that relate strain to field, and stress to magnetic induction respectively, with equivalence of these two terms for any given operating point imposed to satisfy energy conservation. In this paper, we present experimental results which suggest that the operating regimes in which differences in these terms have been observed also exhibit atypical trends in their closed-loop energy transduction cycles. The paper presents results from experimental studies in which closed-loop cyclic loading of Galfenol samples was conducted, with measurement of magnetostriction and magnetization as a function of magnetic field and compressive stress. The work done on/by the sample is calculated based on the measurements and the anomalous trends on work done on/by the samples will be discussed.