Magnetomechanical characterization and unified energy model for the quasistatic behavior of ferromagnetic shape memory Ni–Mn–Ga
Magnetomechanical characterization and unified energy model for the quasistatic behavior of ferromagnetic shape memory Ni–Mn–Ga
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DOI：
10.1088/0964-1726/19/3/035001
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发表时间：
2010-01
影响因子：
4.1
通讯作者：
N. Sarawate;M. Dapino
中科院分区：
文献类型：
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作者：
N. Sarawate;M. Dapino
本文综述了单晶铁磁形状记忆合金Ni-Mn-Ga的表征和模型。提出了一个连续热力学模型，该模型描述了单晶Ni-Mn-Ga的以下行为的磁机械特性：（i）传感效应;（ii）致动效应;（iii）阻挡力（应力产生）。热力学势，即磁吉布斯能和吉布斯能，是从亥姆霍兹能量中获得的，以达到所需的自变量和因变量的集合;势包括由塞曼，静磁和各向异性分量组成的磁能，以及由弹性和孪生分量组成的机械能。机械耗散和Ni-Mn-Ga的微观结构被纳入连续介质模型通过内部状态变量的体积分数，畴分数，和磁化旋转角。材料的本构响应是通过热力学第二定律限制该过程而获得的。该模型只需要从两个简单的实验中确定的七个参数。Ni-Mn-Ga的几个有趣的特性与磁力学表征一致。
This paper presents an overview of the characterization and modeling of single crystal ferromagnetic shape memory Ni–Mn–Ga. A continuum thermodynamics model is presented which describes the magnetomechanical characterization of single crystal Ni–Mn–Ga for the following behavior: (i) sensing effect; (ii) actuation effect; (iii) blocked force (stress generation). The thermodynamic potentials, namely the magnetic Gibbs energy and the Gibbs energy, are obtained from the Helmholtz energy in order to arrive at the set of required independent and dependent variables; the potentials include magnetic energy consisting of Zeeman, magnetostatic and anisotropy components, and mechanical energy consisting of elastic and twinning components. Mechanical dissipation and the microstructure of Ni–Mn–Ga are incorporated in the continuum model through the internal state variables volume fraction, domain fraction, and magnetization rotation angle. The constitutive response of the material is obtained by restricting the process through the second law of thermodynamics. The model requires only seven parameters identified from two simple experiments. Several interesting characteristics of Ni–Mn–Ga are examined in concert with the magnetomechanical characterization.