A nonlinear constitutive model of magneto-thermo-mechanical coupling for giant magnetostrictive materials

A nonlinear constitutive model of magneto-thermo-mechanical coupling for giant magnetostrictive materials
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超磁致伸缩材料磁热力耦合非线性本构模型

DOI:
10.1063/1.2338834
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发表时间:
2006-09
影响因子:
3.2
通讯作者:
Sun, Le
Sun, Le
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Zheng, Xiao Jing;Sun, Le

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超磁致伸缩材料典型的磁致伸缩应变场曲线是非线性的,并且受预应力和温度的影响显着。本文提出了描述这些特性的本构模型。这里考虑的模型建立在吉布斯自由能函数 G(σij,Mk,T) 的基础上。热力学关系用于获得本构表达式。基于模型的结果表明,不同预应力和温度下的磁致伸缩应变、磁化强度和杨氏模量的非线性特性与实验数据非常吻合。此外,由于该模型所涉及的参数都可以通过实验轻松确定,因此该模型易于在工程应用中使用。
The magnetostrictive strain-applied field curve typical of giant magnetostrictive materials is nonlinear and it is affected notably by prestress and temperature. A constitutive model to describe these properties is suggested in this paper. The model considered here is built on the Gibbs free energy function G(σij,Mk,T). Thermodynamic relations are used to obtain the constitutive expressions. Results based on the model show that the nonlinear property of magnetostrictive strain, the magnetization, and Young’s modulus under different prestress and temperature are in excellent agreement with experimental data. Moreover, the proposed model is convenient to be used in engineering applications since the parameters referred to the model can all be easily determined by experiments.
DOI: 10.1016/s0924-4247(03)00146-8
发表时间: 2003-09
影响因子: 4.6
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