取向多晶Fe-Ga合金逆效应的动态特性与本征非线性动态模型研究

项目名称： 取向多晶Fe-Ga合金逆效应的动态特性与本征非线性动态模型研究

项目编号： No.51201055

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 金属材料学科

项目作者： 翁玲

作者单位： 河北工业大学

项目金额： 25万元

中文摘要： Fe-Ga合金是2001年被美国海军武器实验室发现的一种新型超磁致伸缩材料，该材料具有低磁场下高应变、滞后小、应力灵敏度高、机械性能好等优点，在驱动和传感领域均显示出良好的应用前景。目前研究者对Fe-Ga合金的性能测试均集中在准静态条件下致动特性与传感特性的测试上，研究表明，Fe-Ga合金在应力变化时阻抗发生变化，为保持恒定磁场，需要比例积分调节器控制激励电流大小来维持磁场恒定，因此和磁致伸缩特性相比，国内外对其逆磁致伸缩特性的研究较少。关于多晶Fe-Ga合金逆效应的动态特性测试，目前国内外尚未报道。因此本课题提出以取向多晶Fe-Ga合金逆效应动态特性测试为切入点，建立Fe-Ga合金特性本征非线性动态模型，进而建立以Fe-Ga合金为核心的器件系统动力学模型，为新型器件的优化设计和应用打基础。开展取向多晶Fe-Ga合金逆效应的动态特性与本征非线性动态模型研究具有重要理论意义及实际应用价值。

中文关键词： 磁致伸缩；铁镓合金；应力；磁化强度；应变

英文摘要： Magnetostrictive iron-gallium alloy is a new class of structural magnetistrictive material which is developed by researchers at the Naval Surface Warfare Center in 2001. These alloys exhibit moderate magnetostriction under very low magnetic field, have very low hysteresis, high sensitivity to stress, and demonstrate high tensile strength in mechanical properties. All these factors demonstrate that Fe-Ga alloys have great promise as an engineering material for actuation and sensing applications. Quasi-static actuation characterization and sensing behavior have been performed by many researches, the results show that the impendance of Fe-Ga alloys would change when material undergoes changing cyclic stress, and a PI controller has to be applied to excitation coils to keep the magnetic field in Fe-Ga alloys constant throughout the stress cycle. Hence, many researchers took focus on actuation characterization of Fe-Ga alloys other than sensing behavior, especially dynamic sensing behavior. There are no reports on dynamic sensing behavior now. Dynamic nonlinear constitutive model and dynamic characterization of oriented polycrystalline Fe-Ga alloys based on inverse magnetostrictive effect is presented in this project. Firstly, dynamic sensing behavior will be performed based on quasi-static sensing behavior. A nonli

英文关键词： magnetostriction；Fe-Ga alloy；stress；magnetization；strain