巨磁致伸缩薄膜-衬底悬臂梁系统的力学特性  

Mechanical Characteristics of a Giant Magnetostrictive Film-Substrate Cantilever System

作　　者：云国宏[1] 那日苏[1] 

机构地区：[1]内蒙古大学理工学院

出　　处：《纳米技术与精密工程》2008年第1期29-33,共5页Nanotechnology and Precision Engineering

基　　金：国家自然科学基金资助项目(10762001);教育部新世纪优秀人才计划项目(NCET-05-0272);教育部科学技术研究重大项目(206024)

摘　　要：利用四参量能量极小化方法求解了任意薄膜/衬底厚度比悬臂梁系统的弯曲问题.在此基础上重点分析了磁膜应力和应变与构成悬臂梁的两种材料的几何参数和物理参数的关系,给出了这些参数对磁膜-衬底悬臂梁系统中平面弯曲特性的影响.计算结果表明,中平面在一般情况下是各向异性的,且随着磁膜厚度的增加中平面迅速下降;磁膜应力随着膜厚增加而减小,应变随膜厚增加而增加;材料泊松比对垂直于磁化方向的应力和应变以及中平面的影响很大,但是,泊松比对磁化方向的应力、应变和中平面的影响很小,可以忽略不计.The bending problem of a cantilever system with arbitrary thickness ratio of film to substrate was resolved by using a four-parameter energy minimization method. Based on this solution, the relationship between stress and strain of film and the material parameters of two cantilever components was analyzed, and the influence of such material parameters on the bending characteristics of the magnetic film-substrate cantilever system was presented. The calculation results indicate that the neutral plane is generally anisotropic, and moves downwards rapidly with the increase of thickness ratio. The stress of magnetic film decreases with the increase of thickness ratio, while the strain of film increases. The effect of Poisson＇s ratio of the material on the strain, stress of the film and neutral plane is prominent in the direction vertical to the magnetization. However, the effect of Poisson＇s ratio on the strain, stress of the film and neutral plane can be neglected in the magnetization direction.

关 键 词：巨磁致伸缩材料 磁膜-衬底悬臂梁 应力与应变分析 力学 

分 类 号：TM271[一般工业技术—材料科学与工程]