磁致伸缩复合材料性能的影响因素分析  

Analyzing performance and its influence factors of magnetostrictive composites using theory of demagnetization and meso-mechanics

作　　者：关新春[1] 董旭峰[1] 欧进萍[1] 

机构地区：[1]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090

出　　处：《功能材料》2008年第9期1430-1435,1439,共7页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50478024);国家重点基础研究发展计划(973计划)资助项目(2007CB714204)

摘　　要：首先由退磁场效应分析得到有效磁场强度与外磁场强度的关系,继而根据复合材料细观力学中的Eshelby等效夹杂理论和Mori-Tanaka方法导出了颗粒磁场伸缩应变与复合材料磁致伸缩应变的关系,结合Terfenol-D颗粒磁致应变及弹性模量与有效磁场强度的关系,最终预测了环氧基Terfenol-D复合材料磁致应变及有效弹性模量与外磁场强度的关系,并分析了颗粒含量、形状及基体弹模对复合材料饱和磁致伸缩系数及弹性模量的影响。结果表明,磁致伸缩复合材料的饱和磁致伸缩应变随颗粒含量、纵横比增大而增大,随基体弹模增大而减小;有效弹性模量随颗粒含量、颗粒纵横比、基体弹模的增大而增大;颗粒的纵横比越大、含量越大,复合材料的饱和磁场强度越小,磁致伸缩应变随磁场强度的变化越快;复合材料的有效弹性模量亦随磁场强度的增大而增大,其影响程度在颗粒体积含量和颗粒纵横比较大时尤为显著。Considering demagnetization effects, the relationship between effective magnetic field of particles and applied field is firstly obtained. Then treating the magnetostriction of particulate as an eigenstrain and taking the relationships between magnetostriction and elasticity modulus of Terfenol-D particulate and effective field into consideration, the average magnetostriction and effective elasticity modulus of epoxy-bonded Terfenol-D composites under any applied field as well as saturation magnetic field are calculated based on Eshelby equivalent inclusion and Mori-Tanaka method. The results indicate that saturation magnetostrlction of magnetostrictive composites increases with increasing of particle aspect ratio, particle volume fraction and decreasing of elasticity modulus of matrix. Effective elasticity modulus increases with increasing of particle volume fraction, particle as- pect ratio and elasticity modulus of matrix. Besides, the saturation magnetic field decreases with increasing particle aspect ratio and volume fraction. Elasticity modulus of magnetostrictive composites increases with increasing applied field. The influence of applied field on magnetostriction and elasticity modulus of the composites is more significant when particle volume fraction or particle aspect ratio is larger.

关 键 词：磁致伸缩复合材料 磁致伸缩应变 退磁因子 ESHELBY等效夹杂理论 MORI-TANAKA方法 TERFENOL-D 

分 类 号：TB381[一般工业技术—材料科学与工程]