磁致伸缩层状复合材料性能与器件研究

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1、河北工业大学博士学位论文磁致伸缩层状复合材料性能与器件研究姓名：李淑英申请学位级别：博士专业：电工理论与新技术指导教师：王博文20080401磁致伸缩层状复合材料性能与器件研究5．采用树脂粘结法应用磁致伸缩材料和压电材料制作了磁电层状复合磁场传感器，并对其进行了静态和动态实验研究，发现磁电系数与直流偏置磁场、交流驱动磁场频率、交流驱动磁场大小、磁场方向均有很大关系。研究结果为磁场传感器在磁场测量方面的应用提供了必要的支持。关键词：磁致伸缩层状复合材料，压应力效应，磁场热处理，磁致伸缩复合材料换能器，输出位移，等效电路法，磁电复合磁场传感器，磁电系数II河北工业大学博士

2、学位论文PERFORMANCEANDDEVICESOFMAGNETOSTRICTIVEMULTILAYEREDCOMPOSITESABSTRACTThebigeddycurrentlossinhighfrequencycanbeovercomedformagnetostrictivemultilayeredcompositesbecauseTerfenol-Dlayerswereseparatedbyresinandtheycan’tformalargescrollcurrentloopintheverticaldirectionofthemagneticfield.

3、Meanwhilethebrittlenessofmagnetostrictivematerialcanbereducedbyresin.Thisgreatlyexpandedtheapplicationofgiantmagnetostrictivematerials.Basedonthebroadapplicationprospectsofmagnetostrictivecompositesinhigh-frequencydevices,eveninthefieldofultrasound,themagnetostrictivemultilayeredcomposi

4、tesandtheirsapplicationhasbeenresearched,asfollows.1.ThemagnetostrictionofTerfenol-Dmultilayeredmagnetostrictivecompositeshavebeencalculatedbasedonthemechanicaltheory.AndtheepoxybondedTerfenol-Dmultilayeredmagnetostrictivecompositeshavebeenprepared.Thestaticmagnetostrictionofsamplesandt

5、heprepresseffectoftheirmagnetostrictionhavebeenresearched.Thenthesampleswereannealedinthevacuumat423Kfor15minatthemagneticfieldof240kA/m.Effectsofthecompressivestressandthemagneticfieldheat-treatmentonthemagnetostrictionhavebeeninvestigated.Itisfoundthatthemagnetostrictionofthesamplesca

6、nbeimproved,especiallyunderthecompressivestress.2.ThemagnetostrictionofTerfenol-D/Fe-Gamultilayeredmagnetostrictivecompositeshasbeencalculatedbasedonelongatein-phasemodelandelongatefreenessmodel.ThecalculatingresultcanprovideaguidanceformanufactureofTerfenol-D/Fe-Gamultilayeredcomposite

7、sandtheapplicationofitscorrespondingmagnetostrictivedevices.3.TheoutputdisplacementofthetransducerbasedonTerfenol-Dmultilayeredmagnetostrictivecompositehasbeenresearchedinthefrequencyrangesof0.1Hzto6000Hz.ItisfoundthedynamicdisplacementisaffectedevidentlybythefrequencyofACmagne