層狀壓電—壓磁復合材料中SH波的傳播.pdf

1、Y1044730警級：公開層狀壓電一壓磁復合材料中SH波的傳播PropagationofSHWavesinLayeredPiezoelectric—PiezomagneticMedia(申請石家莊鐵道學院授予工學碩士學位淪文)培養(yǎng)單研究指導教位：工程力學系業(yè)：固體力學生：趙曉芳師：劉金喜教授二oo七年三月AbstractAbstractCompositesorstructuresconsistingofpiezoelectricandp

2、iezomagneticmaterialscanfacilitatetheconversionbetweenmechanical，electricandmagneticenergiesDuetothesecouplingeffects，piezoelectric—piezomagneticcompositesarepotentialcandidatesforuseassensors，magnetoelectriccontrolcompo

3、nents，microwavedevicesaswellasotherelectricproductsThesepossibleapplicationscallfortheoreticalinvestigationintosomefundamentalmechanicsproblemsofpiezoelectric—piezomagneticcompositemediaInthisdissertation，thepropagationo

4、fshearhorizontal(SH)wavesarestudiedinthreetypesofthelayeredmediacomposedofpiezoelectricandpiezomagneticmaterialsThemainworksareasfollowsFirstlythepropagationofLovewavesinlayeredstructuresisinvestigatedfortwocases：apiezom

5、agneticlayeronapiezoelectrichalfspaceandthereverseconfigurationThesurfaceofthelayerismechanicallyfreeandsubjectedtofivekindsofelectromagneticboundaryconditionsThedispersionequationsarepresentedexplicitlyforthesaidboundar

6、yconditionsBasedonthedispersionequations，numericalcalculationsarecarriedouttoshowtheinfluenceoftheboundaryconditionsonthedispersionbehaviorsWefindthatthedispersionbehaviorsdependonthematerialsofthesurfacelayerV們flenthesu

7、rfacelayerispiezomagnetic，themagneticboundaryconditionsdominatethepropagationpropertiesoftheLovewavesSimilarlythepropagationpropertiesoftheLovewavesarecontrolledbytheelectricboundaryconditionswhenthesurfacelayerispiezoel

8、ectricSecondlNtheSHwavepropagationisconsideredinthelayeredspaceconsistingofapiezomagneticlayerandtwopiezoelectrichalfspacesThepropagationvelocityoftheSHwaveareassumedtobelargerthanthevelocityofthebulkshearwaveofthepiezom