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页数:6页
时间:2017-12-08
《求解压电材料pkhs裂纹的另一种方法》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、http://www.paper.edu.cnAnAlternativeMethodforaPKHSCrackinPiezoelectric1MaterialsZhuochengOuYihengChen*DepartmentofEngineeringMechanics,DepartmentofEngineeringMechanics,Xi’anJiaotongUniversityXi’anJiaotongUniversityXi’anCity,710049,P.R.ChinaXi’anCity,710049,P.R.Chi
2、nazcou@mail.xjtu.edu.cnyhchen2@mail.xjtu.edu.cnAbstractThispaperpresentsaalternativemethodforaPKHScrackgapinpiezoelectricmaterials.ThePKHScrackwasproposedbyPartonandKudryavtsev[1]andHaoandShen[2],whichaccountsfortheinfluenceinducedbythepermittivityofmediuminsidecr
3、ackgapuponcracktipparameters.BasedonStroh’stheory,analternativetechniqueisproposedinacompactformwithoutanytreatmentofthemappingtechnique.Keywords:crack;piezoelectric;permittivity.1.IntroductionOverthepastseveraldecades,piezoelectricmaterialshavebeenwidelyusedinele
4、ctromechanicalandelectronicdevicessuchaselectromechanicalactuators,sensorsandtransducers,duetotheirexcellentpiezoelectricandconversepiezoelectriceffects.CommonlyusedpiezoelectricceramicssuchasPZTceramicsareverybrittleandhencesusceptibletofractureduringservicesotha
5、titisveryimportanttounderstandthefracturingbehaviorofpiezoelectricmaterialstoensurereliabilityofsmartstructures.However,thefracturebehaviorofapiezoelectricceramicundercombinedmechanicalandelectricalloadingsismuchmorecomplicatedthanthatfortraditionalbrittleceramics
6、wheretheuseoflinearelasticfracturemechanicssuffices.AsignificantadvanceistheinvestigationsbyPartonandKudryavtsev[1]andHaoandShen[2]whoproposedthePKHScrackmodelaccountingforthepermittivityofmediuminsidecrackgap.Morerecently,Gruebneret.al.[3]developedafiniteelementa
7、nalysisofcracksinpiezoelectricmaterialstakingintoaccountdifferentvaluesofpermittivityinsidethecrackgap.Theyshowedthattheelectricalpermeabilityofthecrackhasasignificantinfluenceontheelectromechanicalfieldsespeciallynearthecracktipandinturnonthefracturemechanicspara
8、meters.Thismeansthatthenear-tipmechanicalandelectricfieldofthelimitedpermeablecrackswithairbeingcrackmedium(i.e.,thePKHScrack)cannotbeapproximatedbythen
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