作者:标准资料网 时间:2024-05-16 08:39:23   浏览:8971   来源:标准资料网

【英文标准名称】:StandardPracticeforUltrasonicSurfaceTestingUsingElectromagneticAcousticTransducer(EMAT)Techniques
【原文标准名称】:用电磁声换能器(EMAT)技术的超声波测试用标准实用规程
【标准号】:ASTME1962-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:E07.06
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:electromagneticacoustictransducer;EMAT;flawdetection;NDTofwelds;nondestructivetesting;Rayleigh;surfacewaves;ultrasonicinspection;EMAT(electromagneticacoustictransducer);Flawdetection;Nondestructiveevaluation(NDE);Rayleighw
【摘要】:EMATtechniquesshowbenefitsandadvantagesoverconventionalpiezoelectricultrasonictechniquesinspecialapplicationswhereflexibilityinthetypeofwavemodegenerationisdesired.EMATsarehighlyefficientinthegenerationofsurfacewaves.SinceEMATsarehighlyefficientinthegenerationofsurfacewaves,andsinceacoustictechniquesutilizingsurfacewavesareproveneffectivefordetectingsurfaceandnear-surfacediscontinuities,theyshouldbeconsideredforanyapplicationswhereconventionalpenetranttestingandmagneticparticleNDTtechniquesareeffectivebutundesirable.SinceEMATtechniquesarenon-contacting,theyshouldbeconsideredforultrasonictestingwhereapplicationsinvolveautomation,high-speedinspections,movingobjects,applicationsinremoteorhazardouslocations,applicationstoobjectsatelevatedtemperatures,orobjectswithroughsurfaces.ThepurposeofthispracticeistopromotetheEMATtechniqueoftheultrasonicmethodasaviablealternativetoconventionalPTandMPTmethodsfordetectingthepresenceofsurfaceandnear-surfacematerialdiscontinuities.TheuseofEMATsandtheselectionofappropriateoperatingparameterspresupposeaknowledgeofthegeometryofthecomponent;theprobablelocation,size,orientation,andreflectivityoftheexpectedflaws;theallowablerangeofEMATlift-off;andthelawsofphysicsgoverningthepropagationofultrasonicwaves.ThisprocedurepertainstoaspecificEMATsurfaceinspectionapplication.1.1ThispracticecoversguidelinesforutilizingEMATtechniquesfordetectingmaterialdiscontinuitiesthatareprimarilyopentothesurface(forexample,cracks,seams,laps,coldshuts,laminations,throughleaks,lackoffusion).Thistechniquecanalsobesensitivetoflawsanddiscontinuitiesthatarenotsurface-breaking,providedtheirproximitytothesurfaceislessthanorequaltotheRayleighwavelength.1.2Thispracticecoversproceduresforthenon-contactcouplingofsurfacewavesintoamaterialviaelectromagneticfields.1.3Theproceduresofthispracticeareapplicabletoanymaterialinwhichacousticwavescanbeintroducedelectromagnetically.Thisincludesanymaterialthatiseitherelectricallyconductiveorferromagnetic,orboth.1.4Thispracticeisintendedtoprovideexaminationcapabilitiesforin-process,final,andmaintenanceapplications.1.5Thispracticedoesnotprovidestandardsfortheevaluationofderivedindications.Interpretation,classification,andultimateevaluationofindications,albeitnecessary,arebeyondthescopeofthispractice.Separatespecificationsoragreementwillbenecessarytodefinethetype,size,location,anddirectionofindicationsconsideredacceptableornon-acceptable.1.6Thevaluesstatedininch-poundunitsaretoberegardedasthestandards.TheSIunitsgiveninparenthesesareforinformationonly.1.7Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H26
【国际标准分类号】:19_100
【页数】:8P.;A4
【正文语种】:英语