作者:标准资料网 时间:2024-05-20 18:36:28   浏览:9206   来源:标准资料网

【英文标准名称】:StandardTestMethodforLaboratoryDeterminationofPulseVelocitiesandUltrasonicElasticConstantsofRock
【原文标准名称】:实验室测定岩石的脉冲速度和超声波弹性常数的标准试验方法
【标准号】:ASTMD2845-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:D18.12
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:compressiontesting;anisotropy;ultrasonictesting;velocity-pulse;Anisotropy;Elasticconstants;Isotropicrockspecimens;Pulsevelocity;Rockmaterials/properties/analysis;Sheartesting--rock;Ultrasonictesting--environmentalmaterials/applicatio
【摘要】:Theprimaryadvantagesofultrasonictestingarethatityieldscompressionandshearwavevelocities,andultrasonicvaluesfortheelasticconstantsofintacthomogeneousisotropicrockspecimens(3).Elasticconstantsarenottobecalculatedforrockshavingpronouncedanisotropybyproceduresdescribedinthistestmethod.Thevaluesofelasticconstantsoftendonotagreewiththosedeterminedbystaticlaboratorymethodsortheinsitumethods.Measuredwavevelocitieslikewisemaynotagreewithseismicvelocities,butoffergoodapproximations.Theultrasonicevaluationofrockpropertiesisusefulforpreliminarypredictionofstaticproperties.Thetestmethodisusefulforevaluatingtheeffectsofuniaxialstressandwatersaturationonpulsevelocity.Thesepropertiesareinturnusefulinengineeringdesign.Thetestmethodasdescribedhereinisnotadequateformeasurementofstress-waveattenuation.Also,whilepulsevelocitiescanbeemployedtodeterminetheelasticconstantsofmaterialshavingahighdegreeofanisotropy,theseproceduresarenottreatedherein.Note28212;Thequalityoftheresultproducedbythisstandardisdependentonthecompetenceofthepersonnelperformingit,andthesuitabilityoftheequipmentandfacilitiesused.AgenciesthatmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetentandobjectivetestingandsampling.UsersofthisstandardarecautionedthatcompliancewithPracticeD3740doesnotinitselfassurereliableresults.Reliableresultsdependonmanyfactors;PracticeD3740providesameansofevaluatingsomeofthosefactors.1.1Thistestmethoddescribesequipmentandproceduresforlaboratorymeasurementsofthepulsevelocitiesofcompressionwavesandshearwavesinrock(1)andthedeterminationofultrasonicelasticconstants(Note1)ofanisotropicrockoroneexhibitingslightanisotropy.Note18212;Theelasticconstantsdeterminedbythistestmethodaretermedultrasonicsincethepulsefrequenciesusedareabovetheaudiblerange.Thetermssonicanddynamicaresometimesappliedtotheseconstantsbutdonotdescribethemprecisely(2).Itispossiblethattheultrasonicelasticconstantsmaydifferfromthosedeterminedbyotherdynamicmethods.1.2Thistestmethodisvalidforwavevelocitymeasurementsinbothanisotropicandisotropicrocksalthoughthevelocitiesobtainedingrosslyanisotropicrocksmaybeinfluencedbysuchfactorsasdirection,traveldistance,anddiameteroftransducers.1.3Theultrasonicelasticconstantsarecalculatedfromthemeasuredwavevelocitiesandthebulkdensity.Thelimitingdegreeofanisotropyforwhichcalculationsofelasticconstantsareallowedandproceduresfordeterminingthedegreeofanisotropyarespecified.1.4Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:P13
【国际标准分类号】:93_020
【页数】:7P.;A4
【正文语种】:英语