【英文标准名称】:StandardPracticefortheMeasurementoftheApparentAttenuationofLongitudinalUltrasonicWavesbyImmersionMethod
【原文标准名称】:浸渍法测量纵向超声波的表面衰减的标准实施规程
【标准号】:ASTME664/E664M-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【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】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:apparentattenuation;attenuation;immersionmethod;nondestructiveexamination;ultrasonicexamination;Apparentattenuation;Attenuation;Immersion--ultrasonic;Nondestructiveevaluation(NDE);Ultrasonictesting
【摘要】:Themeasurementofapparentattenuationinmaterialsisusefulinapplicationssuchasthecomparisonofheattreatmentsofdifferentlotsofmaterialortheassessmentofthedegradationofmaterialsduetoenvironment.Severaldifferentmodesofwavevibrationcanbepropagatedinsolids.Thispracticeisconcernedwiththeattenuationassociatedwithlongitudinalwavesintroducedintothespecimenbytheimmersionmethod.Thispracticeallowsforthecomparisonoftheapparentattenuationsofgeometricallysimilarspecimens.Forthedeterminationofapparentattenuation,theproceduresdescribedhereinarevalidonlyformeasurementsinthefarfieldoftheultrasonicbeam.1.1Thispracticedescribesaprocedureformeasuringtheapparentattenuationofultrasoundinmaterialsorcomponentswithflat,parallelsurfacesusingconventionalpulse-echoultrasonicflawdetectionequipmentinwhichreflectedindicationsaredisplayedinanA-scanpresentation.1.2Themeasurementprocedureisreadilyadaptableforthedeterminationofrelativeattenuationbetweenmaterials.Forabsolute(true)attenuationmeasurements,indicativeoftheintrinsicnatureofthematerial,itisnecessarytocorrectforspecimengeometry,soundbeamdivergence,instrumentation,andproceduraleffects.Theseresultscanbeobtainedwithmorespecializedultrasonicequipmentandtechniques.1.3ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Z32
【国际标准分类号】:17_140_01
【页数】:3P.;A4
【正文语种】:英语

标准名称：	工业用裂解碳四中微量水的测定 卡尔·费休法
英文名称：	Cracking C4 fraction for industrial use--Determination of trace water--Karl Fischer method
中标分类：	化工 >> 有机化工原料 >> 一般有机化工原料
替代情况：	原标准号GB 6605-86
发布日期：
实施日期：	1992-05-20
首发日期：
作废日期：
出版日期：
页数：	11页

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