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ASTM C1678-2010 陶瓷和玻璃中的断裂镜面尺寸的断裂面显微镜图像分析的标准实施规程

作者:标准资料网 时间:2024-04-15 05:51:42  浏览:9630   来源:标准资料网
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【英文标准名称】:StandardPracticeforFractographicAnalysisofFractureMirrorSizesinCeramicsandGlasses
【原文标准名称】:陶瓷和玻璃中的断裂镜面尺寸的断裂面显微镜图像分析的标准实施规程
【标准号】:ASTMC1678-2010
【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】:C28.03
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:ceramics;fractography;fracturemirror;fracturestrength;fracturestress;fracturesurface;glasses;hackle;microscope;mist;origin;residualstresses;Ceramicware;Fracturemirrors;Fracturetesting--glass;Glassware
【摘要】:Fracturemirrorsizeanalysisisapowerfultoolforanalyzingglassandceramicfractures.FracturemirrorsaretelltalefractographicmarkingsinbrittlematerialsthatsurroundafractureoriginasdiscussedinPracticesC1256andC1322.Fig.1showsaschematicwithkeyfeaturesidentified.Fig.2showsanexampleinglass.Thefracturemirrorregionisverysmoothandhighlyreflectiveinglasses,hencethenamex201C;fracturemirror.x201D;Infact,highmagnificationmicroscopyrevealsthat,evenwithinthemirrorregioninglasses,thereareveryfinefeaturesandescalatingroughnessasthecrackadvancesawayfromtheorigin.Thesearesubmicrometerinsizeandhencearenotdiscernablewithanopticalmicroscope.Earlyinvestigatorsinterpretedfracturemirrorsashavingdiscreteboundariesincludingax201C;mirror-mistx201D;boundaryandalsoax201C;mist-hacklex201D;boundaryinglasses.Thesewerealsotermedx201C;innermirrorx201D;orx201C;outermirrorx201D;boundaries,respectively.Itisnowknownthattherearenodiscreteboundariescorrespondingtospecificchangesinthefractographicfeatures.Surfaceroughnessincreasesgraduallyfromwellwithinthefracturemirrortobeyondtheapparentboundaries.Theboundarieswereamatterofinterpretation,theresolvingpowerofthemicroscope,andthemodeofviewing.Inveryweakspecimens,themirrormaybelargerthanthespecimenorcomponentandtheboundarieswillnotbepresent.Figs.3-5showexamplesinceramics.Inpolycrystallineceramics,thequalifierx201C;relativelyx201D;asinx201C;relativelysmoothx201D;mustbeused,sincethereisaninherentroughnessfromthemicrostructureevenintheareaimmediatelysurroundingtheorigin.Incoarse-grainedorporousceramics,itmaybeimpossibletoidentifyamirrorboundary.Inpolycrystallineceramics,itishighlyunlikelythatamirror-mistboundarycanbedetectedduetotheinherentroughnesscreatedbythecrack-microstructureinteractions,evenwithinthemirror.Thewordx201C;systematicx201D;inthedefinitionforx201C;mirror-hackleboundaryinpolycrystallineceramicsx201D;requiressomeelaboration.Mirrorboundaryhacklelinesarevelocityhacklelinescreatedaftertheradiatingcrackreachesterminalvelocity.However,premature,isolatedhacklecaninsomeinstancesbegeneratedwellwithinaceramicfracturemirror.Itshouldbedisregardedwhenjudgingthemirrorboundary.Wakehacklefromanisolatedobstacleinsidethemirror(suchasalargegrainoragglomerate)cantriggerearlyx201C;prematurex201D;hacklelines.Stepsinscratchesorgrindingflawscantriggerhacklelinesthatemanatefromtheoriginitself.Sometimesthemicrostructureofpolycrystallineceramicscreatesseverejudgmentproblemsinceramicmatrixcomposites(particulate,whisker,orplatelet)orself-reinforcedceramicswherebyelongatedandinterlockinggrainsimpartgreaterfractureresistance.Mirrorsmaybeplainlyevidentatlowmagnifications,butaccurateassessmentoftheirsizecanbedifficult.Th......
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【英文标准名称】:StandardTestMethodforLowLevelDeterminationofTotalCarbon,InorganicCarbonandOrganicCarboninWaterbyUltraviolet,PersulfateOxidation,andMembraneConductivityDetection
【原文标准名称】:通过紫外线,过硫酸盐氧化,和膜导检测对水中总碳,有机碳,无机碳低水平测定的标准试验方法
【标准号】:ASTMD6317-1998
【标准状态】:现行
【国别】:美国
【发布日期】:1998
【实施或试行日期】:
【发布单位】:美国材料与试验协会(ASTM)
【起草单位】:ASTM
【标准类型】:()
【标准水平】:()
【中文主题词】:有机碳;碳;高纯度水;无机碳;低温氧化;膜导探测;总碳;二氧化碳
【英文主题词】:organiccarbon;high-puritywater;inorganiccarbon;lowtemperatureoxidation;carbondioxide;membraneconductivitydetection;carbon;totalcarbon
【摘要】:
【中国标准分类号】:Z16
【国际标准分类号】:
【页数】:
【正文语种】:英语


【英文标准名称】:PerformanceRatingofCommercialandIndustrialHumidifiers(formerlyANSI/AHRI640-2005)
【原文标准名称】:商业和工业加湿器的性能等级
【标准号】:ANSI/AHRI640-2005
【标准状态】:现行
【国别】:美国
【发布日期】:2005
【实施或试行日期】:
【发布单位】:美国国家标准学会(US-ANSI)
【起草单位】:ANSI
【标准类型】:()
【标准水平】:()
【中文主题词】:空调;加湿器;规范(验收)
【英文主题词】:Airconditioning;Humidifiers;Specification(approval)
【摘要】:ThisstandardappliestofactorymadeCommercialandIndustrialHumidifiers.
【中国标准分类号】:P48
【国际标准分类号】:91_140_30
【页数】:
【正文语种】:英语



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