BS ISO/IEC 19757-9-2009 信息技术.文件模式定义语言(DSDL).文件类型定义(DTDs)中的名字空间和数据类型说明
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【英文标准名称】:Informationtechnology-Documentschemadefinitionlanguages(DSDL)-Namespaceanddatatypedeclarationindocumenttypedefinitions(DTDs)
【原文标准名称】:信息技术.文件模式定义语言(DSDL).文件类型定义(DTDs)中的名字空间和数据类型说明
【标准号】:BSISO/IEC19757-9-2009
【标准状态】:现行
【国别】:英国
【发布日期】:2009-09-30
【实施或试行日期】:2009-09-30
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:数据模型;数据处理;数据类型;定义(术语);文献描述;可扩展标记语言;信息技术;程序设计语言;计划;语义学;句法;用词;可扩展标示语言(XML)
【英文主题词】:Datamodels;Dataprocessing;Datatypes;Definitions;Documentdescription;ExtensibleMarkupLanguage;Informationtechnology;Programminglanguages;Schemes;Semantics;Syntax;Wording;XML
【摘要】:
【中国标准分类号】:L74
【国际标准分类号】:35_240_30
【页数】:24P;A4
【正文语种】:英语
【英文标准名称】:StandardTestMethodforScratchHardnessofMaterialsUsingaDiamondStylus
【原文标准名称】:用金刚石触针测定材料划痕硬度的标准试验方法
【标准号】:ASTMG171-2003(2009)e2
【标准状态】:现行
【国别】:美国
【发布日期】:2003
【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】:G02.30
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:scratch;scratchhardness;single-pointabrasion;stylus;Ceramicmaterials/applications;Coatingadhesion;Deformation--metals/alloys;Deformationresistance;Diamondstylus;Laboratorytesting;Lubricatedmaterials/testing;Metalsandmetallicmaterials
【摘要】:Thistestmethodisintendedtomeasuretheresistanceofsolidsurfacestopermanentdeformationundertheactionofasinglepoint(stylustip).Itisacompanionmethodtoquasi-statichardnesstestsinwhichastylusispressedintoasurfaceunderacertainnormalloadandtheresultantdepthorimpressionsizeisusedtocomputeahardnessnumber.Scratchhardnessnumbers,unlikequasi-statichardnessnumbers,involveadifferentcombinationofpropertiesofthesurfacebecausetheindenter,inthiscaseadiamondstylus,movestangentiallyalongthesurface.Therefore,thestressstateunderthescratchingstylusdiffersfromthatproducedunderaquasi-staticindenter.Scratchhardnessnumbersareinprincipleamoreappropriatemeasureofthedamageresistanceofamaterialtosurfacedamageprocessesliketwo-bodyabrasionthanarequasi-statichardnessnumbers.Thistestmethodisapplicabletoawiderangeofmaterials.Theseincludemetals,alloys,andsomepolymers.Themaincriteriaarethatthescratchingprocessproducesameasurablescratchinthesurfacebeingtestedwithoutcausingcatastrophicfracture,spallation,orextensivedelaminationofsurfacematerial.Severedamagetothetestsurface,suchthatthescratchwidthisnotclearlyidentifiableorthattheedgesofthescratcharechippedordistorted,invalidatestheuseofthistestmethodtodetermineascratchhardnessnumber.Sincethedegreeandtypeofsurfacedamageinamaterialmayvarywithappliedload,theapplicabilityofthistesttocertainclassesofmaterialsmaybelimitedbythemaximumloadatwhichvalidscratchwidthmeasurementscanbemade.Theresistanceofamaterialtoabrasionbyasinglepointmaybeaffectedbyitssensitivitytothestrainrateofthedeformationprocess.Therefore,thistestisconductedunderlowstylustraversingspeeds.Useofaslowscratchingspeedalsominimizesthepossibleeffectsoffrictionalheating.Thistestusesmeasurementsoftheresidualscratchwidthafterthestylushasbeenremovedtocomputethescratchhardnessnumber.Therefore,itreflectsthepermanentdeformationresultingfromscratchingandnottheinstantaneousstateofcombinedelasticandplasticdeformationofthesurface.1.1Thistestmethodcoverslaboratoryproceduresfordeterminingthescratchhardnessofthesurfacesofsolidmaterials.Withincertainlimitations,asdescribedinthisguide,thistestmethodisapplicabletometals,ceramics,polymers,andcoatedsurfaces.Thescratchhardnesstest,asdescribedherein,isnotintendedtobeusedasameanstodeterminecoatingadhesion,norisitintendedforusewithotherthanspecifichemispherically-tipped,conicalstyli.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandardmayinvolvehazardousmaterials,operations,andequipment.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H23
【国际标准分类号】:17_040_20
【页数】:7P.;A4
【正文语种】:英语