ASTM D6068-2010 塑料材料J-R曲线测定的标准试验方法

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【英文标准名称】:StandardTestMethodforDeterminingJ-RCurvesofPlasticMaterials
【原文标准名称】:塑料材料J-R曲线测定的标准试验方法
【标准号】:ASTMD6068-2010
【标准状态】:现行
【国别】:
【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】:D20.10
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:裂纹扩展阻力;断裂韧性;塑料;高聚物;破裂-裂纹扩展;断口测试-塑料;J-R曲线;荷载试验-塑料;塑料材料;
【英文主题词】:crackgrowthresistance;fracturetoughness;J-Rcurves;plastics;polymers;Cracking--crackgrowth;Fracturetesting--plastics;J-Rcurves;Loadingtests--plastics;Plasticmaterials;Polymers
【摘要】:AJ-Rcurveproducedinaccordancewiththistestmethodcharacterizesthecrackgrowthresistancesofawiderangeoftoughpolymersandpolymerblends(1-5)thatcannotbeobtainedinsufficientsizeandthicknessforvalidcharacterizationbylinearelasticfracturemechanicsinTestMethodsD5045.TheJ-Rcurvecharacterizes,withinthelimitssetforthinthistestmethod,theresistanceofapolymericmaterialtoslowstablecrackgrowthafterinitiationfromapreexistingsharpflaw.AJ-Rcurvecanbeusedasanindexofmaterialtoughnessforblendoralloydesign,materialselection,materialsprocessing,andqualityassurance(6).TheJ-RcurvesfrombendspecimensrepresentlowerboundestimatesofJcapacityasafunctionofcrackextension,andhavebeenobservedtobeconservativerelativetothoseobtainedfromspecimenconfigurationsundertensileloading.TheJ-Rcurvesforagivenmaterialofconstantmicrostructuretendtoexhibitlowerslope(flatter)withincreasingthickness.Thus,itisrecommendedthatthelargestpossiblespecimenwithrepresentativemicrostructurebeused.TheJ-Rcurvecanbeusedtoassessthestabilityofcracksinstructuresinthepresenceofductiletearing,withawarenessofthedifferencesthatmayexistbetweenlaboratorytestandfieldconditions.AJ-Rcurvemaydependontheorientationandpropagationofthecrackinrelationtotheanisotropyofthematerialwhichmaybeinducedbyspecimenfabricationmethods.Becauseofthepossibilityofratedependenceofcrackgrowthresistance,J-Rcurvescanbedeterminedatdisplacementratesotherthanthatspecifiedinthistestmethod(7).1.1ThistestmethodcoversthedeterminationoftheJ-integralversuscrackgrowthresistance(J-R)curvesforpolymericmaterials.1.2Thistestmethodisintendedtocharacterizetheslow,stablecrackgrowthresistanceofbend-typespecimensinsuchamannerthatitisgeometryinsensitivewithinlimitssetforthinthistestmethod.1.3Therecommendedspecimensarethethree-pointbend(SE(B))andpin-loadedcompacttension(C(T))specimens.Bothspecimenshavein-planedimensionsofconstantproportionalityforallsizes.Specimenconfigurationsotherthanthoserecommendedinthistestmethodmayrequiredifferentproceduresandvalidityrequirements.1.4Thistestmethoddescribesamultiplespecimenmethodthatrequiresopticalmeasurementofcrackextensionfromfracturesurfaces.Itisnotrecommendedforusewithmaterialsinwhichthecrackfrontcannotbedistinguishedfromadditionaldeformationprocessesinadvanceofthecracktip.1.5ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Note18212;ThereisnoequivalentISOstandard.
【中国标准分类号】:G31
【国际标准分类号】:83_040_01
【页数】:8P.;A4
【正文语种】:


【英文标准名称】:Informationtechnology;telecommunicationsandinformationexchangebetweensystems;protocolcombinationstoprovideandsupporttheOSInetworkservice;part2:provisionandsupportoftheconnection-modenetworkservice
【原文标准名称】:信息技术.系统间的电信和信息交换.提供支持开放系统互连网络服务的协议组合.第2部分:连接模式网络服务的支持和保证
【标准号】:ISO/IEC8880-2-1992
【标准状态】:作废
【国别】:国际
【发布日期】:1992-12
【实施或试行日期】:
【发布单位】:国际标准化组织(ISO)
【起草单位】:ISO/IEC/JTC1
【标准类型】:()
【标准水平】:()
【中文主题词】:控制规程;开放系统互连;信息交流;信息处理;数据处理;网络互连;信息交换;通信规程
【英文主题词】:
【摘要】:
【中国标准分类号】:L79
【国际标准分类号】:35_100_30
【页数】:7P;A4
【正文语种】:英语


【英文标准名称】:Prevailingtorquetype(all-metalhexagonnuts),style2-Propertyclasses5,8,10and12(ISO7042:1997);GermanversionENISO7042:1997
【原文标准名称】:2型经常作用的扭矩型六角螺母(用全金属螺母).性能等级5,8,10和12
【标准号】:ENISO7042-1997
【标准状态】:现行
【国别】:
【发布日期】:1998-02
【实施或试行日期】:
【发布单位】:欧洲标准学会(EN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:尺寸;螺纹;金属;名称与符号;交货条件;作标记;规范(验收);紧固件;公差(测量);防松螺母;机械性能;特性;材料;螺母;六角螺母;长效扭矩式;强度等级;验收规范;六角头紧固件
【英文主题词】:Acceptancespecification;Deliveryconditions;Designations;Dimensions;Fasteners;Hexagonnuts;Hexagonal-headfasteners;Locknuts;Marking;Materials;Mechanicalproperties;Metals;Nuts;Prevailingtorquetype;Properties;Self-locking;Specification(approval);Specifications;Strengthclass;Strengthofmaterials;Threads;Tolerances(measurement)
【摘要】:
【中国标准分类号】:J13
【国际标准分类号】:21_060_20
【页数】:7P.;A4
【正文语种】:英语