【英文标准名称】:StandardTestMethodforTensilePropertiesofPlastics
【原文标准名称】:塑料的拉伸性能的标准试验方法
【标准号】:ASTMD638-2010
【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】:D20.10
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:modulusofelasticity;percentelongation;plastics;tensileproperties;tensilestrength;Engineeringcriteria/design;Reinforcedplastics;Tensileproperties/testing--plastics;Unreinforcedplastics
【摘要】:Thistestmethodisdesignedtoproducetensilepropertydataforthecontrolandspecificationofplasticmaterials.Thesedataarealsousefulforqualitativecharacterizationandforresearchanddevelopment.Formanymaterials,theremaybeaspecificationthatrequirestheuseofthistestmethod,butwithsomeproceduralmodificationsthattakeprecedencewhenadheringtothespecification.Therefore,itisadvisabletorefertothatmaterialspecificationbeforeusingthistestmethod.Table1inClassificationD4000liststheASTMmaterialsstandardsthatcurrentlyexist.Tensilepropertiesmayvarywithspecimenpreparationandwithspeedandenvironmentoftesting.Consequently,whereprecisecomparativeresultsaredesired,thesefactorsmustbecarefullycontrolled.Itisrealizedthatamaterialcannotbetestedwithoutalsotestingthemethodofpreparationofthatmaterial.Hence,whencomparativetestsofmaterialspersearedesired,thegreatestcaremustbeexercisedtoensurethatallsamplesarepreparedinexactlythesameway,unlessthetestistoincludetheeffectsofsamplepreparation.Similarly,forrefereepurposesorcomparisonswithinanygivenseriesofspecimens,caremustbetakentosecurethemaximumdegreeofuniformityindetailsofpreparation,treatment,andhandling.Tensilepropertiesmayprovideusefuldataforplasticsengineeringdesignpurposes.However,becauseofthehighdegreeofsensitivityexhibitedbymanyplasticstorateofstrainingandenvironmentalconditions,dataobtainedbythistestmethodcannotbeconsideredvalidforapplicationsinvolvingload-timescalesorenvironmentswidelydifferentfromthoseofthistestmethod.Incasesofsuchdissimilarity,noreliableestimationofthelimitofusefulnesscanbemadeformostplastics.Thissensitivitytorateofstrainingandenvironmentnecessitatestestingoverabroadload-timescale(includingimpactandcreep)andrangeofenvironmentalconditionsiftensilepropertiesaretosufficeforengineeringdesignpurposes.Note58212;Sincetheexistenceofatrueelasticlimitinplastics(asinmanyotherorganicmaterialsandinmanymetals)isdebatable,theproprietyofapplyingthetermx201C;elasticmodulusx201D;initsquoted,generallyaccepteddefinitiontodescribethex201C;stiffnessx201D;orx201C;rigidityx201D;ofaplastichasbeenseriouslyquestioned.Theexactstress-straincharacteristicsofplasticmaterialsarehighlydependentonsuchfactorsasrateofapplicationofstress,temperature,previoushistoryofspecimen,etc.However,stress-straincurvesforplastics,determinedasdescribedinthistestmethod,almostalwaysshowalinearregionatlowstresses,andastraightlinedrawntangenttothisportionofthecurvepermitscalculationofanelasticmodulusoftheusuallydefinedtype.Suchaconstantisusefulifitsarbitrarynatureanddependenceontime,temperature,andsimilarfactorsarerealized.1.1Thistestmethodcoversthedeterminationofthetensilepropertiesofunreinforcedandreinforcedplasticsintheformofstandarddumbbell-shapedtestspecimenswhentestedunderdefinedconditionsofpretreatment,temperature,humidity,andtestingmachinespeed.1.2Thistestmethodcanbeusedfortestingmaterialsofanythicknessupto14mm(0.55in.).However,fortestingspecimensintheformofthinsheeting,includingfilmlessthan1.0mm(0.04in.)inthickness,TestMethods【英文标准名称】:Rivets,solid,universalhead,inaluminiumalloy2117,inchbasedseries
【原文标准名称】:铝合金2117通用头型实心铆钉.英制系列
【标准号】:BSEN2144-1994
【标准状态】:现行
【国别】:英国
【发布日期】:1994-12-15
【实施或试行日期】:1994-12-15
【发布单位】:英国标准学会(BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:英制;铝合金;尺寸;铆钉;无螺纹紧固件;作标记;飞行器部件;实心的;优先尺寸;紧固件;温度;名称与符号;直径;质量;尺寸公差
【英文主题词】:Aerospacetransport;Airtransport;Aluminiumalloys;Designations;Dimensions;Fasteners;Fullrivets;Marking;Protrudingheads;Rivets;Round-headrivets;Spacetransport;Specification(approval)
【摘要】:
【中国标准分类号】:H61
【国际标准分类号】:49_030_60
【页数】:12P;A4
【正文语种】:英语