ASTM D7078/D7078M-2005 用v型切口梁剪切试验测定复合材料剪切特性的标准试验方法

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【英文标准名称】:StandardTestMethodforShearPropertiesofCompositeMaterialsbyV-NotchedRailShearMethod
【原文标准名称】:用v型切口梁剪切试验测定复合材料剪切特性的标准试验方法
【标准号】:ASTMD7078/D7078M-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】:美国材料与试验协会(US-ASTM)
【起草单位】:D30.04
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:compositematerials;in-planeshear;interlaminarshear;shearmodulus;shearproperties;shearstrength;sheartesting
【摘要】:Thissheartestisdesignedtoproduceshearpropertydataformaterialspecifications,researchanddevelopment,qualityassurance,andstructuraldesignandanalysis.Eitherin-planeorinterlaminarshearpropertiesmaybeevaluated,dependingupontheorientationofthematerialcoordinatesystemrelativetotheloadingaxis.Factorsthatinfluencetheshearresponseandshouldthereforebereportedinclude:material,methodsofmaterialpreparationandlay-up,specimenstackingsequence,specimenpreparation,specimenconditioning,environmentoftesting,specimenalignmentandgripping,speedoftesting,timeattemperature,voidcontent,andvolumepercentreinforcement.Inanisotropicmaterials,propertiesmaybeobtainedinanyofthesixpossibleshearplanesbyorientingthetestingplaneofthespecimenwiththedesiredmaterialplane(1-2or2-1,1-3or3-1,2-3or3-2).Onlyasingleshearplanemaybeevaluatedforanygivenspecimen.Properties,inthetestdirection,whichmaybeobtainedfromthistestmethod,includethefollowing:5.2.1Shearstressversusengineeringshearstrainresponse,5.2.2Ultimateshearstrength,5.2.3Ultimateengineeringshearstrain,5.2.4Shearchordmodulusofelasticity,5.2.5Transitionstrain.1.1Thistestmethodcoversthedeterminationoftheshearpropertiesofhigh-modulusfiber-reinforcedcompositematerialsbyclampingtheendsofaV-notchedspecimenbetweentwopairsofloadingrails.Whenloadedintension,therailsintroduceshearforcesintothespecimenthroughthespecimenfaces.Incomparison,thespecimenofTestMethodD5379/D5379Misloadedthroughitstopandbottomedges.Faceloadingallowshighershearforcestobeappliedtothespecimen,ifrequired.Additionally,thepresenttestmethodutilizesaspecimenwithalargergagesectionthantheV-notchedspecimenofTestMethodD5379/D5379M.Inbothtestmethods,theuseofaV-notchedspecimenincreasesthegagesectionshearstressesinrelationtotheshearstressesinthevicinityofthegrips,thuslocalizingthefailurewithinthegagesectionwhilecausingtheshearstressdistributiontobemoreuniformthaninaspecimenwithoutnotches.Incomparison,TestMethodD4255/D4255Mutilizesanunnotchedspecimenclampedbetweentwopairsofloadingrailsthatareloadedintension.AlsoincontrasttoTestMethodD4255/D4255M,thepresenttestmethodprovidesspecimengrippingwithouttheneedforholesinthespecimen.Thecompositematerialsarelimitedtocontinuous-fiberordiscontinuous-fiber-reinforcedcompositesinthefollowingmaterialforms:1.1.1Laminatescomposedonlyofunidirectionalfibrouslaminae,withthefiberdirectionorientedeitherparallelorperpendiculartothefixturerails.1.1.2Laminatesofbalancedandsymmetricconstruction,withthe0directionorientedeitherparallelorperpendiculartothefixturerails.1.1.3Laminatescomposedofwoven,braided,orknittedfabricfilamentarylaminae.1.1.4Short-fiber-reinforcedcompositeswithamajorityofthefibersbeingrandomlydistributed.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Withinthetexttheinch-poundunitsareshowninbrackets.Thevaluesstatedineachsystemarenotexactequivalents;therefore,eachsystemmustbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththestandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuse......
【中国标准分类号】:G31
【国际标准分类号】:83_140_20
【页数】:15P.;A4
【正文语种】:英语