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ASTM A 833-1984 用比较硬度测试仪测量金属材料的压痕硬性

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【英文标准名称】:StandardPracticeforIndentationHardnessofMetallicMaterialsbyComparisonHardnessTesters
【原文标准名称】:用比较硬度测试仪测量金属材料的压痕硬性
【标准号】:ASTMA833-1984
【标准状态】:作废
【国别】:美国
【发布日期】:1984
【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】:硬度测试仪;金属;压痕硬性;轴承;硬度;试验
【英文主题词】:Bearings;Hardness;Hardnesstesters;Indentationhardness;Metals;Testing
【摘要】:
【中国标准分类号】:H23
【国际标准分类号】:77_040_10
【页数】:2P;A4
【正文语种】:英语


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Product Code:SAE AS3484
Title:Gasket - 37掳 Flared Tube Fitting, Nickel, AMS 5553 (NONCURRENT Feb 1998)
Issuing Committee:E-25 General Standards For Aerospace And Propulsion Systems
Scope:Scope unavailable.【英文标准名称】:StandardTestMethodforMeasuringRollingFrictionCharacteristicsofaSphericalShapeonaFlatHorizontalPlane
【原文标准名称】:在平坦水平面上测量球形滚动摩擦特性的标准试验方法
【标准号】:ASTMG194-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:G02.50
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:balls;coefficientofrollingfriction;plane;rollingfriction;spheres
【摘要】:Rollingfrictionlikeslidingfrictiondependsuponmanyfactors.Itisasystemeffectthatinvolvesthenatureoftherollingsurfaceandthecounterface.Theslidingfrictionforce(F)isusuallyconsideredtobethesumofforcesarisingfromdeformationsofsurfacefeatures(Fs),fromattractiveforces(atomic,molecular,etc.)atcontactpoints(Fa)andforcefrominteractionoffilmsandparticulatesontherubbingsurfaces(Ff):Therollingfrictionforceincludestheseforcecontributionspluseffectsfromtherelativestiffnessofthecontactingsurfaces,thediameter(curvature)ofthesphericalshape(ball,orange,etc.)andotherfactors.Becausetherearesomanyfactorsinvolvedinarollingtribosystem,rollingresistancecanbestbequantifiedbyanactualtestofthesphereofinterestontheintendedcounterface,asinthistestmethod.Therearecountlessapplicationswhereitisimportanttoquantifytherollingcharacteristicsofaparticularsphericalshapeonaparticularsurface.Theinterlaboratorytestsconductedforthistestmethodwereperformedonhardenedsteelballslikethoseusedinballbearings.Thistestmethodcouldbeusedtoassesstheeffectofdifferentcounterfacesurfacesontherollingcharacteristicsofballsforballbearings.Conversely,itcouldbeusedasaqualitycontroltestonballs.Surfaceimperfections/defects/films,etc.ontheballscanaffecthowtheyroll:thedistancetraveledonacommoncounterface.5.3Industrialapplicationsofthistestmethodcanincludeassessingconveyingsurfacesforsphericalornearlyspecialparts:checkvalveballs,cabinetknobs,Christmasornaments,toiletfloats,etc.Manymedicaldevicesusespecialshapeswhererollingcharacteristicsareaconsideration.Similarly,manypharmaceuticalproducts(pills)aresphericalornearlysphericalinshape,andthistestmethodcanbeusedtoassessrollingcharacteristicsforconveyingorotherreasonssuchassize(mass)check.5.4Rollingfrictionofsphericalshapescanbeaconsiderationincountlesssports(soccer,golf,lacrosse,etc.)andgameapplications(billiards,bocce,toys,etc.).Thistestmethodcanbeusedtoranktherollingresistanceofdifferentballcompositions,masses,shapes,surfacetextures,design,stiffness,etc.Similarly,thetestmethodcanbeusedtoassesstheeaseofrollingofballsondifferentplayingorgamesurfaces.5.5Thistestmethodisveryapplicabletosphericalormostlysphericalfoodproducts.Forexample,itiscommontouserollingdistanceofapples,citrus,nuts,etc.toclassifythembysizeformarketing.Theyarerolleddownanangledsurfaceandtherollingdistancebecomesafunctionofsize(mass/diameter).Thistestmethodcanbeusedtoassessthesuitabilityofvariousrollingsurfaces(carpet,metal,wood,etc.)forsuitabilityinclassificationequipment.Itcouldalsobeusedforfoodconveyanceonspherical-shapedprocessedfoods(gumballs,hardcandy,meatballs,etc.)5.6Finally,thistestmethodcanbeavaluableteachingtoolforphysicsandtribologystudents.Theequipmentissimple,lowcostandstudentproof.Itcanbeusedtodemonstratetheconceptofrollingfrictionandthefactorsthataffectit.1.1Thistestmethodcoverstheuseofanangledlaunchramptoinitiaterollingofasphereornearlysphericalshapeonaflathorizontalsurfacetodeterminetherollingfrictioncharacteristicsofagivensphericalshapeonagivensurface.1.1.1Steelballsonasurfaceplatewereusedininterlaboratorytests(seeAppendixX1).Golfballsonagreen,soccerandlacrosseballsonplayingsurfaces,b......
【中国标准分类号】:J04
【国际标准分类号】:17_040_20
【页数】:9P.;A4
【正文语种】:英语