DIN VDE 0616 T.4-1989 灯座.带灯头S14线形灯

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下一篇: DIN VDE 0633 T.1-1989 定时开关.一般规定

【英文标准名称】:Dimensionsofsquarecores(RM-cores)madeofmagneticoxidesandassociatedparts
【原文标准名称】:磁性氧化物制成的方形磁芯(RM磁芯)及其附件的尺寸
【标准号】:IEC60431-1983
【标准状态】:作废
【国别】:国际
【发布日期】:1983
【实施或试行日期】:
【发布单位】:国际电工委员会(IEC)
【起草单位】:IEC/TC51
【标准类型】:()
【标准水平】:()
【中文主题词】:通信设备;片盘;附件;电信;电气工程;磁的;铁氧体磁心;材料;材料;尺寸;筒管(纺织);氧化物
【英文主题词】:
【摘要】:
【中国标准分类号】:L19
【国际标准分类号】:29_030;29_100_10
【页数】:26P;A4
【正文语种】:英语


【英文标准名称】:TestMethodforDeterminingResidualStressesbytheHole-DrillingStrain-GageMethod
【原文标准名称】:采用钻孔应变测量法测定剩余应力的方法
【标准号】:ANSI/ASTME837-2001
【标准状态】:现行
【国别】:美国
【发布日期】:2001
【实施或试行日期】:2001-10-10
【发布单位】:美国国家标准学会(US-ANSI)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:试验;应力
【英文主题词】:testing;stress
【摘要】:ResidualStressDetermination:Thistestmethodspecifiesahole-drillingprocedurefordeterminingresidualstressprofilesnearthesurfaceofanisotropiclinearlyelasticmaterial.Thetestmethodisapplicabletoresidualstressprofiledeterminationswherein-planestressgradientsaresmall.Thestressesmayremainapproximatelyconstantwithdepth("uniform"stresses)ortheymayvarysignificantlywithdepth("non-uniform"stresses).Themeasuredworkpiecemaybe"thin"withthicknessmuchlessthanthediameterofthedrilledholeor"thick"withthicknessmuchgreaterthanthediameterofthedrilledhole.Onlyuniformstressmeasurementsarespecifiedforthinworkpieces,whilebothuniformandnon-uniformstressmeasurementsarespecifiedforthickworkpieces.StressMeasurementRange:Thehole-drillingmethodcanidentifyin-planeresidualstressesnearthemeasuredsurfaceoftheworkpiecematerial.Themethodgiveslocalizedmeasurementsthatindicatetheresidualstresseswithintheboundariesofthedrilledhole.Thistestmethodappliesincaseswherematerialbehaviorislinear-elastic.Intheory,itispossibleforlocalyieldingtooccurduetothestressconcentrationaroundthedrilledhole,forisotropic(equi-biaxial)residualstressesexceeding50%oftheyieldstress,orforshearstressesinanydirectionexceeding25%oftheyieldstress.However,inpracticeitisfoundthatsatisfactoryresultscanbeachievedprovidingtheresidualstressesdonotexceedabout60%ofthematerialyieldstress.WorkpieceDamage:Thehole-drillingmethodisoftendescribedas"semi-destructive"becausethedamagethatitcausesislocalizedandoftendoesnotsignificantlyaffecttheusefulnessoftheworkpiece.Incontrast,mostothermechanicalmethodsformeasuringresidualstressessubstantiallydestroytheworkpiece.Sinceholedrillingdoescausesomedamage,thistestmethodshouldbeappliedonlyinthosecaseseitherwheretheworkpieceisexpendable,orwheretheintroductionofasmallshallowholewillnotsignificantlyaffecttheusefulnessoftheworkpiece.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H22
【国际标准分类号】:77_040_10
【页数】:
【正文语种】:英语