【英文标准名称】:Plastics-Determinationoffracturetoughness(GicandKic)atmoderatelyhighloadingrates(1m/s)
【原文标准名称】:在适度高负载率(1m/s)下(GDOWNiDOWNc和KDOWNiDOWNc)抗断裂韧性的测定
【标准号】:BSISO17281-2002
【标准状态】:现行
【国别】:英国
【发布日期】:2002-11-22
【实施或试行日期】:2002-11-22
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:断裂试验;测定;机械试验;裂纹;裂开;塑料;断裂韧性;抗断裂强度;机械处理;试样制备;试验
【英文主题词】:Breakingstrength;Breakingtests;Cracktoughness;Cracking;Determination;Flaws;Fracturetoughness;Mechanicaltesting;Mechanicaltreatment;Plastics;Specimenpreparation;Testing
【摘要】:ThisInternationalStandardprovidesguidelinesfordeterminingthefracturetoughnessofplasticsinthecrack-openingmode(ModeI)byalinearelasticfracturemechanics(LEMF)approach,atload-pointdisplacementratesofupto1m/s.ItsupplementsISO13586soastoextenditsapplicabilitytoloadingratessomewhathigherthanisthecaseinthescopeofthelatterInternationalStandard.Fracturetestingathighloadingratespresentsspecialproblemsbecauseofthepresenceofdynamiceffects:vibrationsinthetestsystemproducingoscillationsintherecordedquantities,andinertialloadsproducingforcesonthetestspecimendifferentfromtheforcessensedbythetestfixture.Theseeffectsneedeithertobecontrolledand,ifpossible,reducedbyappropriateaction,orelsetobetakenintoaccountthroughproperanalysisofthemeasureddata.Therelativeimportanceofsucheffectsincreaseswithincreasingtestingrate(decreasingtestduration).Atspeedsoflessthan0,1m/s(loadingtimesofgreaterthan10ms)thedynamiceffectsmaybenegligibleandthetestingproceduregiveninISO13586canbeappliedasitstands.Atspeedsapproaching1m/s(loadingtimesoftheorderof1ms)thedynamiceffectsmaybecomesignificantbutstillcontrollable.TheproceduregiveninISO13586canstillbeusedthoughwithsomeprovisosandthesearecontemplatedinthisInternationalStandard.Atspeedsofseveralmeterspersecondandhigher(loadingtimesmarkedlyshorterthan1ms)thedynamiceffectsbecomedominant,anddifferentapproachestofracturetoughnessdeterminationarerequired,whichareoutsidethescopeofthisInternationalStandard.Thegeneralprinciples,methodsandrulesgiveninISO13586forfracturetestingatlowloadingratesremainvalidandshouldbefollowedexceptwhereexpresslystatedotherwiseinthisInternationalStandard.ThemethodsaresuitableforusewiththesamerangeofmaterialsascoveredbyISO13586.Althoughthedynamiceffectsoccurringathighloadingratesarelargelydependentonthematerialtestedaswellasonthetestequipmentandtestgeometryused,theguidelinesgivenherearevalidingeneral,irrespectiveoftestequipment,testgeometryandmaterialtested.Thesamerestrictionsastolinearityoftheload-displacementdiagram,specimensizeandnotchtipsharpnessapplyasforISO13586.Thelinearityrequirementsreferredtoin6.1ofISO13586:2000,areverifiedhereonthe"smoothed"load-displacementcurve,tobeobtainedasspecifiedin8.1.
【中国标准分类号】:G31
【国际标准分类号】:83_080_01
【页数】:32P.;A4
【正文语种】:英语
基本信息
标准名称: | 真空管式高频感应加热电源装置 |
中标分类: |
电工 >>
电气设备与器具 >>
工业电热设备 |
发布部门: | 全国工业电热设备标准化技术委员会 |
发布日期: | 1991-06-28 |
实施日期: | 1992-07-01 |
首发日期: | 1900-01-01 |
作废日期: | 1900-01-01 |
归口单位: | 全国工业电热设备标准化技术委员会 |
出版日期: | 1900-01-01 |
页数: | 12 页 |
批文号: | 机电科标[1991]1082号 |
适用范围
本标准规定了对真空管式高频感应加热电源装置的各项要求,包括产品分类、技术要求、试验方法、检验规则、等级划分、标志、包装、运输、贮存、订购和供货等。 本标准适用于真空管式高频感应加热电源装置,该装置可作为表面与局部加热淬火、透热、熔炼和焊接等高频感应加热设备的电源。
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所属分类: 电工 电气设备与器具 工业电热设备