【英文标准名称】:Industrial-processcontrolvalves-Part2-5:Flowcapacity;Sizingequationsforfluidflowthroughmultistagecontrolvalveswithinterstagerecovery
【原文标准名称】:工业过程控制阀.第2-5部分:流通能力.通过有段间恢复能力的多段控制阀门的流体流量的校准公式
【标准号】:IEC60534-2-5-2003
【标准状态】:作废
【国别】:国际
【发布日期】:2003-09
【实施或试行日期】:
【发布单位】:国际电工委员会(IX-IEC)
【起草单位】:IEC/SC65B
【标准类型】:()
【标准水平】:()
【中文主题词】:流量;流体技术;控制阀;流量率;方向控制阀;尺寸选定;流动;阀门;数学计算;过程控制;定义;自动控制系统;过程测量和控制技术;电气工程;过程自动化;流量控制
【英文主题词】:Automaticcontrolsystems;Controlvalves;Definitions;Dimensioning;Direction-controlvalves;Electricalengineering;Flowcapacity;Flowcontrol;Flowrates;Flows;Fluidtechnology;Mathematicalcalculations;Processautomation;Processcontrol;Processmeasuringandcontroltechnology;Valves
【摘要】:Givesequationsforpredictingtheflowofcompressibleandincompressiblefluidsthroughmultistagecontrolvalves.IsbasedonstandardhydrodynamicequationsforNewtonianincompressiblefluids.Isapplicableonlytothosedesignsofmultistagemultip
【中国标准分类号】:N16
【国际标准分类号】:23_060_40
【页数】:64P.;A4
【正文语种】:英语


【英文标准名称】:StandardTestMethodforTensileStrain-HardeningExponents(n-Values)ofMetallicSheetMaterials
【原文标准名称】:金属薄板材拉伸应变硬化指数(n值)的标准试验方法
【标准号】:ASTME646-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【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】:E28.02
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:指数;机械测试;金属;薄板材;拉伸应变;测试
【英文主题词】:
【摘要】:Thistestmethodisusefulforestimatingthestrainattheonsetofneckinginauniaxialtensiontest(1).Practically,itprovidesanempiricalparameterforappraisingtherelativestretchformabilityofsimilarmetallicsystems.Thestrain-hardeningexponentisalsoameasureoftheincreaseinstrengthofamaterialduetoplasticdeformation.Thestrain-hardeningexponentmaybedeterminedovertheentireplasticstress-straincurveoranyportion(s)ofthestress-straincurvespecifiedinaproductspecification.Note38212;Thestraininterval10x2013;20%iscommonlyutilizedfordeterminingthen-valueofformablelowcarbonsteelproducts.Thistestmethodisnotintendedtoapplytoanyportionofthetrue-stressversustrue-straincurvethatexhibitsdiscontinuousbehavior;however,themethodmaybeappliedbycurve-smoothingtechniquesasagreedupon.Note48212;Forexample,thoseportionsofthestress-straincurvesformildsteeloraluminumalloyswhichexhibityield-pointelongationorLuuml;dersbandsmaybecharacterizedasbehavingdiscontinuously.Note58212;Cautionshouldbeobservedintheuseofcurve-smoothingtechniquesastheymayaffectthen-value.Thistestmethodissuitablefordeterminingthetensilestress-strainresponseofmetallicsheetmaterialsintheplasticregionpriortotheonsetofnecking.Then-valuemayvarywiththedisplacementrateorstrainrateused,dependingonthemetalandtesttemperature.1.1Thistestmethodcoversthedeterminationofastrain-hardeningexponentbytensiontestingofmetallicsheetmaterialsforwhichplastic-flowbehaviorobeysthepowercurvegivenintheIntroduction.Note18212;Asinglepowercurvemaynotfittheentirestress-straincurvebetweenyieldandnecking.Ifsuchisthecase,morethanonevalueofthestrain-hardeningexponentcanbeobtained(2).1.2Thistestmethodisformetallicsheetmaterialswiththicknessesofatleast0.005in.(0.13mm)butnotgreaterthan0.25in.(6.4mm).1.3Thevaluesstatedininch-poundunitsaretoberegardedasthestandard.TheSIequivalentsshownmaybeapproximate.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H22
【国际标准分类号】:77_140_50
【页数】:9P.;A4
【正文语种】: