MIL-E-23765B (AMENDMENT 1)

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MIL-E-23765B (AMENDMENT 1), MILITARY SPECIFICATION,: ELECTRODES AND RODS - WELDING, BARE, SOLID AND ALLOYED CORED, GENERAL SPECIFICATION FOR (15 SEP 1989)., This amendment forms a part of MIL-E-23765B(SH), dated 22 August 19B5,and is approved for use by the Naval Sea Systems Command, Department ofthe Na~, and is available for use by all Departments and Agencies ofthe Department of Defense.
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基本信息
标准名称:反拱形金属爆破片型式与参数
英文名称:Specification and type for reverse domed metallic bursting discs
中标分类: 机械 >> 通用机械与设备 >> 压力容器
ICS分类: 流体系统和通用件 >> 流体存储装置 >> 压力容器、气瓶
替代情况:被GB/T 14566.2-2011代替
发布部门:国家技术监督局
发布日期:1993-08-19
实施日期:1994-02-01
首发日期:1993-08-19
作废日期:2012-06-01
主管部门:国家标准化管理委员会
归口单位:全国锅炉压力容器标准化技术委员会
起草单位:航空工业总公司成都航仪公司
出版社:中国标准出版社
出版日期:1900-01-01
页数:平装16开, 页数:9, 字数:13千字
适用范围

本标准规定了反拱形金属爆破片型式、公称通径、爆破压力范围等。本标准适用于压力容器、管道或其他密闭空间的超压泄放。系统最高工作压力不超过爆破压力的90%。除反拱脱落型爆破片不能承受背压差外,其他各种型式的爆破片均可承受一定的背压差,爆破时爆破片无碎片或整体弹出。反拱脱落带托架型爆破片爆破时,其有效泄放面积是公称泄放面积的40%。本标准不适用于非气相介质的压力系统。

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所属分类: 机械 通用机械与设备 压力容器 流体系统和通用件 流体存储装置 压力容器 气瓶
【英文标准名称】:StandardTestMethodforVickersIndentationHardnessofAdvancedCeramics
【原文标准名称】:高级陶瓷的维氏压痕硬度的标准试验方法
【标准号】:ASTMC1327-2008
【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】:C28.01
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:advancedceramics;cracks;indentation;microscope;Vickershardness;Advancedceramics;Hardness(indentation);Microscopicexamination--advancedceramics;Opticalmicroscopy;Vickershardness(HV)
【摘要】:Foradvancedceramics,Vickersindentersareusedtocreateindentationswhosesurface-projecteddiagonalsaremeasuredwithopticalmicroscopes.TheVickersindentercreatesasquareimpressionfromwhichtwosurface-projecteddiagonallengthsaremeasured.Vickershardnessiscalculatedfromtheratiooftheappliedloadtotheareaofcontactofthefourfacesoftheundeformedindenter.(Incontrast,Knoopindentersarealsousedtomeasurehardness,butKnoophardnessiscalculatedfromtheratiooftheappliedloadtotheprojectedareaonthespecimensurface.)Vickersindentationhardnessisoneofmanypropertiesthatisusedtocharacterizeadvancedceramics.AttemptshavebeenmadetorelateVickersindentationhardnesstootherhardnessscales,butnogenerallyacceptedmethodsareavailable.Suchconversionsarelimitedinscopeandshouldbeusedwithcaution,exceptforspecialcaseswhereareliablebasisfortheconversionhasbeenobtainedbycomparisontests.Vickersindentationdiagonallengthsareapproximately2.8timesshorterthanthelongdiagonalofKnoopindentations,andtheindentationdepthisapproximately1.5timesdeeperthanKnoopindentationsmadeatthesameforce.Vickersindentationsareinfluencedlessbyspecimensurfaceflatness,parallelism,andsurfacefinishthanKnoopindentations,buttheseparametersmustbeconsiderednonetheless.VickersindentationsaremuchmorelikelytocausecracksinadvancedceramicsthanKnoopindentations.Thecracksmayinfluencethemeasuredhardnessbyfundamentallyalteringthedeformationprocessesthatcontributetotheformationofanimpression,andtheymayimpairorprecludemeasurementofthediagonallengthsduetoexcessivedamageattheindentationtipsorsides.Afullhardnesscharacterizationincludesmeasurementsoverabroadrangeofindentationforces.Vickershardnessofceramicsusuallydecreaseswithincreasingindentationsizeorindentationforce.Thetrendisknownastheindentationsizeeffect(ISE).Hardnessapproachesaplateauconstanthardnessatsufficientlylargeindentationsizeorforces.Thetestforcesorloadsthatareneededtoachieveaconstanthardnessvarywiththeceramic.Thetestforcespecifiedinthisstandardisintendedtobesufficientlylargethathardnessiseitherclosetoorontheplateau,butnotsolargeastointroduceexcessivecracking.AcomprehensivecharacterizationoftheISEisrecommendedbutisbeyondthescopeofthistestmethod,whichmeasureshardnessatasingle,designatedforce.1.1ThistestmethodcoversthedeterminationoftheVickersindentationhardnessofadvancedceramics.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Q32
【国际标准分类号】:81_060_99
【页数】:8P.;A4
【正文语种】:英语