基本信息
| 标准名称： | 中同轴综合通信电缆配套12路载波通信设备通用技术要求 |
| 中标分类： |
通信、广播 >>
通信设备 >>
载波通信设备 |
| 发布部门： | 中华人民共和国邮电部 |
| 发布日期： | 1987-01-07 |
| 实施日期： | 1987-07-01 |
| 首发日期： | 1900-01-01 |
| 作废日期： | 1900-01-01 |
| 提出单位： | 邮电部电工业标准化所 |
| 归口单位： | 邮电部电工业标准化所 |
| 起草单位： | 邮电部邮电工业标准化研究所 |
| 起草人： | 胡德龙、范树华、鲁阳 |
| 出版社： | 中国标准出版社 |
| 出版日期： | 1987-07-01 |
| 页数： | 7页 |
适用范围
适用范围：本标准适用于在四管中同轴综合电缆高频四芯组（０．９ｍｍ线径）或八管中同轴综合电缆高频线对（０．９ｍｍ线径）上开通使用的１２＋１２型十二路载波通信设备，本设备主要用于区间通信。
前言
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引用标准
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所属分类： 通信 广播 通信设备 载波通信设备
【英文标准名称】:Plastics-Determinationofflexuralproperties
【原文标准名称】:塑料弯曲性能测定
【标准号】:ISO178-2001
【标准状态】:作废
【国别】:国际
【发布日期】:2001-12
【实施或试行日期】:
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:ISO/TC61
【标准类型】:()
【标准水平】:()
【中文主题词】:抗弯强度;抗弯强度;弯曲试验;刚性;测定;塑料;定义;试验
【英文主题词】:Bendtesting;Bendingstiffness;Bendingstrength;Definitions;Determination;Flexibility;Flexuralcreep;Flexuralstrength;Materialstesting;Plastics;Polymers;Precision;Rigid;Testequipment;Testspecimens;Testing;Thermoplasticpolymers;Thermosettingpolymers;Three-pointloading
【摘要】:1.1ThisInternationalStandardspecifiesamethodfordeterminingtheflexuralpropertiesofrigid(see3.12)andsemi-rigidplasticsunderdefinedconditions.Astandardtestspecimenisdefined,butparametersareincludedforalternativespecimensizesforusewhereappropriate.Arangeoftestspeedsisincluded.1.2Themethodisusedtoinvestigatetheflexuralbehaviour!1]ofthetestspecimensandfordeterminingtheflexuralstrength,flexuralmodulusandotheraspectsoftheflexuralstress/strainrelationshipundertheconditionsdefined.Itappliestoafreelysupportedbeam,loadedatmidspan(three-pointloadingtest).1.3Themethodissuitableforusewiththefollowingrangeofmaterials:—thermoplasticsmouldingandextrusionmaterials,includingfilledandreinforcedcompoundsinadditiontounfilledtypes;rigidthermoplasticssheets;—thermosettingmouldingmaterials,includingfilledandreinforcedcompounds;thermosettingsheets.InagreementwithISO10350-1andISO10350-2,thisInternationalStandardappliestofibre-reinforcedcompoundswithfibrelengths<7,5mmpriortoprocessing.Forlong-fibre-reinforcedmaterials(laminates)withfibrelengths>7,5mm,seereference[2]inthebibliography.Themethodisnotnormallysuitableforusewithrigidcellularmaterialsandsandwichstructurescontainingcellularmaterial!3'4].NOTEForcertaintypesoftextile-fibre-reinforcedplastics,afour-pointbendingtestispreferred.Itisdescribedinreference[2].1.4Themethodisperformedusingspecimenswhichmaybemouldedtothespecifieddimensions,machinedfromthecentralportionofastandardmultipurposetestspecimen(seeISO3167)ormachinedfromfinishedorsemi-finishedproductssuchasmouldings,orextrudedorcastsheet.1.5Themethodspecifiespreferreddimensionsforthetestspecimen.Testswhicharecarriedoutonspecimensofdifferentdimensions,oronspecimenswhicharepreparedunderdifferentconditions,mayproduceresultswhicharenotcomparable.Otherfactors,suchasthetestspeedandtheconditioningofthespecimens,canalsoinfluencetheresults.Especiallyforsemi-crystallinepolymers,thethicknessoftheorientedskinlayer,whichisdependentonmouldingconditionsandthickness,affectstheflexuralproperties.Consequently,whencomparabledataarerequired,thesefactorsmustbecarefullycontrolledandrecorded.1.6Flexuralpropertiescanonlybeusedforengineeringdesignpurposesformaterialswithlinearstress/strainbehaviour.Fornon-linearbehaviour,theflexuralpropertiesareonlynominal.Thebendingtestshouldpreferentiallybeusedwithbrittlematerials,forwhichtensiletestsaredifficult.
【中国标准分类号】:G31
【国际标准分类号】:83_080_01
【页数】:15P;A4
【正文语种】:英语