【英文标准名称】:StandardTestMethodforTear-PropagationResistance(TrouserTear)ofPlasticFilmandThinSheetingbyaSingle-TearMethod
【原文标准名称】:用一次撕裂法测定塑料薄膜与薄板的抗撕裂扩展性的标准试验方法
【标准号】:ASTMD1938-2008
【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】:D20.19
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:plasticfilm;singletear;tear;tear-propagation;thinsheeting;trouser;Plasticsheetandfilm--tearresistance;Single-tearmethod;Tearresistance;Thinsheeting;Trousertear
【摘要】:Thistestmethodisofvalueinratingthetear-propagationresistanceofvariousplasticfilmsandthinsheetingofcomparablethickness.Forhighlyextensiblefilmorsheetingthedeformationenergyofthespecimenlegsissignificantlygreaterthanthetearingenergy.Thetear-propagationresistanceinslightlyextensibleornon-extensiblefilmorsheetingisdistinguishedfromthetear-propagationresistanceinhighlyextensiblefilmorsheetingbytheload-timeorload-displacementdata,(Fig.1andFig.2).Thetear-propagationforceforslightlyextensibleornon-extensiblematerialisdeterminedfromtheaveragetearforceversustheinitialandpeakforceforahighlyextensiblematerial.Thistestmethodshallbeusedforspecificationacceptancetestingonlyafterithasbeendemonstratedthatthedatafortheparticularmaterialareacceptablyreproducible.Thedataobtainedbythistestmethodfurnishinformationforrankingthetear-propagationresistanceofplasticfilmsandsheetingofsimilarcomposition.Actualuseperformancemaynotnecessarilycorrelatewithdatafromthistestmethod.Setsofdatafromspecimensofdissimilarthicknessareusuallynotcomparable.Beforeproceedingwiththistestmethod,referenceshouldbemadetothespecificationofthematerialbeingtested.Anytestspecimenpreparation,conditioning,dimensions,ortestingparameters,orcombinationthereof,coveredintherelevantASTMmaterialspecificationshalltakeprecedenceoverthosementionedinthistestmethod.IftherearenorelevantASTMmaterialspecifications,thenthedefaultconditionsapply.Table1ofClassificationSystemsD4000liststheASTMmaterialsstandardsthatcurrentlyexist.FIG.1Load-TimeChartforLow-ExtensibleFilmFIG.2Load-TimeChartforHighlyExtensibleFilm1.1Thistestmethodcoversthedeterminationoftheforcenecessarytopropagateatearinplasticfilmandthinsheeting(thicknessof1mm(0.04in.)orless)byasingle-tearmethod.Themethodisnotapplicableforfilmorsheetingmaterialwherebrittlefailuresoccurduringtesting.Note18212;Filmhasbeenarbitrarilydefinedassheetinghavingnominalthicknessnotgreaterthan0.25mm(0.010in.).1.2Constant-Rate-of-GripSeparationTest8212;Thistestmethodemploysaconstantrateofseparationofthegripsholdingthetestspecimen.1.2.1Specimenextensionmaybemeasuredinthistestmethodbygripseparation.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesareprovidedforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Note28212;ThisstandardissimilartoISO6383-1,butisnotconsideredtechnicallyequivalent.ThespecimensizeforISO6383-1islarger,andthemethodspecifiesdifferenttestspeeds.
【中国标准分类号】:G33
【国际标准分类号】:83_140_10
【页数】:4P.;A4
【正文语种】:英语


MIL-STD-2042B, DEPARTMENT OF DEFENSE STANDARD PRACTICE: FIBER OPTIC TOPOLOGY INSTALLATION STANDARD METHODS FOR NAVAL SHIPS (25 JUL 2002)., This standard practice provides detailed information and guidance to personnel concerned with the installation of fiber optic cable topologies (optical fiber cabling and associated components) on Naval surface ships and submarines. The methods specified herein are not identifiable to any specific ship class or type, but are intended to standardize and minimize variations in installation methods to enhance the compatibility of the installations on all Naval ships. In order to provide flexibility in the use and update of the installation methods, this standard practice is issued in eight parts; the basic standard practice and seven numbered parts as follows: Part 1 Cables, Part 2 Equipment, Part 3 Cable Penetrations, Part 4 Cableways, Part 5 Connectors and Interconnections, Part 6 Tests, Part 7 Pierside Connectivity, & Cable Assemblies and Interconnection Hardware.