【英文标准名称】:StandardTestMethodforModeIFatigueDelaminationGrowthOnsetofUnidirectionalFiber-ReinforcedPolymerMatrixComposites
【原文标准名称】:单向纤维增强聚合基质复合物的模式1疲劳分层增长开始的标准试验方法
【标准号】:ASTMD6115-1997(2004)
【标准状态】:现行
【国别】:
【发布日期】:1997
【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】:D30.06
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:compositematerials;delamination;doublecantileverbeam;frequency;maximumcyclicstainenergyreleaserate;modeI;onsetoffatiguedelaminationgrowth
【摘要】:Susceptibilitytodelaminationisoneofthemajorweaknessesofmanyadvancedlaminatedcompositestructures.Knowledgeofalaminatedcompositematerialrsquo;resistancetointerlaminarfractureunderfatigueloadsisusefulforproductdevelopmentandmaterialselection.Furthermore,ameasurementoftherelationshipofthemodeIcyclicstrainenergyreleaserateandthenumberofcyclestodelaminationgrowthonset,Gx2013;N,thatisindependentofspecimengeometryormethodofloadintroduction,isusefulforestablishingdesignallowablesusedindamagetoleranceanalysesofcompositestructuresmadefromthesematerials.Thistestmethodcanservethefollowingpurposes:5.2.1Toestablishquantitativelytheeffectsoffibersurfacetreatment,localvariationsinfibervolumefraction,andprocessingandenvironmentalvariablesonGx2013;Nofaparticularcompositematerial.5.2.2TocomparequantitativelytherelativevaluesofGx2013;Nforcompositematerialswithdifferentconstituents.5.2.3Todevelopcriteriaforavoidingtheonsetofdelaminationgrowthunderfatigueloadingforcompositedamagetoleranceanddurabilityanalyses.1.1Thistestmethoddeterminesthenumberofcycles(N)fortheonsetofdelaminationgrowthbasedontheopeningmodeIcyclicstrainenergyreleaserate(G),usingtheDoubleCantileverBeam(DCB)specimenshownin.Thistestmethodappliestoconstantamplitude,tension-tensionfatigueloadingofcontinuousfiber-reinforcedcompositematerials.WhenthistestmethodisappliedtomultiplespecimensatvariousG-levels,theresultsmaybeshownasaG-Ncurve,asillustratedinFig2.1.2Thistestmethodislimitedtousewithcompositesconsistingofunidirectionalcarbonfibertapelaminateswithsingle-phasepolymermatrices.Thislimitedscopereflectstheexperiencegainedinroundrobintesting.Thistestmethodmayproveusefulforothertypesandclassesofcompositematerials,however,certaininterferenceshavebeennoted(seeSection6.5ofTestMethodD5528).1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesprovidedinparenthesesareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:G31
【国际标准分类号】:83_120
【页数】:6P.;A4
【正文语种】:


Product Code:SAE J1014
Title:Classification and Nomenclature Towing Winch for Skidders and Crawler Tractors
Issuing Committee:Mtc4, Forestry And Logging Equipment
Scope:This SAE Standard includes only those towing winches commonly used on skidders and crawler tractors. These winches are used on self-propelled machines described in SAE J1057; J1116; and J1209. Specifically excluded are those winches used for hoisting operations.This document classifies the major types of winch and establishes nomenclature for major winch components. Examples used here are not intended to include all existing winches nor to be descriptive of any particular winch.