作者:标准资料网 时间:2024-05-18 22:57:51   浏览:9895   来源:标准资料网

【英文标准名称】:StandardTestMethodforCoreShearPropertiesofSandwichConstructionsbyBeamFlexure
【原文标准名称】:通过梁柔性构造叠合板中心剪切特性的标准试验方法
【标准号】:ASTMC393/C393M-2006
【标准状态】:现行
【国别】:美国
【发布日期】:2006
【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】:D30.09
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:bendingstress;coremodulus;corestress;facingstress;sandwichconstruction;sandwichdeflection;shearstress
【摘要】:Flexuretestsonflatsandwichconstructionmaybeconductedtodeterminethesandwichflexuralstiffness,thecoreshearstrengthandshearmodulus,orthefacingscompressiveandtensilestrengths.Teststoevaluatecoreshearstrengthmayalsobeusedtoevaluatecore-to-facingbonds.Thistestmethodislimitedtoobtainingthecoreshearstrengthorcore-to-facingshearstrengthandthestiffnessofthesandwichbeam,andtoobtainingload-deflectiondataforuseincalculatingsandwichbeamflexuralandshearstiffnessusingPracticeD7250.Note18212;CoreshearstrengthandshearmodulusarebestdeterminedinaccordancewithTestMethodC273providedbarecorematerialisavailable.FacingstrengthisbestdeterminedinaccordancewithTestMethodD7249.PracticeD7250coversthedeterminationofsandwichflexuralandshearstiffnessandcoreshearmodulususingcalculationsinvolvingmeasureddeflectionsofsandwichflexurespecimens.Thistestmethodcanbeusedtoproducecoreshearstrengthandcore-to-facingshearstrengthdataforstructuraldesignallowables,materialspecifications,andresearchanddevelopmentapplications;itmayalsobeusedasaqualitycontroltestforbondedsandwichpanels.Factorsthatinfluencetheshearstrengthandshallthereforebereportedincludethefollowing:facingmaterial,corematerial,adhesivematerial,methodsofmaterialfabrication,coregeometry(cellsize),coredensity,adhesivethickness,specimengeometry,specimenpreparation,specimenconditioning,environmentoftesting,specimenalignment,loadingprocedure,speedoftesting,andadhesivevoidcontent.Further,core-to-facingstrengthmaybedifferentbetweenprecured/bondedandco-curedfacingsinsandwichpanelswiththesamecoreandfacingmaterial.Note28212;Concentratedloadsonbeamswiththinfacingsandlowdensitycorescanproduceresultsthataredifficulttointerpret,especiallyclosetothefailurepoint.Widerloadpadswithrubberpadsmayassistindistributingtheloads.1.1Thistestmethodcoversdeterminationofthecoreshearpropertiesofflatsandwichconstructionssubjectedtoflexureinsuchamannerthattheappliedmomentsproducecurvatureofthesandwichfacingplanes.Permissiblecorematerialformsincludethosewithcontinuousbondingsurfaces(suchasbalsawoodandfoams)aswellasthosewithdiscontinuousbondingsurfaces(suchashoneycomb).1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Withinthetexttheinch-poundunitsareshowninbrackets.Thevaluesstatedineachsystemarenotexactequivalents;therefore,eachsystemmustbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththestandard.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Q23
【国际标准分类号】:83_120
【页数】:8P.;A4
【正文语种】:英语