【英文标准名称】:StandardPracticeforSteelCastings,Welding,QualificationsofProceduresandPersonnel
【原文标准名称】:焊接钢铸件、程序评定和人员的标准操作规程
【标准号】:ASTMA488/A488M-1999
【标准状态】:作废
【国别】:美国
【发布日期】:1999
【实施或试行日期】:
【发布单位】:美国材料与试验协会(ASTM)
【起草单位】:ASTM
【标准类型】:()
【标准水平】:()
【中文主题词】:训练;人员;质量保证;铸件;钢;焊接;检验
【英文主题词】:training;castings;welding;personnel;inspection;qualityassurance;steels
【摘要】:
【中国标准分类号】:J31
【国际标准分类号】:25_160_10
【页数】:15P;A4
【正文语种】:英语


【英文标准名称】:StandardTestMethodforStrengthPropertiesofAdhesiveBondsinShearbyCompressionLoading
【原文标准名称】:用压缩荷载法测定胶粘剂的抗剪切强度性能的标准试验方法
【标准号】:ASTMD905-2008e1
【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】:D14.30
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:粘着性的
【英文主题词】:adhesive;bond;compression;compressionloading;shear;strengthproperties;Bondstrength--adhesives(wood-to-wood);Compressiontesting--adhesives;Sheartesting--adhesives;Strength--adhesives;Adhesives(wood);Woodproducts(adhesives);Adhesivebon
【摘要】:Itcannotbeassumedthatthistestmethodmeasuresthetrueshearstrengthoftheadhesivebond.Manyfactorsinterfereorbiasthemeasurementincludingthestrengthofthewood,thespecimen,thesheartooldesignsthemselves,andtherateofloading.Woodfailureisverycommoninjointsmadewithstrongadhesives.Althoughhighwoodfailureisnormallydesired,whenitoccursthemeasuredstrengthislowerthanthetrueadhesivebondstrength.Stressconcentrationsatthenotchesofthespecimentendtolowerthemeasuredstrength.Inasimilartestfortheshearstrengthofsolidwood,TestMethodsD143,theseeffectsareselfcorrectingsothatthemeasuredstrengthisclosetothetrueshearstrengthofthewood.Byanalogythesamemaybetrueinthistestmethod,however,otherfactorsarealsoinvolvedandmayaltertherelationship.Therateofloadingaffectsthestrengthofanadhesivebondaccordingtotheadhesive''srheologicalproperties.Themoreviscoelasticorplastictheadhesive,thegreatereffect.Thermosettingadhesiveslikeurea-andphenol-formaldehydeareelastic.Theirbondstrengthscanbemeasuredoverarangeofloadingratefrom0.038to1.27cm/min[0.015to0.5in./min]withnoapparentaffect.Thermoplasticadhesiveslikepolyvinylacetate,hotmelts,andelastomer-basedadhesivesexhibitabroadrangeofelastic,viscoelastic,andplasticbehaviors.Theirbondstrengthswillbeaffectedtovaryingdegreesbychangingtheloadingrate.Generally,increasingtherate,increasesthemeasuredstrength.Thistestmethodissuitableforproductresearchanddevelopment,qualifyingadhesivesinaccordancewithcertainproductorperformancespecifications,andmonitoringbondingprocesscontrol.Thistestmethodmaybesuitableforcomparingandselectingadhesives,however,suchcomparisonsmustbemadewithcautionsincethemeasuredstrengthofsomeadhesivesmaybedifferentindifferenttypesofjoints.Strengthvaluesobtainedbythistestmethodarenotsuitableasdesignshearstrengthsvalueswithoutadjustmentbycertainengineeringdesignfactors.1.1Thistestmethodcoversthedeterminationofthecomparativeshearstrengthsofadhesivebondsusedforbondingwoodandothersimilarmaterials,whentestedonastandardspecimenunderspecifiedconditionsofpreparation,conditioning,andloadingincompression.Thistestmethodisintendedprimarilyasanevaluationofadhesivesforwood.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninbracketsareprovidedforinformationpurposesonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:G38
【国际标准分类号】:83_180
【页数】:5P.;A4
【正文语种】:英语