作者:标准资料网 时间:2024-05-16 12:11:26   浏览:8578   来源:标准资料网

【英文标准名称】:StandardTestMethodforOxyacetyleneAblationTestingofThermalInsulationMaterials
【原文标准名称】:热绝缘材料的氧乙炔烧蚀试验的标准试验方法
【标准号】:ASTME285-2008
【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】:E21.08
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:ablation;convection;oxyacetylene;thermalinsulation;Ablativematerials;Calorimeter--aerospaceapplications;Insulationindex;Oxyacetylene
【摘要】:Thistestmethodisintendedtoscreenthemostobviouspoormaterialsfromfurtherconsideration.Sincethecombustiongasesmorecloselyresembletheenvironmentgeneratedinrocketmotors,thistestmethodismoreapplicabletoscreeningmaterialsfornozzlesandmotorlinersthanforaerodynamicheating.Theenvironmentforanyspecifichigh-temperaturethermalprotectionproblemispeculiartothatparticularapplication.Theconditionsgeneratedbytheoxyacetyleneheatsourceinthistestmethodrepresentonlyonesetofconditions;theydonotsimulateanyspecificapplication.Thus,thetestresultscannotbeusedtopredictdirectlythebehaviorofmaterialsforspecificenvironments,norcantheybeusedfordesignpurposes.However,overanumberofyears,thetesthasbeenusefulindeterminingtherelativemeritofmaterials,particularlyinweedingoutobviouslypoormaterialsfrommoreadvanceddata-generationprograms.Ithasalsobeenconsideredforuseasaproductionquality-controltestforrocketinsulationmaterials.Thetesteriscautionedtouseprudenceinextendingtheusefulnessofthetestmethodbeyonditsoriginalintent,namely,screening.Forsituationshavingenvironmentswidelydifferentfromthoseofthetest,theuserisurgedtomodifytheoxyacetyleneburnerconditionstosuithisrequirementsorperhapschangetoadifferentheat-generatingdevicethatprovidesbettersimulation.1.1Thistestmethodcoversthescreeningofablativematerialstodeterminetherelativethermalinsulationeffectivenesswhentestedasaflatpanelinanenvironmentofasteadyflowofhotgasprovidedbyanoxyacetyleneburner.1.2Thistestmethodshouldbeusedtomeasureanddescribethepropertiesofmaterials,products,orassembliesinresponsetoheatandflameundercontrolledlaboratoryconditionsandshouldnotbeusedtodescribeorappraisethefirehazardofmaterials,products,orassembliesunderactualfireconditions.However,resultsofthistestmethodmaybeusedaselementsofafireriskassessmentwhichtakesintoaccountallofthefactorswhicharepertinenttoanassessmentofthefirehazardofaparticularenduse.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.
【中国标准分类号】:Q25
【国际标准分类号】:49_025_99
【页数】:6P.;A4
【正文语种】:英语