Product Code:SAE AIR6185
Title:Lightning Effects on Hydraulic Transport Elements on Composite Aircraft
Issuing Committee:A-6a1 Commercial Aircraft Committee
Scope: This Aerospace Recommended Practice will describe aircraft hydro-mechanical systems design related to the direct and indirect effects of lightning strikes. Stress and other design factors for hydraulic system components, electrical bonding, electrical control and monitoring, composite aircraft structures, and electromagnetic effects will be addressed.
Rationale: This Aerospace Recommended Practice will describe aircraft hydro-mechanical systems design related to the direct and indirect effects of lightning strikes. Stress and other design factors for hydraulic system components, electrical bonding, electrical control and monitoring, composite aircraft structures, and electromagnetic effects will be addressed.【英文标准名称】:StandardTestMethodforThermalStabilityofOrganicHeatTransferFluids
【原文标准名称】:有机导热传输液体热稳定性的标准试验方法
【标准号】:ASTMD6743-2006
【标准状态】:现行
【国别】:
【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】:D02.L0.06
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:热力工程;传热液体;传热介质;材料试验;试验;热稳定性
【英文主题词】:heattransferfluids;thermaldegradation;thermalfluids;thermalstability
【摘要】:Heattransferfluidsdegradewhenexposedtosufficientlyhightemperatures.Theamountofdegradationincreasesasthetemperatureincreasesorthelengthofexposureincreases,orboth.Duetoreactionsandrearrangement,degradationproductscanbeformed.Degradationproductsincludehighandlowboilingcomponents,gaseousdecompositionproducts,andproductsthatcannotbeevaporated.Thetypeandcontentofdegradationproductsproducedwillchangetheperformancecharacteristicsofaheattransferfluid.Inordertoevaluatethermalstability,itisnecessarytoquantitativelydeterminethemasspercentagesofhighandlowboilingcomponents,aswellasgaseousdecompositionproductsandthosethatcannotbevaporized,inthethermallystressedheattransferfluid.Thistestmethoddifferentiatestherelativestabilityoforganicheattransferfluidsatelevatedtemperaturesintheabsenceofoxygenandwaterundertheconditionsofthetest.Theusershalldeterminetohisownsatisfactionwhethertheresultsofthistestmethodcorrelatetofieldperformance.Heattransferfluidsinindustrialplantsareexposedtoavarietyofadditionalinfluencingvariables.Interactionwiththeplantrsquo;materials,impurities,heatbuild-upduringimpairedflowconditions,thetemperaturedistributionintheheattransferfluidcircuit,andotherfactorscanalsoleadtochangesintheheattransferfluid.Thetestmethodprovidesanindicationoftherelativethermalstabilityofaheattransferfluid,andcanbeconsideredasonefactorinthedecision-makingprocessforselectionofafluid.Theaccuracyoftheresultsdependsverystronglyonhowcloselythetestconditionsarefollowed.Thistestmethoddoesnotpossessthecapabilitytoquantifyorotherwiseassesstheformationandnatureofthermaldecompositionproductswithintheunstressedfluidboilingrange.Decompositionproductswithintheunstressedfluidboilingrangemayrepresentasignificantportionofthetotalthermaldegradation.1.1Thistestmethodcoversthedeterminationofthethermalstabilityofunusedorganicheattransferfluids.Theprocedureisapplicabletofluidsusedforthetransferofheatattemperaturesbothaboveandbelowtheirboilingpoint(referstonormalboilingpointthroughoutthetextunlessotherwisestated).Itisapplicabletofluidswithmaximumbulkoperatingtemperaturebetween260176;C(500176;F)and454176;C(850176;F).Theprocedureshallnotbeusedtotestafluidaboveitscriticaltemperature.Inthistestmethod,thevolatiledecompositionproductsareincontinuouscontactwiththefluidduringthetest.Thistestmethodwillnotmeasurethethermalstabilitythreshold(thetemperatureatwhichvolatileoilfragmentsbegintoform),butinsteadwillindicatebulkfragmentationoccurringforaspecifiedtemperatureandtestingperiod.Becausepotentialdecompositionandgenerationofhighpressuregasmayoccurattemperaturesabove260176;C(500176;F),donotusethistestmethodforaqueousfluidsorotherfluidswhichgeneratehigh-pressuregasatthesetemperatures.1.2DINNorm51528coversatestmethodthatissimilartothistestmethod.1.3Theapplicabilityofthistestmethodtosiloxane-basedheattransferfluidshasnotbeendetermined.1.4si-value;Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Forspecificwarningstatements,see7.2,8.8,8.9,and8.10.
【中国标准分类号】:G71;J75
【国际标准分类号】:27_060_30;71_100_99
【页数】:5P.;A4
【正文语种】: