ASTM C 446-1988 管道用预制隔热材料的断裂载荷和计算扰折模数的试验方法

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【英文标准名称】:StandardTestMethodforDynamicYoung''sModulus,ShearModulus,andPoisson''sRatiobySonicResonance
【原文标准名称】:利用回声共振测试动态杨氏模量、剪切模数和泊松比的标准试验方法
【标准号】:ASTME1875-2008
【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】:E28.04
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:dynamic;elasticmodulus;elasticproperties;Poisson'sratio;resonance;resonantbeam;shearmodulus;Young'smodulus;DynamicYoung'smodulus;Modulusofelasticity;Poisson'sratio;Shearmodulus;Sonicresonance;Young'smodulus
【摘要】:Thistestmethodhasadvantagesincertainrespectsovertheuseofstaticloadingsystemsformeasuringmoduli.Thistestmethodisnondestructiveinnature.Onlyminutestressesareappliedtothespecimen,thusminimizingthepossibilityoffracture.Theperiodoftimeduringwhichmeasurementstressisappliedandremovedisoftheorderofhundredsofmicroseconds.Withthistestmethoditisfeasibletoperformmeasurementsathightemperatures,wheredelayedelasticandcreepeffectswouldinvalidatemodulusmeasurementscalculatedfromstaticloading.Thistestmethodissuitablefordetectingwhetheramaterialmeetsspecifications,ifcognizanceisgiventooneimportantfactinmaterialsareoftensensitivetothermalhistory.Therefore,thethermalhistoryofatestspecimenmustbeconsideredincomparingexperimentalvaluesofmodulitoreferenceorstandardvalues.Specimendescriptionsshouldincludeanyspecificthermaltreatmentsthatthespecimenshavereceived.1.1Thistestmethodcoversthedeterminationofthedynamicelasticpropertiesofelasticmaterials.Specimensofthesematerialspossessspecificmechanicalresonantfrequenciesthataredeterminedbytheelasticmodulus,mass,andgeometryofthetestspecimen.Therefore,thedynamicelasticpropertiesofamaterialcanbecomputedifthegeometry,mass,andmechanicalresonantfrequenciesofasuitabletestspecimenofthatmaterialcanbemeasured.DynamicYoung''smodulusisdeterminedusingtheresonantfrequencyintheflexuralmodeofvibration.Thedynamicshearmodulus,ormodulusofrigidity,isfoundusingtorsionalresonantvibrations.DynamicYoung''smodulusanddynamicshearmodulusareusedtocomputePoisson''sratio.1.2Thistestmethodisspecificallyappropriateformaterialsthatareelastic,homogeneous,andisotropic(1).Materialsofacompositecharacter(particulate,whisker,orfiberreinforced)maybetestedbythistestmethodwiththeunderstandingthatthecharacter(volumefraction,size,morphology,distribution,orientation,elasticproperties,andinterfacialbonding)ofthereinforcementinthetestspecimenwillhaveadirecteffectontheelasticproperties.Thesereinforcementeffectsmustbeconsideredininterpretingthetestresultsforcomposites.Thistestmethodisnotsatisfactoryforspecimensthathavecracksorvoidsthataremajordiscontinuitiesinthespecimen.Neitheristhetestmethodsatisfactorywhenthesematerialscannotbefabricatedinauniformrectangularorcircularcrosssection.1.3Ahigh-temperaturefurnaceandcryogeniccabinetaredescribedformeasuringthedynamicelasticmoduliasafunctionoftemperaturefromx2013;195to1200x00B0;C.1.4Modificationofthistestmethodforuseinqualitycontrolispossible.Arangeofacceptableresonantfrequenciesisdeterminedforaspecimenwithaparticulargeometryandmass.Anyspecimenwithafrequencyresponsefallingoutsidethisfrequencyrangeisrejected.Theactualmodulusofeachspecimenneednotbedeterminedaslongasthelimitsoftheselectedfrequencyrangeareknowntoincludetheresonantfrequencythatthespecimenmustpossessifitsgeometryandmassarewithinspecifiedtolerances.1.5TherearematerialspecificASTMstandardsthatcoverthedeterminationofresonancefrequenciesandelasticpropertiesofspecificmaterialsbysonicresonanceorbyimpulseexcitationofvibration.TestMethodsC215,C623,C747,C848,C1198,andC1259maydifferfromthistestmethodinseveralareas(forexample;samplesize,d......
【中国标准分类号】:H23
【国际标准分类号】:81_060_20
【页数】:9P.;A4
【正文语种】:英语


【英文标准名称】:OpenDataCommunicationinBuildingAutomation,ControlsandBuildingManagement-ControlNetworkProtocol-Part3:PowerLineChannelSpecification;EnglishversionFprEN14908-3:2012
【原文标准名称】:建筑自动控制和建筑管理的开放式数据通讯.控制网络协议.第3部分:功率线信道规格.英文版本FprEN14908-3-2012
【标准号】:DINEN14908-3-2012
【标准状态】:现行
【国别】:德国
【发布日期】:2012-10
【实施或试行日期】:
【发布单位】:德国标准化学会(DE-DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:空调;自动化;开放系统互连;建筑自动化;建筑物管理;建筑物服务设施;建筑物;电路网络;控制装置;控制系统;数据总线;数据通信;数据交换;数据网络;数据处理;数据传送;定义;EIBNET;加热技术;因特网;KNXNET;网络互连;处理字段总线;协议;规范(验收);系统工程;热环境系统;传输协议
【英文主题词】:Airconditioning;Automation;Automationinstallationsinbuildings;Buildingautomations;Buildingmanagement;Buildingservices;Buildings;Circuitnetworks;Controldevices;Controlsystems;Databus;Datacommunication;Dataexchange;Datanetwork;Dataprocessing;Datatransfer;Definitions;EIBnet;Heatingtechnics;Internet;KNXnet;Networkinterconnection;PROFIBUS;Protocols;Specification(approval);Systemengineering;Thermalenvironmentsystems;Transmissionprotocol
【摘要】:
【中国标准分类号】:L79
【国际标准分类号】:35_240_99;91_140_01;97_120
【页数】:19P;A4
【正文语种】:德语