基本信息
| 标准名称： | 十字槽圆柱头螺钉 |
| 英文名称： | Cross recessed cheese head serews |
| 中标分类： |
机械 >>
通用零部件 >>
紧固件 |
| 替代情况： | 被GB/T 822-2000代替 |
| 发布日期： | 1900-01-01 |
| 实施日期： | 1989-07-01 |
| 首发日期： | 1900-01-01 |
| 作废日期： | 2001-02-01 |
| 出版日期： | 1900-01-01 |
| 页数： | 3页 |
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引用标准
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所属分类： 机械 通用零部件 紧固件
【英文标准名称】:StandardTestMethodforIgnitionSensitivityofMaterialstoGaseousFluidImpact
【原文标准名称】:材料对气流冲击着火敏感度的标准测试方法
【标准号】:ASTMG74-2001
【标准状态】:现行
【国别】:
【发布日期】:2001
【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】:G04.01
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:点火;试验;材料
【英文主题词】:gaseousfluidimpact;ignitionsensitivity;oxygenenrichedenvironment;
【摘要】:Thistestevaluatestherelativesensitivityofmaterialstodynamicpressureimpactsbyvariousgaseousfluidmedia(mayincludemixturesofgases).Anychangeorvariationsintestspecimenconfigurations,thickness,preparation,andcleanlinessmaycauseasignificantchangeinimpactsensitivity/reaction.Areactionisindicatedbyanabruptincreaseintestspecimentemperatureorbyobviouschangesinodor,color,ormaterialappearance,oracombinationthereof,asobservedduringposttestexaminations.Odoraloneisnotconsideredpositiveevidencethatareactionhasoccurred.Suggestedcriteriafortestcompletionatagivenpressureare:4.4.1Eachspecimenissubjectedtofiveimpacts.4.4.2Amaterialpassesifnoreactionsoccurin20successivesamples.4.4.3Amaterialfailsifonereactionoccursinamaximumof20orfewersuccessivesamples.Materialsmayberankedbythemaximumpressure(pressurethreshold)atwhichtheypassthetest.Materialacceptancemaybeonthebasisofpassingataselectedpressure.1.1Thismethoddescribesatechniquetodeterminetherelativesensitivityofmaterialstodynamicpressureimpactsbygasessuchasoxygen,air,orblendsofgasescontainingoxygen.1.2Thismethoddescribesthetestapparatusandtestproceduresthatmaybeemployedintheevaluationofmaterialsforuseingasesunderdynamicpressureoperatingconditionsuptogagepressuresof10000psi(69MPa)atambienttemperature.1.3Thismethodisprimarilyatestforrankingofmaterials.Thismethodisnotnecessarilyvalidfordeterminationofthesensitivityofthematerialsinan"as-used"configurationsincethematerialsensitivitymaybealteredbecauseofchangesinmaterialconfiguration,usage,andenvironment.Thismethodcanbeemployedtoprovidebatch-to-batchacceptancedata.Acceptabilityofanymaterialmaybebasedonitsperformanceataparticulartestpressure,ortestpressuremaybevariedtodeterminethereactionthresholdofamaterial,asspecifiedbytheuser.1.4Thecriteriausedfortheacceptance,retest,andrejectionofmaterialsforanygivenapplicationshallbedeterminedbytheuserandarenotfixedbythismethod.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.ForspecificprecautionsseeSection7.
【中国标准分类号】:C80
【国际标准分类号】:13_220_40;13_230
【页数】:7P.;A4
【正文语种】: