MIL-STD-1757A

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MIL-STD-1757A, MILITARY STANDARD: LIGHTNING QUALIFICATION TEST TECHNIQUES FOR AEROSPACE VEHICLES AND HARDWARE (17 JUN 1980) [NO S/S DOCUMENT]., This document presents a set of standard test waveforms and techniques for lighting qualification testing of aerospace vehicles and hardware. The test waveforms presented in this document are intended to reproduce the significant effects of the natural environment and are therefore independent of vehicle type or configuration. The tests include high voltage and high current indirect effects associated with lighting strikes to externally mounted electrical hardware.
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【英文标准名称】:Plaingrinding-wheelswithonerecess
【原文标准名称】:单面凹形的普通砂轮
【标准号】:DIN69125-1977
【标准状态】:作废
【国别】:德国
【发布日期】:1977-07
【实施或试行日期】:
【发布单位】:德国标准化学会(DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:机床;作标记;尺寸;公差;材料;磨料;砂轮
【英文主题词】:marking;materials;dimensions;machinetools;abrasives;grindingwheels;tolerances(measurement)
【摘要】:
【中国标准分类号】:J43
【国际标准分类号】:4365
【页数】:4P;A4
【正文语种】:德语


【英文标准名称】:Plastics-Determinationofthebrittlenesstemperaturebyimpact
【原文标准名称】:塑料.用冲击法测定脆性温度
【标准号】:BSISO974-2000
【标准状态】:现行
【国别】:英国
【发布日期】:2000-05-15
【实施或试行日期】:2000-05-15
【发布单位】:英国标准学会(BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:试验设备;尺寸;环境温度;试样制备;脆性;统计检验;材料的机械性能;塑料;损坏;塑料和橡胶技术;公差(测量);冲击试验;温度
【英文主题词】:
【摘要】:ThisInternationalStandardspecifiesamethodforthedeterminationofthetemperatureatwhichplasticsthatarenotrigidatnormalambienttemperatureexhibitbrittlefailureunderspecifiedimpactconditions.Asupplementarytechniqueusingnotchedspecimensdevelopsbrittlenessvaluesatamuchhighertemperaturethanareobservedforunnotchedspecimensofthesameplasticmaterial.Themethodutilizesastatisticaltechniquetoquantifythebrittlenessfailuretemperature.Provisionsaremadeforthetestingofsufficientspecimenstopermitthecalculationofthebrittlenesstemperatureonastatisticalbasis.Statisticaltechniqueshavebeendevelopedtoquantifythebrittlenesstemperatureasisdefinedin3.1.Themethodestablishesthetemperatureatwhichthereisa50%chanceoffailureineitherunnotchedornotchedspecimens.Thismethodhasbeenfoundusefulforspecificationpurposes,althoughitdoesnotnecessarilymeasurethelowesttemperatureatwhichthematerialmaybeused.Inthemeasurementofthebrittlenesstemperature,theprecisionofthemeasurementshouldpreferablybe±5℃attheworstwhenestablishingvaluesusedinmaterialspecifications.
【中国标准分类号】:G31
【国际标准分类号】:83_080_01
【页数】:16P;A4
【正文语种】:英语