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【英文标准名称】:StandardTestMethodfortheDeterminationofPercentofLet-OffforArcheryBows
【原文标准名称】:测定射箭弓射出百分比的标准试验方法
【标准号】:ASTMF1880-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【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】:F08.16
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:braceheight;drawlength;force-drawcurve;full-draw;let-off;Archeryequipment--specifications;Braceheight;Force-drawcurve;Let-off;Percentoflet-off;Sportsequipment--specifications
【摘要】:Itisrecognizedthatcertaindesignsofthecamsusedinthecompoundingsystemsofarcherybowscausevariationinthepercentoflet-offwithchangeindrawlength,drawweight,orboth.Thisistrueparticularlywiththestyleofcamthatachievesdrawlengthadjustmentbyeffectivelyalteringthelengthoftheshootingstringbyanyofseveralmethods.Inthiscase,themid-drawlengthandthemaximumdrawweightobtainable(butnottoexceedthemaximumratedweightofthebow)shallbeusedtodeterminetheofficialpercentoflet-offforthebowinquestion.Historically,twomethodshavebeeninusetoestablishthepercentoflet-offforarcherybows.Themostcommonmethodusesthepeakdrawforceandtheminimumholdingforcereadfromtheforce-drawcurvetocalculatethepercentoflet-off.Thesecondmethodusesthepeakdrawforcefromtheforce-drawcurveandtheminimumholdingforcefromthelet-downcurveforthiscalculation.Thistestmethoddefinesthetwomethodsanddistinguishesbetweenthem.1.1Thistestmethodcoverstheproceduretobeusedtodeterminethepercentoflet-offforarcherybows.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Y56
【国际标准分类号】:97_220_40
【页数】:3P.;A4
【正文语种】:英语