ASTM F2845-2010 棒球和垒球的动态稳定度(DS)和复原圆柱系数(CCOR)测量用标准试验方法

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【英文标准名称】:StandardTestMethodforMeasuringtheDynamicStiffness(DS)andCylindricalCoefficientofRestitution(CCOR)ofBaseballsandSoftballs
【原文标准名称】:棒球和垒球的动态稳定度(DS)和复原圆柱系数(CCOR)测量用标准试验方法
【标准号】:ASTMF2845-2010
【标准状态】:现行
【国别】:
【发布日期】:2010
【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】:F08.26
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:球弹性;球硬度;棒球;复原圆柱系数;动态稳定度;垒球
【英文主题词】:ballelasticity;ballhardness;baseball;cylindricalcoefficientofrestitution;dynamicstiffness;softball
【摘要】:1Theballdynamicstiffnessisameasureofaballx2019;shardness.Itsmeasurementisconductedtorepresentbat-ballimpactforces.Itisnormalizedbytheballweightandspeedtominimizetheinfluenceofmanufacturingandtestvariationsfromthemeasure.Thecylindricalcoefficientofrestitutionisaballpropertyofrelativevelocitychangecausedbyimpactwithacylindricalsurface.Thistestmethodcomparestheperformanceofbaseballsandsoftballsafterimpactwithacylindricaltestsurface.SportsassociationscanuseDSandCCORmeasurementsinspecificationsforofficialbaseballsandsoftballs.1.1Thisproceduredescribesamethodofmeasuringthedynamicstiffness(DS)andcylindricalcoefficientofrestitution(CCOR)ofbaseballsandsoftballsprovidingsimilarimpactforcesandballdeformationasareobservedinabat-ballcollision.1.2Thisprocedureisforaballthatisintendedforthegameofbaseballorsoftball.1.3Thetestmethodisbasedonballspeedmeasurementsbeforeandafterimpactwithacylindricaltestsurfaceandtheimpactforcebetweentheballandimpactedsurface.1.4Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Y55
【国际标准分类号】:97_220_40
【页数】:5P.;A4
【正文语种】: