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Volume 30 Issue 5
May  2014
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Article Navigation >  Explosion And Shock Waves  > 2010  >  30(5): 505-510
TANG Tie-gang, GUI Yu-lin, LI Qing-zhong, CHEN Yong-tao, TONG Hui-feng, LIU Cang-li. Adiscussionofdataprocessingtechniquesforexpandingringtest[J]. Explosion And Shock Waves, 2010, 30(5): 505-510. doi: 10.11883/1001-1455(2010)05-0505-06
Citation: TANG Tie-gang, GUI Yu-lin, LI Qing-zhong, CHEN Yong-tao, TONG Hui-feng, LIU Cang-li. Adiscussionofdataprocessingtechniquesforexpandingringtest[J]. Explosion And Shock Waves, 2010, 30(5): 505-510. doi: 10.11883/1001-1455(2010)05-0505-06
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Adiscussionofdataprocessingtechniquesforexpandingringtest

doi: 10.11883/1001-1455(2010)05-0505-06
  • 1.

    NationalKeyLaboratoryofShock WaveandDetonationPhysics,InstituteofFluidPhysics,

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NationalNaturalScienceFoundationofChina(10872187)

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  • Corresponding author: TANG Tie-gang
  • Publish Date: 2010-09-25
    Abstract
  • Abstract:Themovementofafreelyexpandingringwasanalyzedandtheradialvelocity-timecurveof theexpandingOFHCcopperringwasexperimentallyobtainedbythelaserinterferencetechnique. Thedifferentdatawindowswerechosenfromtheobtainedvelocity-timecurveandtheintercepteddata inthedifferentwindowswerefittedbydifferentmethods.Thentheaccelerationswereacquiredfrom thedifferentialequationsofthevelocities.Thestress-straincurvesweregainedbyprocessingthevelocitiesoftheringunderone- dimensionalstressassumption.Resultsshowthatthereasonableselectionofdatawindowsisthecorrectdata- processingfoundationforexpandingringtests.Whilethe ranksoffittingexpressionsarehigherthan2,theobtainedstress-strainrelationwilllapseformally fromphysicsrules.Butafterthedata,whicharesmoothedbyhigher-rankexpressions,areprocessed bythedirectdifferencemethod,theprocesseddatacanreflectbettertherelationshipbetweenthevelocityhistoryoftheexpandingringanditsinstantaneousstresses. Itexplainsthatthelapseoftheabovefittedstress- strainrelationfromphysicsrulesdoesnotresultfromthedataprocessingmethods butfromtheuncertaintyofthevelocitymeasurementatonepoint.
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