Adiscussionofdataprocessingtechniquesforexpandingringtest

TANG Tie-gang; GUI Yu-lin; LI Qing-zhong; CHEN Yong-tao; TONG Hui-feng; LIU Cang-li

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

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

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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

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.
- mechanicsofexplosion,
- dataprocessing,
- fittingexpression,
- expandingring,
- difference

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