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8 9 6                                                      FANG Kuang,CHEN Qingchou,FU Qiubo,WANG Yao

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         suretransition,theflyerposewouldgetworseasbarrellength  arerespectively4273m· s and3164m· s .Inaddition,
         extends.Theflyermightinclineastheflightdistanceextended,  asitexhibitedinFig.11b,inthefirst0.2mm,theflyerveloc
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                                                                                                           #
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         whichwouldcausealargercontactangleandsmallerinterfaceof  itycouldreachto3791m·s (1),and2793m·s (2),
         impact,andconsequentlyenlargetheinitiationenergybecauseof  thevelocityofflyer25 μ m is36% higherthanthatofflyer
         diametereffect.Inadditiontheablationofhotplasmawillin  40μ m,whileattheimpactpoint0.4mm,theincrementde
         creasesynchronallyasbarrellengthincreasefrom 0.2 mm to  creaseto30%.
         0.4mm,whichwillleadstothecrippleofflyer′simpactdura    Thephenomenarevealthatthethickerflyerlackstheabil
         tion,andmeanwhileenlargetheinitiationenergy.Althoughthe  ityoffastaccelerationandtherebyneedsalongerbarreltoob
         flyervelocityat0.4mm ishigherthantheoneat0.2mm,the   tainahighervelocityrelatively.Forthethinflyer,thevelocity
         combinationoftheotheradversefactorsmayleadtotheincreas  isabletoreachthemaximum inashortdistance.Whilecon
                               [9]
         ingofmeanthresholdvoltage .Theinfluencingproportionof  sideringtheablationofhotplasma,alongerbarreldoesn′t
         thoseingredientsneedsmoreprofoundresearch.           necessarilyguaranteebetterflyeracceleration.

         4.4 InfluencesofFlyerThickness                      4.5 TheFiringTestofHNS Ⅳ
           Theeffectofflyerthicknessontheflyeraccelerationhas    Forthedetonationcapabilityevaluation,theintegratedEFI
         alsobeeninvestigatedbythePDVdiagnosticsystem.Thetest  wasassembledwiththeHNS Ⅳ,asillustratedinFig.12.The
         samplesweresetwithdifferentflyerthicknessbuttheotherpa  firingconditionwaslistedinTable5.Thedimensionofthepel
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         rametersareidenticalaslistedinTable4.                letis Φ 4mm×4mm,thedensityis1.58g·cm .Thefunction
                                                  #
           AsitillustratedinFig.11a,theflyerofsample1 acceler  timewasdetectedbytheprobeattachedtotheexplosive.
                                #
         atesmuchfasterthanthatof2,themaximum offlyervelocity
                                                              Table5 ThefiringconditionforthedetonationofHNS Ⅳ
         Table4 ThesampleparametersofEFIflyerthicknesstest           voltage   barrel   flyer      functiontime
                                                              sample
               foil     barrel         flyer                         /V        material  material   / μ s
                               barrel           flyer          #
         sample thickness  length      thickness              1      2700      Su8      ParyleneC  1.00
                               material         material
               / μ m     /mm           / μ m                  2 #    2700      Su8      ParyleneC  1.06
         1 #   4        0.4    Su8     25       paryleneC    3 #    2100      Su8      ParyleneC  -
         2 #   4        0.4    Su8     40       paryleneC















                                                              Fig.12 FiringtestofintegratedEFI
                  a.timevelocityprofileofflyeracceleration
                                                                Aslistedintable5,theintegratedEFIcouldsuccessfully
                                                              detonatetheHNS Ⅳ withafiringvoltageabove2700V,the
                                                              functiontimeisaround1.00μ s,whichis0.1μ shigherthan
                                                              thatoftheconventionalEFIwithapolyimideflyer,thereason
                                                              forthisphenomenon,mightduetosubstratebondingforcedi
                                                              vergence caused by the different fabrication process of
                                                              paryleneCandpolyimideflyer,whiletheprofounderexplana
                                                              tionneedfurtherresearch.


                                                             5 Conclusions
                b.timedisplacementprofileofflyeracceleration
                                                                Inthepresentwork,weproposedthefabricationprocessof
         Fig.11 FlyervelocitydiagnosticofEFIassembledwithdifferentflyer
         thickness                                            anintegratedEFIwhichwaseffectiveforthedetonationofHNS


         ChineseJournalofEnergeticMaterials,Vol.24,No.9,2016(892-897)  !"#$            www.energeticmaterials.org.cn
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