2011 Vol. 31, No. 5
Display Method:
2011, 31(5): 449-454.
doi: 10.11883/1001-1455(2011)05-0449-06
PDF 
Cited by
Abstract:
Aseriesoftestswereconductedontheeffectsofexplosioninsidethetunnelentrancetoexploretheshockwavepropagationinsidethemultilevelga lerystructuresinthedifferentcasesofthe endsopenorclose.Andtheloadsactingontheprotectivedoorandthesecondaryshockwaveevolvementbehindthedoorwereinvestigated. Themagnituderelationswereobtainedfortheattenuation andvariationofshockwaveoverpressurebetweeneachtwosectionsofthegallery.Thetestresults demonstratethatthemultilevelgallerystructurecannotonlyattenuatethepeakpressureoftheshock wavesignificantly,butitismoreeconomicalthanasinglestraighttunnelwiththesameattenuation degreeofshockwavepressure.
Aseriesoftestswereconductedontheeffectsofexplosioninsidethetunnelentrancetoexploretheshockwavepropagationinsidethemultilevelga lerystructuresinthedifferentcasesofthe endsopenorclose.Andtheloadsactingontheprotectivedoorandthesecondaryshockwaveevolvementbehindthedoorwereinvestigated. Themagnituderelationswereobtainedfortheattenuation andvariationofshockwaveoverpressurebetweeneachtwosectionsofthegallery.Thetestresults demonstratethatthemultilevelgallerystructurecannotonlyattenuatethepeakpressureoftheshock wavesignificantly,butitismoreeconomicalthanasinglestraighttunnelwiththesameattenuation degreeofshockwavepressure.
2011, 31(5): 455-462.
doi: 10.11883/1001-1455(2011)05-0455-08
Abstract:
Thestress-straincurvesofthe304and316Lstainlesssteelslaser-weldedmaterialswereobtainedbyusingtheequalstraintestmethod. Andobvioushardeningbehaviorsduetothetinycrystal oftheweldedmaterialswerenoticed.Thedynamicmechanicalpropertiesofthe304,316Landwelded structurematerialswereexperimentallyinvestigatedbySHTBatelevatedtemperature.Constitutive parametersforthe304and316Lstainlesssteelswerefittedaccordingtodynamicexperimentaldata. ThenumericalsimulationfortheweldedstructurematerialsinSHTBtestwascarriedoutbyLS-DYNAanditwasfoundthatstressinthestructurematerialswasnon- equilibriumattheearlyloading stageduetomaterialimpedancedifference.Thestrainrate-relatedparametersinJohnson-Cookconstitutiveequationsfortheweldedmaterialswereobtainedbycombiningnumericalcalculationandexperimentaldata.
Thestress-straincurvesofthe304and316Lstainlesssteelslaser-weldedmaterialswereobtainedbyusingtheequalstraintestmethod. Andobvioushardeningbehaviorsduetothetinycrystal oftheweldedmaterialswerenoticed.Thedynamicmechanicalpropertiesofthe304,316Landwelded structurematerialswereexperimentallyinvestigatedbySHTBatelevatedtemperature.Constitutive parametersforthe304and316Lstainlesssteelswerefittedaccordingtodynamicexperimentaldata. ThenumericalsimulationfortheweldedstructurematerialsinSHTBtestwascarriedoutbyLS-DYNAanditwasfoundthatstressinthestructurematerialswasnon- equilibriumattheearlyloading stageduetomaterialimpedancedifference.Thestrainrate-relatedparametersinJohnson-Cookconstitutiveequationsfortheweldedmaterialswereobtainedbycombiningnumericalcalculationandexperimentaldata.
2011, 31(5): 463-468.
doi: 10.11883/1001-1455(2011)05-0463-06
Abstract:
Aseriesofexperimentandsimulationwerecarriedouttoexplorethepeakpressuredistributioninthenearfieldofthecylindricalchargeunderwat rexplosioninthetwocasesofnine-pointoffcenterdetonationandcentraldetonation. Theshockwavepeakpressuresintheabovetwocaseswere obtainedatthetestedpointswiththedistancesandangles.Andthedirectedpeakpressuregainfield wasacquiredinthecaseofnine-pointoff-centerdetonation.Theresultsshowthatintherangeof750 mmandtheangleof0~90ofunderwaterexplosionfieldforthefive-kilogram UHL-5charge,the shockwavepeakpressurebynine-pointoff-centerdetonationishigherthanbycentraldetonation.
Aseriesofexperimentandsimulationwerecarriedouttoexplorethepeakpressuredistributioninthenearfieldofthecylindricalchargeunderwat rexplosioninthetwocasesofnine-pointoffcenterdetonationandcentraldetonation. Theshockwavepeakpressuresintheabovetwocaseswere obtainedatthetestedpointswiththedistancesandangles.Andthedirectedpeakpressuregainfield wasacquiredinthecaseofnine-pointoff-centerdetonation.Theresultsshowthatintherangeof750 mmandtheangleof0~90ofunderwaterexplosionfieldforthefive-kilogram UHL-5charge,the shockwavepeakpressurebynine-pointoff-centerdetonationishigherthanbycentraldetonation.
2011, 31(5): 469-474.
doi: 10.11883/1001-1455(2011)05-0469-06
Abstract:
Tounderstandandimprovethecrashworthinessofflexiblecontainers,thedynamicbehaviorsofthecontainerunderimpactloadingwerenumericallysimulated. ThewatermovementandsloshinginthecontainerweremodeledbyusingtheALEmethod. Theinteractionbetweenthecontainer andfluidwasstudiedbyapplyingthepenaltymethod.Themodelandapproacheswerevalidatedby comparingnumericalresultswithexperimentaldata.Basedontheaboveinvestigation,numericalsimulationwasperformedtoexploretheinfluencesofdropheightandwaterquantityonthedynamicresponseofthecontainer. Andthedeformationandstressdistributionatthekeypositionswereanalyzed. Resultsdisplaythattheshoulderofthecontaineristhemostvulnerablepartduringimpact; thatbothdropheightandwaterquantityhavegreateffectsonthecrashworthinessofthecontainer; thatthemaximumdynamicstressofthecontainerisproportionaltodropheightandthereliesaVshapedrelationbetweenthemaximumdynamicstressa dwaterquantity.
Tounderstandandimprovethecrashworthinessofflexiblecontainers,thedynamicbehaviorsofthecontainerunderimpactloadingwerenumericallysimulated. ThewatermovementandsloshinginthecontainerweremodeledbyusingtheALEmethod. Theinteractionbetweenthecontainer andfluidwasstudiedbyapplyingthepenaltymethod.Themodelandapproacheswerevalidatedby comparingnumericalresultswithexperimentaldata.Basedontheaboveinvestigation,numericalsimulationwasperformedtoexploretheinfluencesofdropheightandwaterquantityonthedynamicresponseofthecontainer. Andthedeformationandstressdistributionatthekeypositionswereanalyzed. Resultsdisplaythattheshoulderofthecontaineristhemostvulnerablepartduringimpact; thatbothdropheightandwaterquantityhavegreateffectsonthecrashworthinessofthecontainer; thatthemaximumdynamicstressofthecontainerisproportionaltodropheightandthereliesaVshapedrelationbetweenthemaximumdynamicstressa dwaterquantity.
2011, 31(5): 475-480.
doi: 10.11883/1001-1455(2011)05-0475-06
Abstract:
Basedonthelimitequilibrium methodforrigidblockandtheequivalentaccelerationmethod, accordingtotheattenuationprincipleofthepeakblastingvibrationvelocityandthetimehistory ofthevelocity,thetime-historycurveofthedynamicstabilitysafetyfactoroftheslopeunderblastingvibrationwasobtainedbyanalyzingthewholeblastingvibrationpr cessatacertaintimestep.Analysisindicatesthatfortheslopeswithbetterstability, thesafetyfactorisgenerallyreducedby2% to4% underblastingvibration,andthehigherthemainfrequencyis,thegreaterthestabilitysafety factoris.Whiletheregularreductionmethodmayenlargetheblastingvibrationharmfulnesstothe slopestability.
Basedonthelimitequilibrium methodforrigidblockandtheequivalentaccelerationmethod, accordingtotheattenuationprincipleofthepeakblastingvibrationvelocityandthetimehistory ofthevelocity,thetime-historycurveofthedynamicstabilitysafetyfactoroftheslopeunderblastingvibrationwasobtainedbyanalyzingthewholeblastingvibrationpr cessatacertaintimestep.Analysisindicatesthatfortheslopeswithbetterstability, thesafetyfactorisgenerallyreducedby2% to4% underblastingvibration,andthehigherthemainfrequencyis,thegreaterthestabilitysafety factoris.Whiletheregularreductionmethodmayenlargetheblastingvibrationharmfulnesstothe slopestability.
2011, 31(5): 481-489.
doi: 10.11883/1001-1455(2011)05-0481-09
Abstract:
Aimedatnormalandobliquepenetrationintosemi-infiniteconcrete/limestonetargetsbya high-speedprojectile,anaxisdragforcewasemployedtoreflectthecontinuousvariationofthenose shape.Withconsideringthetransverseloadinthecasesofasymmetricalmassabrasionandoblique penetration,amethodwasproposedtoanalyzetheyieldofanormally/obliqulypenetratingprojectile. Theinitialimpactvelocitylimitwasdeducedbytakingtheprojectilestabilityintoaccountwhenthe cartridgethicknesswasgiven,andtheinfluencesofdifferentprojectile/targetconditionswerediscussed.
Aimedatnormalandobliquepenetrationintosemi-infiniteconcrete/limestonetargetsbya high-speedprojectile,anaxisdragforcewasemployedtoreflectthecontinuousvariationofthenose shape.Withconsideringthetransverseloadinthecasesofasymmetricalmassabrasionandoblique penetration,amethodwasproposedtoanalyzetheyieldofanormally/obliqulypenetratingprojectile. Theinitialimpactvelocitylimitwasdeducedbytakingtheprojectilestabilityintoaccountwhenthe cartridgethicknesswasgiven,andtheinfluencesofdifferentprojectile/targetconditionswerediscussed.
2011, 31(5): 490-496.
doi: 10.11883/1001-1455(2011)05-0490-07
Abstract:
Basedonthemodeofductileholeexpansion,theChen-and-LimodelandForrestal-and-Warrenmodelwereanalyzedforarigidsharp- nosedprojectileperforatingductilemetallictargetplates.Analysisshowsthatthesetwomodelshavethesameformula, buttheirapplicablerangesaredifferent whichisduetotheiremployingthecylindricalcavityexpansiontheoryandsphericalcavityexpansion theory,respectively.Andthesetwomodelswerecomparedwiththeexperimentalresultsfromthe perforationofaluminumplatesbyrigidsharp-nosedprojectiles.Thetheoreticalresultsbythesetwo modelsareinagreementwiththeexperimentalresults.
Basedonthemodeofductileholeexpansion,theChen-and-LimodelandForrestal-and-Warrenmodelwereanalyzedforarigidsharp- nosedprojectileperforatingductilemetallictargetplates.Analysisshowsthatthesetwomodelshavethesameformula, buttheirapplicablerangesaredifferent whichisduetotheiremployingthecylindricalcavityexpansiontheoryandsphericalcavityexpansion theory,respectively.Andthesetwomodelswerecomparedwiththeexperimentalresultsfromthe perforationofaluminumplatesbyrigidsharp-nosedprojectiles.Thetheoreticalresultsbythesetwo modelsareinagreementwiththeexperimentalresults.
2011, 31(5): 497-503.
doi: 10.11883/1001-1455(2011)05-0497-07
Abstract:
A14.5-mmslipchambergunwasusedtoshootthesphericalsteelprojectilewiththediameterof6mmtopenetrateintosteel- aluminumorsteel-aluminum-steelexplosively-weldedplates.The LS-DYNA3Dsoftwarewasappliedtosimulatethesepenetrationprocesses,andthetie-breakmodel wasusedtodescribetheinterfacesbetweentheexplosively-weldedlayers.Theeffectsofthedifferent combinationsoftheexplosively-weldedplatesontheanti-penetrationperformancesandthedamage mechanism wereanalyzed.Theresultsshowthatwhenthetotalthicknessoftheplateisconstant,the anti-penetrationperformanceofthethree-layerplateisbetterthanthatofthetwo-layerplate.Forthe two-layerplate,theoptimizedthicknessratioofthetwolayersisabout2∶1.Atthisratio,thetwolayerplate, ofwhichthefrontlayerissteel,therearlayerisaluminum,hasthebestanti-penetration performance.Thedamagemechanismofthefrontlayerisshearingandtucking.Thedamagemechanismoftherearlayerisprolongingdeformation( whenitisaluminum)andpetaldeformation(when itissteel).Andthesimulatedresultsareingoodagreementwiththeexperimentalones,sothetiebreakmodelcanreflecttheeffectoftheinterlayercombinationonanti- penetrationperformances.
A14.5-mmslipchambergunwasusedtoshootthesphericalsteelprojectilewiththediameterof6mmtopenetrateintosteel- aluminumorsteel-aluminum-steelexplosively-weldedplates.The LS-DYNA3Dsoftwarewasappliedtosimulatethesepenetrationprocesses,andthetie-breakmodel wasusedtodescribetheinterfacesbetweentheexplosively-weldedlayers.Theeffectsofthedifferent combinationsoftheexplosively-weldedplatesontheanti-penetrationperformancesandthedamage mechanism wereanalyzed.Theresultsshowthatwhenthetotalthicknessoftheplateisconstant,the anti-penetrationperformanceofthethree-layerplateisbetterthanthatofthetwo-layerplate.Forthe two-layerplate,theoptimizedthicknessratioofthetwolayersisabout2∶1.Atthisratio,thetwolayerplate, ofwhichthefrontlayerissteel,therearlayerisaluminum,hasthebestanti-penetration performance.Thedamagemechanismofthefrontlayerisshearingandtucking.Thedamagemechanismoftherearlayerisprolongingdeformation( whenitisaluminum)andpetaldeformation(when itissteel).Andthesimulatedresultsareingoodagreementwiththeexperimentalones,sothetiebreakmodelcanreflecttheeffectoftheinterlayercombinationonanti- penetrationperformances.
2011, 31(5): 504-509.
doi: 10.11883/1001-1455(2011)05-0504-06
Abstract:
StaticanddynamicmechanicalpropertiesofAISI304andAISI316Ldissimilarstainlesssteel laserweldedjointswereexperimentallystudiedbyMTSandanimprovedSHTBdevice.AnewSHTB clampingmethodfortheweldedstructurewasestablished.Thedynamicstrain-stresscurveswereobtainedatthestrainratearound103s- 1andtemperature25-500 ℃.Resultsshowthatyieldstrength andtensilestrengthoftheweldedstructureincreasewiththeincreaseofstrainrateanddecreaswith theincreaseoftemperature.Temperaturehasmoresignificanteffectontheplasticflowstressthan strainrate.
StaticanddynamicmechanicalpropertiesofAISI304andAISI316Ldissimilarstainlesssteel laserweldedjointswereexperimentallystudiedbyMTSandanimprovedSHTBdevice.AnewSHTB clampingmethodfortheweldedstructurewasestablished.Thedynamicstrain-stresscurveswereobtainedatthestrainratearound103s- 1andtemperature25-500 ℃.Resultsshowthatyieldstrength andtensilestrengthoftheweldedstructureincreasewiththeincreaseofstrainrateanddecreaswith theincreaseoftemperature.Temperaturehasmoresignificanteffectontheplasticflowstressthan strainrate.
2011, 31(5): 510-515.
doi: 10.11883/1001-1455(2011)05-0510-06
Abstract:
Anexperimentonthegasoline-airmixturesecondarythermalignitionwasoperatedunder theconditionsthattheresidualgasformedafterthefirstthermalignitionextinguishedencountered thelocalhotsourceagain.Accordingtoexperimentalresults,thecriticalignitiontemperature,the criticalconcentration,thechangerulesoftheignitionprobability,theignitionintensityandignition mannerswerediscussedindetail.Comparedwiththefirstthermalignition,thesecondarythermalignitionofthegasoline- airmixtureiseasier,theignitionintensityisstronger,andthetimeoffireis longer.Thegeneralcriterionofthesecondarythermalignitionofgasoline-airmixturewassummarized. Therelationbetweentheambienttemperatureandtheignitionprobabilitycanbeexpressedby theequation =aeb cT+d .
Anexperimentonthegasoline-airmixturesecondarythermalignitionwasoperatedunder theconditionsthattheresidualgasformedafterthefirstthermalignitionextinguishedencountered thelocalhotsourceagain.Accordingtoexperimentalresults,thecriticalignitiontemperature,the criticalconcentration,thechangerulesoftheignitionprobability,theignitionintensityandignition mannerswerediscussedindetail.Comparedwiththefirstthermalignition,thesecondarythermalignitionofthegasoline- airmixtureiseasier,theignitionintensityisstronger,andthetimeoffireis longer.Thegeneralcriterionofthesecondarythermalignitionofgasoline-airmixturewassummarized. Therelationbetweentheambienttemperatureandtheignitionprobabilitycanbeexpressedby theequation =aeb cT+d .
2011, 31(5): 516-520.
doi: 10.11883/1001-1455(2011)05-0516-05
Abstract:
Athree-dimensionalcomputationmodelwithactualsizeswasdevelopedbychoosingtherecoilbrakeofacertaingunastheresearchobject. Dynamicmeshesandslidingmeshestechniqueswere usedtonumericallycalculatethethree-dimensionalflowfieldinsidetherecoilbrakeattheactualrecoilingvelocityofthegun. Thepressuresofthedifferentchambersintherecoilbrakewerecalculated byusingthestandardk- model,theRNGk- modelandtherealizablek- model,respectively.And thecalculatedpressureswerecomparedwiththeexperimentalresults.Comparisonsshowthatthe pressurescalculatedbythestandardk- modelareinthebestagreementwiththeexperimentalresults.
Athree-dimensionalcomputationmodelwithactualsizeswasdevelopedbychoosingtherecoilbrakeofacertaingunastheresearchobject. Dynamicmeshesandslidingmeshestechniqueswere usedtonumericallycalculatethethree-dimensionalflowfieldinsidetherecoilbrakeattheactualrecoilingvelocityofthegun. Thepressuresofthedifferentchambersintherecoilbrakewerecalculated byusingthestandardk- model,theRNGk- modelandtherealizablek- model,respectively.And thecalculatedpressureswerecomparedwiththeexperimentalresults.Comparisonsshowthatthe pressurescalculatedbythestandardk- modelareinthebestagreementwiththeexperimentalresults.
2011, 31(5): 521-527.
doi: 10.11883/1001-1455(2011)05-0521-07
Abstract:
Standing,sitting,walkinghumanlumpedparametermodelsweredevelopedtoexplorethe crewresponseunderunderwaterexplosion.Therelationbetweenthehumanimpactdamageandunderwaterexplosionshockstrengthwasanalyzed. Andthedamageundergonebythecrewwasevaluatedbasedonthecommonstandardstoprovideguidanceforthecrewprotectionofsurfaceships.
Standing,sitting,walkinghumanlumpedparametermodelsweredevelopedtoexplorethe crewresponseunderunderwaterexplosion.Therelationbetweenthehumanimpactdamageandunderwaterexplosionshockstrengthwasanalyzed. Andthedamageundergonebythecrewwasevaluatedbasedonthecommonstandardstoprovideguidanceforthecrewprotectionofsurfaceships.
2011, 31(5): 528-562.
doi: 10.11883/1001-1455(2011)05-0528-05
Abstract:
TheexplosionfireballsdescriptiveparametersofathermobaricexplosiveandTNT were measuredbyaninfraredimager.Accordingtotheexperimentdata,adynamicmodeloffireballthermalradiationwasstudied, andthechangeofthefireballssizeandpositionwasquantitativelydescribed. Basedonthedynamicmodel,thethermaldamagesofthethermobaricexplosiveandTNT fireballswereanalyzed.Theresultsshowthatthethermaldoseofthethermobaricexplosiveis3.6- 4.8timesasmuchasthatofTNT,whichindicatesthatthethermobaricexplosivehasadvantagesin thethermaldamageeffect.Comparedwithastaticmodel,thedynamicmodelismorereasonableto estimatethethermaleffectofexplosive-fireball,sinceitcandescribethemovementoffireball
TheexplosionfireballsdescriptiveparametersofathermobaricexplosiveandTNT were measuredbyaninfraredimager.Accordingtotheexperimentdata,adynamicmodeloffireballthermalradiationwasstudied, andthechangeofthefireballssizeandpositionwasquantitativelydescribed. Basedonthedynamicmodel,thethermaldamagesofthethermobaricexplosiveandTNT fireballswereanalyzed.Theresultsshowthatthethermaldoseofthethermobaricexplosiveis3.6- 4.8timesasmuchasthatofTNT,whichindicatesthatthethermobaricexplosivehasadvantagesin thethermaldamageeffect.Comparedwithastaticmodel,thedynamicmodelismorereasonableto estimatethethermaleffectofexplosive-fireball,sinceitcandescribethemovementoffireball
2011, 31(5): 533-569.
doi: 10.11883/1001-1455(2011)05-0533-07
Abstract:
Along-rodprojectilepenetratinglayeredmetaltargetswasnumericalsimulatedbyusing AutodynprogrambasedonthemeshfreeSPH method.Theresidualvelocityandkineticenergyafter theprojectilepenetratingintothefirsttargetwereanalyzed,andthefragmentswereobtained.The effectofdifferentinitialvelocityormassonpenetrationwasdiscussed.Thesimulatedresultswere comparedwiththeexperimentalones.Itisshownthatthesimulatedresultsarereasonableandthey canexactlyreflectthepenetrationprocessofalong-rodprojectileintoalayedtarget.
Along-rodprojectilepenetratinglayeredmetaltargetswasnumericalsimulatedbyusing AutodynprogrambasedonthemeshfreeSPH method.Theresidualvelocityandkineticenergyafter theprojectilepenetratingintothefirsttargetwereanalyzed,andthefragmentswereobtained.The effectofdifferentinitialvelocityormassonpenetrationwasdiscussed.Thesimulatedresultswere comparedwiththeexperimentalones.Itisshownthatthesimulatedresultsarereasonableandthey canexactlyreflectthepenetrationprocessofalong-rodprojectileintoalayedtarget.
2011, 31(5): 540-547.
doi: 10.11883/1001-1455(2011)05-0540-08
Abstract:
Dynamiccompressiveandtensileexperimentswereconductedforthesteel-fiberreinforced reactivepowderconcrete(RPC)byusinga74-mm-diameterSHPBsetup.Thedynamicmechanical parameterswereobtainedforthesteel-fiberreinforcedRPCatthedifferentstrainratesof1~102s-1. Thedynamicstressdistributioninthespecimenwasnumericallysimulatedtovalidatethedynamic tensileexperiments.Investigatedresultsrevealthatboththedynamiccompressiveandtensilemechanicalpropertiestakeonobviousstrain- rateeffects.Withtheincreaseofstrainrate,thefollowing parametersallincreasetoacertainextent,whichincludethedynamiccompressivestrength,strain andelasticmodulus;andthedynamicsplittingtensilestrength.Andtheratioofdynamictensileto compressivestrengthhasanobservableincreasecomparedwiththeratioofstatictensiletocompressivestrength.
Dynamiccompressiveandtensileexperimentswereconductedforthesteel-fiberreinforced reactivepowderconcrete(RPC)byusinga74-mm-diameterSHPBsetup.Thedynamicmechanical parameterswereobtainedforthesteel-fiberreinforcedRPCatthedifferentstrainratesof1~102s-1. Thedynamicstressdistributioninthespecimenwasnumericallysimulatedtovalidatethedynamic tensileexperiments.Investigatedresultsrevealthatboththedynamiccompressiveandtensilemechanicalpropertiestakeonobviousstrain- rateeffects.Withtheincreaseofstrainrate,thefollowing parametersallincreasetoacertainextent,whichincludethedynamiccompressivestrength,strain andelasticmodulus;andthedynamicsplittingtensilestrength.Andtheratioofdynamictensileto compressivestrengthhasanobservableincreasecomparedwiththeratioofstatictensiletocompressivestrength.
2011, 31(5): 548-552.
doi: 10.11883/1001-1455(2011)05-0548-05
Abstract:
Fromthedetonationenergyreleaseform ofexplosiveinrock mass,theblastvibration causedbytwodifferentexplosiveswasanalyzedbycombiningthesitemonitoringresults.Andthe twofactorswereregressivelydiscussed:theattenuationofthepeakparticlevibrationvelocitywiththe distanceawayfromtheblastsource;thevibrationdurationcausedbythesetwoexplosives.Theresultsshowthatapartfromtheexplosiveamountperdelayandthedistancefromtheblastsource, the differentpropertiesofexplosiveshaveremarkableinfluencesontheblastvibrationattenuationandthe vibrationduration.
Fromthedetonationenergyreleaseform ofexplosiveinrock mass,theblastvibration causedbytwodifferentexplosiveswasanalyzedbycombiningthesitemonitoringresults.Andthe twofactorswereregressivelydiscussed:theattenuationofthepeakparticlevibrationvelocitywiththe distanceawayfromtheblastsource;thevibrationdurationcausedbythesetwoexplosives.Theresultsshowthatapartfromtheexplosiveamountperdelayandthedistancefromtheblastsource, the differentpropertiesofexplosiveshaveremarkableinfluencesontheblastvibrationattenuationandthe vibrationduration.
2011, 31(5): 553-556.
doi: 10.11883/1001-1455(2011)05-0553-04
Abstract:
Anew modelwasproposedbycombiningtheJTFreaction-ratemodelandslowenergy-releasefunctiontonumericallysimulatethedetonationprocessofinsensitivehighexplosive (IHE). Andcomparisonsbetweentheoreticalandexperimentalresultsshowthatthismodelcandescribemore factuallytheIHEdetonationprocess.
Anew modelwasproposedbycombiningtheJTFreaction-ratemodelandslowenergy-releasefunctiontonumericallysimulatethedetonationprocessofinsensitivehighexplosive (IHE). Andcomparisonsbetweentheoreticalandexperimentalresultsshowthatthismodelcandescribemore factuallytheIHEdetonationprocess.
2011, 31(5): 557-560.
doi: 10.11883/1001-1455(2011)05-0557-04
Abstract:
1Cr13Mo/45steelcladconticasterrollerswerepreparedbyusinganexplosivecaldmethod toexploretheexplosivecladtechnique,andtheultrasonicscantestandmetallographwereusedtoresearchtheeffectoftheexplosivethicknessandstand- offonthecladrollers.Investigatedresultsshow thatthestand-offhasobservableeffectontheinterfacewavewhentheexplosivethicknessisfixed, butwhenthestand-offisfixed,theexplosivethicknesshaslittleeffectontheinterfacewave.Finally, abetterexplosiveprocesswasexperimentallyobtainedtomanufacture1Cr13Mo/45steelcladrollers.
1Cr13Mo/45steelcladconticasterrollerswerepreparedbyusinganexplosivecaldmethod toexploretheexplosivecladtechnique,andtheultrasonicscantestandmetallographwereusedtoresearchtheeffectoftheexplosivethicknessandstand- offonthecladrollers.Investigatedresultsshow thatthestand-offhasobservableeffectontheinterfacewavewhentheexplosivethicknessisfixed, butwhenthestand-offisfixed,theexplosivethicknesshaslittleeffectontheinterfacewave.Finally, abetterexplosiveprocesswasexperimentallyobtainedtomanufacture1Cr13Mo/45steelcladrollers.
