摘要:
改造落锤撞击仪器,在落锤与撞击底座中增加光学系统和压力测试部件,利用高速摄像仪,拍摄了
HMX颗粒炸药受撞击加载过程中微秒量级时间的变形-熔化-点火-燃烧过程图像。研究了下落高度、颗粒松
散程度对变形和点火时间长短及燃烧剧烈程度的影响。结果表明,落锤下落高度越高,塑性扩展持续时间越
短,易发生点火而不易发生喷射现象;较低的落锤下落高度易导致剧烈的喷射,而不易发生点火。颗粒排列越
松散的样品,塑性扩展时间越短,更容易形成多个点火位置,从而使热点聚合导致燃烧的机会越大。
Abstract:
Opticalmeasurementcomponentsweredesignedandmachinedtobeequippedintheconventionaldrop-
weightsystem.Basedontheimproveddrop-weightsystem,theresponseprocessesofdifferent-
massHMXparticlesimpactedbythedifferentfalling-heightweightdropswererecordedbya
high-speedcameraonthemicrosecondtimescale.Theprocessesconsistedofthefollowingphenomena:
explosiveparticledeformation,melting,ignition,combustionandexplosion.Andaseriesofanalysiswerecarriedoutfortheinfluencesofdrop-
weightfallingheightandexplosiveincompactness
degreeonexplosiveparticledeformation,ignitiondurationandcombustionintensity.Investigatedresultsshowthatthehigherthefallingheightofthedropweight,
thelongerthedurationoftheplastic
deformation,theignitionoftheexplosiveinsteadoftheinjectionisapttooccur;thatthelowerfalling
heightofthedropweighttendstoinducetheexplosivetointensivelyjetratherthanbeignited;that
thehighertheincompactnessdegreeoftheexplosive,theshorterthedurationoftheplasticdeformation,
multiplehotspotsareeasiertoformandcoalescewhichleadstohighcombustionprobability.
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