(1. 南京理工大學(xué) 瞬態(tài)物理國家重點(diǎn)實(shí)驗(yàn)室，南京 210094；
2. 南京理工大學(xué) 化工學(xué)院工程力學(xué)系，南京 210094)
摘 要: 對(duì)鎢鈦粉末進(jìn)行不同裝藥比的柱狀爆炸壓實(shí)實(shí)驗(yàn)，利用光學(xué)顯微鏡得到壓實(shí)件軸線附近的顯微照片；借助于LS-DYNA3D程序?qū)Ρ▔簩?shí)過程進(jìn)行數(shù)值模擬，給出試件中的壓力云圖、軸線上選定單元的壓力時(shí)程曲線、中心截面選定節(jié)點(diǎn)的徑向位移曲線。結(jié)合實(shí)驗(yàn)和數(shù)值模擬的結(jié)果分析裝藥比（E/M）對(duì)實(shí)驗(yàn)密度的影響及馬赫孔的成因。結(jié)果表明：利用爆炸壓實(shí)法可獲得高密度(＞98％理論密度)的試件；裝藥比是影響壓實(shí)質(zhì)量的重要參數(shù)，隨著裝藥比的增大，試件密度呈增大的趨勢，但裝藥比過大，會(huì)在壓實(shí)件中產(chǎn)生馬赫孔，致使壓實(shí)質(zhì)量下降。數(shù)值模擬預(yù)測結(jié)果與實(shí)驗(yàn)檢測結(jié)果吻合良好。
關(guān)鍵字: 鎢鈦粉末；爆炸壓實(shí)；馬赫孔；裝藥比；數(shù)值模擬
（1.State Key Laboratory of Transient Physics, NUST, Nanjing 210094, China;
2. Engineering Mechanics Department of Institute of Chemical Technology, NUST, Nanjing 210094, China）
Abstract:Axial symmetry explosive compaction was investigated for W-Ti powders at different mass ratios of explosive to mixed powders (E/M). The micrographs near the axis of the specimens were taken by the light microscope. Numerical simulation of explosive compaction was carried out to recur LS-DYNA3D program. Pressure cloud pictures of the set-up for explosive compaction, pressure time-history curve of the certain elements of the axis of the sample and the radial displacement of the certain nodes of the center cut of it were protracted. Influences of E/M on specimen density and the formation of mach-hole were analyzed. The results show that the specimens with high density over 98% (T. D) can be obtained by explosive compaction of powders. E/M is an important parameter that affects the specimen quality. With increasing E/M, the density of the specimens increases firstly, and then the mach-hole appears that debases the compact quality. The prediction results of numerical simulation show a good agreement with the experimental measurements.
Key words: tungsten-titanium powders; explosive compaction; mach-hole; mass ratio of explosive to mixed powders; numerical simulation
