(1. 南京理工大学 瞬态物理国家重点实验室，南京 210094；
2. 南京理工大学 化工学院工程力学系，南京 210094)
摘 要: 对钨钛粉末进行不同装药比的柱状爆炸压实实验，利用光学显微镜得到压实件轴线附近的显微照片；借助于LS-DYNA3D程序对爆炸压实过程进行数值模拟，给出试件中的压力云图、轴线上选定单元的压力时程曲线、中心截面选定节点的径向位移曲线。结合实验和数值模拟的结果分析装药比（E/M）对实验密度的影响及马赫孔的成因。结果表明：利用爆炸压实法可获得高密度(＞98％理论密度)的试件；装药比是影响压实质量的重要参数，随着装药比的增大，试件密度呈增大的趋势，但装药比过大，会在压实件中产生马赫孔，致使压实质量下降。数值模拟预测结果与实验检测结果吻合良好。
关键词: 钨钛粉末；爆炸压实；马赫孔；装药比；数值模拟
（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
