钨钛粉末的轴对称爆炸压实  

Axial symmetry explosive compaction of W-Ti powders

作　　者：张晓立[1] 王金相[1] 贾宪振[2] 孙钦密[2] 刘家骢[2] 

机构地区：[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

出　　处：《中国有色金属学报》2008年第8期1527-1533,共7页The Chinese Journal of Nonferrous Metals

基　　金：国防应用基础研究计划资助项目(A2620061131);"十一五"兵器预研支撑基金资助项目(62301110510);南京市科技计划资助项目(200704019)

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。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.

关 键 词：钨钛粉末 爆炸压实 马赫孔 装药比 数值模拟 

分 类 号：TG146.4[一般工业技术—材料科学与工程]