A Constitutive Modeling and Experimental Effect of Shock Wave on the Microstructural Sub-strengthening of Granular Copper  

作　　者：A.D.Sharma A.K.Sharma N.Thakur 

机构地区：[1]Department of Physics,Government College Chowari,Chamba,176302,India [2]Om Sterling Global University-Hisar,Haryana,125001,India [3]Department of Physics,Himachal Pradesh University,Shimla,171005,India

出　　处：《Journal of Metallic Material Research》2021年第1期19-25,共7页金属材料研究（英文）

基　　金：Defence Research and Development Organization(DRDO),India,for Grant-in-aid Project No.ERIP/ER/0703665/M/01/1044;the University Grants Commission(UGC-New Delhi),India,for providing Research Fellowship No.F.4-1/2006(BSR)/11-08/2008.

摘　　要：Micro-sized copper powder(99.95%;O≤0.3)has been shock-processed with explosives of high detonation velocities of the order of 7.5 km/s to observe the structural and microstructural sub-strengthening.Axisymmetric shock-consolidation technique has been used to obtain conglomerates of granular Cu.The technique involves the cylindrical compaction system wherein the explosive-charge is in direct proximity with the powder whereas the other uses indirect shock pressure with die-plunger geometry.Numeric simulations have been performed on with Eulerian code dynamics.The simulated results show a good agreement with the experimental observation of detonation parameters like detonation velocity,pressure,particle velocity and shock pressure in the reactive media.A pin contactor method has been utilized to calculate the detonation pressure experimentally.Wide angled x-ray diffraction studies reveal that the crystalline structure(FCC)of the shocked specimen matches with the un-shocked specimen.Field emissive scanning electron microscopic examination of the compacted specimens show a good sub-structural strengthening and complement the theoretical considerations.Laser diffraction based particle size analyzer also points towards the reduced particle size of the shock-processed specimen under high detonation velocities.Micro-hardness tests conducted under variable loads of 0.1 kg,0.05 kg and 0.025 kg force with diamond indenter optical micrographs indicate a high order of micro-hardness of the order of 159 Hv.Nitrogen pycnometry used for the density measurement of the compacts shows that a compacted density of the order of 99.3%theoretical mean density has been achieved.

关 键 词：Shock waves Wide angle x-ray diffraction Microstructure FE-SEM Laser diffraction MICROHARDNESS 

分 类 号：TG1[金属学及工艺—金属学]