Simulation and pore analysis of JH-2 pressing and forming
In order to study the pore distribution and formation reasons of JH-2 pressing process,the Shima-Oyane yield criterion of MSC.Marc software was used to conduct finite element simulation and simulation analysis of the JH-2 pressing process,and the experiment was designed to prepare the powder column and characterize it by microscope,microscopic element determination and CT scan.The results of simulation and characterization show that large granular crystals appear on the lower surface of the powder column,and the pores in the cross-section are mostly concentrated near the axis.The maximum displacement of powder is 9.901 mm,the rebound is 0.99％of the total displacement.The maximum equivalent plastic strain is 0.623 9 and the maximum equivalent elastic strain is 0.042 27.The average relative density of the drug column is 0.970 g/cm3.CT scan showed that the pore cracks were concentrated in the inside of the column.The maximum pore volume was 8.582 5％,the minimum pore volume was 3.531 1％,and the average pore volume was 6.974 5％.The forming quality of the upper part of the charge column near the sleeve is better,and the resultant force is more conducive to powder compaction.The powder near the axis is affected by the unidirectional pressure and the rebound,and the relative density is low.The forming quality of the lower part near the sleeve is poor,and it is easy to produce large particle crystals due to insufficient upper pressure.
PBX pressing processRDXfinite element simulationcolumn defectMSC.MarcCT scan
万方数据
维普
