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• W2113598949 abstract "In this thesis, numerical investigation of die filling and powder transfer withindiscrete element method framework is presented. The main focus of the work is toexplore the contribution of die filling and powder transfer processes towards thedensity variation of the powder mass before compaction. The numericalinvestigations are carried out to provide alternative solutions in understanding diefilling and powder transfer mechanisms because of the lack of theoretical andexperimental solutions in the two fields. Validation of the code used was successfullycarried out by comparing simulation results with the existing results of powder flowexperiments conducted in controlled environment which imitate realistic industrialsettings. The effects of shoe kinematics, punch kinematics, contact parameters,modelling parameters, die geometry, die orientation, and shoe volume on die fillingand powder transfer have been identified. It has been confirmed that multiple passes,multiple shoe columns and powder shifting can improve powder packing. The die fillis found to decrease with the increase in friction and cohesion. On the contrary, itincreases with the increase of damping. The combination of slow shoe speed duringfilling and slow punch speed during transfer is found to result in homogeneouspowder packing inside the die. The research has also successfully integrated diefilling and powder transfer in one continuous sequence in a three dimensional setting.Simulation works have also been performed on the Variable Aperture Flowmeter toevaluate the effects of particle composition on critical aperture and angle of repose,and to determine powder flow rate. Investigations were also conducted on thebridging phenomena which conclude that bridging for monodispersed circularparticles stops when the orifice is set at 5.5 particle width. The result however maychange with different values of contact parameters and particle properties. Numericalstudy performed has shown that the discrete element method is capable ofreproducing several key phenomena observed in die filling and powder transferprocesses and to some extent capable of characterising powder flow in a simulatedvariable aperture flowmeter." @default.
• W2113598949 created "2016-06-24" @default.
• W2113598949 creator A5000121472 @default.
• W2113598949 creator A5033263016 @default.
• W2113598949 date "2009-06-01" @default.
• W2113598949 modified "2023-09-26" @default.
• W2113598949 title "Discrete Element Modelling of Particulate Flow in Die Filling and Powder Transfer" @default.
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