The random packing structures of five types of explosive molding granular samples were investigated using X-ray mi-crotomography to obtain the parameters,including granule spatial arrangement,packing characteristics,and granule contact features.The results show that the random packing system of molding granules exhibits a certain degree of size segregation,with larger granules tending to distribute at the bottom of the container.The filling process affects the horizontal orientation of granule distribution.The average packing efficiency of each sample varies continuously as granular radial distance increases,in-dicating a long-range disorder in the random packing structure of the molding granules.The average contact number of the sam-ples is 5-6,suggesting a random loose packing of spherical granules.However,due to the impact of the radius and morphol-ogies,the volume fraction of granular random packing systems can exceed the limit of random close packing for spherical gran-ules(0.64).The particles formed by the packing system of molding granules in local contact are unevenly distributed in terms of quantity,size,and morphology,but the contact angle around 60° is the most frequent among various contact structures,forming a contact angle distribution with a single characteristic peak around 60°.
维普
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