ABSTRACT To investigate the deformation behavior of molding powder and the density evolution of the charge column during the dynamic compaction process, this study established a random packing model considering the particle size distribution of molding powder using the parametric design language of ANSYS APDL. Based on the finite element method (FEM) of continuum mechanics, the particle deformation behavior and density evolution during the dynamic compaction molding process of JH‐15 explosive molding powder were analyzed. The results show that the model effectively simulates the compaction process of the powder. For the pressure‐density curve, the maximum relative error between the experimental and simulated density values under various specific pressures is only 1.869%. Regarding the density distribution of the formed charge, the density near the punch end follows a pattern where the edge density is greater than the center density is greater than the edge density, consistent with relevant research findings. Analysis of the entire compaction process reveals that the particles primarily undergo flow and rearrangement, with elastoplastic deformation occurring during this stage. Larger particles experience both deformation and rotation. The pressure is transmitted from top to bottom, and the pressure decreases from top to bottom; and as the compression progresses, the uniformity of this distribution improves. The model established in this study can be used for the design of process parameters and the estimation of molding density in the compaction molding process of explosive molding powder.
Luo et al. (Sun,) studied this question.
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