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基于离散单元法理论,建立纯钨粉末多孔材料等径角挤压的离散元模型,并对其进行单道次变形行为和致密行为的数值模拟和实验,获得了变形中颗粒簇流动过程、速度场、接触力链、致密行为等相关场量变化规律。结果表明,标记颗粒在剪切区的流动过程反映了颗粒簇在剪切力作用下的变形规律;试样头部形状及变形中内转角处的间隙都与内外转角处的速度分布不均有关;经一道次挤压后颗粒间孔隙数量减少,致密度提高,材料性能得到改善。实验结果与模拟结果较为一致,证明了所建模型的可靠性。
Based on the theory of discrete element method, a discrete element model of pure tungsten powder porous material with equal angular misorientation was established. The single-pass deformation behavior and compact behavior of the pure tungsten powder porous material were numerically simulated and experimentally obtained. Field, contact force chain, dense behavior and other related field changes. The results show that the flow of the labeled particles in the shear zone reflects the deformation of the particle clusters under the action of shearing force. The shape of the head and the gap at the inner corner of the deformation are both related to the uneven distribution of velocities at the inner and outer corners ; After a single squeeze reduced the number of pores between the particles, the density increased, the material properties are improved. The experimental results are in good agreement with the simulation results, which proves the reliability of the model.