침상형 입자의 동적 거동 해석을 위한 강체 막대형 이산요소법 모델 개발

Numerous studies of the dynamic behavior of powders have been performed by Discrete Element Method(DEM). The behavior of powders can be analyzed using the DEM assuming that the powder is composed ofspherical particles. Moreover, the assumption of spherical particle reduces the computing time significantly. However, the biggest problem with this assumption is the real shape of the particles. Some types of particles,such as calcium carbonate and colloidal copper, are needle shaped. Thus, analysis based on spherical particlescan produce errors because of the incorrect assumption. In this research, we developed a new model tosimulate needle-shaped particles using the DEM. In the model, a series of particles are connected andregarded as a rod. There is no relative motion among the particles. Thus, the behavior of the rod is rigidmotion. To validate the developed model, we carried out the drop-and-bounce test with different initial angles. The results showed negligible error of less than 2%.