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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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PURPOSES : In this paper, the packing degrees of binary granular mixtures under vibration compaction were simulated by using DEM with spherical particles to evaluate the applicability of the DEM for aggregate packing degree estimation. METHODS : The packing degrees of fine particles, coarse particles, and their mixture with different fine particle fractions were evaluated in DEM simulation for given various material property conditions. In order to check the validity of estimated packing degrees of particle mixtures, analytical model such as Furnas model that is capable of considering wall effect and loosening effect. RESULTS : DEM with spherical particles showed good agrement with analytical solution in terms of the packing degrees of binary granular mixtures with various fine particle fractions for most of conditions. Also, it was found that not the vibration amplitude but the ratio of particle diameter with vibration amplitude should be considered to explain the susceptibility of particle packing degree with vibration amplitude for the same acceleration condition and that the reduction in elastic modulus to shorten computational simulation time should be carefully considered when the packing degree is the most important concern. CONCLUSIONS :It was concluded that DEM with spherical particles are good enough to estimate the packing degree of binary granular particles for most of conditions. However, the effect of inter-particle frictions between fine and coarse particles have to be studied further in order to clarify the issue relating poor predictions for high inter-particle friction conditions.
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참고문헌 (14)
참고문헌 신청
Aim, R. B. / 1968 / Effect de Paroi dans le Empilements Desordonnes de Spheres et Application a la Porosite de Melanges Benaires / Powder Technology 5:281~290
ASTM. / 2000 / Standard test methods for maximum index density and unit weight of soils using a vibratory table / Designation D4253-00
Chang, P. W. / 1993 / Particle packing of granular soils as affected by vibration / Transaction on the Built Environment 3
Fennis S. / 2011 / Design of Ecological Concrete by Particle Packing Optimization
Fu, G. / 2003 / 3-D Random Packing of Polydisperese Particles and Concrete Aggregate Grading / Powder Technology 133:147~155
ASTM. / 2000 / Standard test methods for maximum index density and unit weight of soils using a vibratory table / Designation D4253-00
Chang, P. W. / 1993 / Particle packing of granular soils as affected by vibration / Transaction on the Built Environment 3
Fennis S. / 2011 / Design of Ecological Concrete by Particle Packing Optimization
Fu, G. / 2003 / 3-D Random Packing of Polydisperese Particles and Concrete Aggregate Grading / Powder Technology 133:147~155
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