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Modeling of Adhesive Particles Using a Combination of the Two-Body Interaction and Phase-Field Methods

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Document pages: 13 pages

Abstract: Discrete materials such as powders and granularmaterials have been widelyused due to their specific characteristics. The precise evaluation isaccordingly becoming important, and various numerical schemes have beendeveloped. However, the interactions among the constituent particles are stilldifficult to model precisely. Especially, contact conditions, which vary withmaterial properties and circumstances, are difficult to formulate. In thisstudy, a computationalmodel for simulating adhesive particles on contact in a many-particle system is proposed.The interaction between the particles was represented by a two-body repulsive force that depends on thedistance between particles and an additional adhesive force at the contactpoint. A phase-field variable was introduced to express the surface of eachparticle, and the adhesive force was formulated using the phase-fielddistribution. As a result, the adhesion of particles was properly expressed. For amono-particle system, neighboring particles adhered and uniformly aggregated,while for a dual-particle system, several characteristic patterns were obtaineddepending on the initial arrangement of the particles. Repulsive contact wasalso considered as a specific case, and the corresponding results were obtained.

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