高濃度短繊維含有粘性流体の単純剪断流れにおける繊維と金型壁面の干渉及び繊維配向分布

概要

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The fiber volume fraction and fiber orientation play an important role in both the rheological analysis of molten polymer and mechanical properties of a finished part in injection molding. Many works have been devoted to the motion of a fiber, rheology of suspension and fiber-fiber interaction for dilute and semi-dilute systems, but less for concentrated suspension, and also, less works to the interaction between fiber and die surface. In this paper, equations are derived to describe the motion of fibers for concentrated suspension basing on the equilibrium of force and torque acted on each fiber in a simple shear flow, where fiber-die surface interaction is numerically analyzed, and fiber-fiber interaction is considered by modifying Tuckers' model. It is found that fiber volume fraction near die surface decreases and fiber orientation distribution along the flow direction is obtained. It results in decrease of viscosity and increase of velocity gradient near die surface.
一般社団法人日本機械学会の論文
1998-05-25