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고무복합체의 모세관 압출에서 비선형 점탄성 모델과 간략화된 점탄성 모델의 비교
김지현(J.H. Kim),최성현(S.H. Choi),김학주(H.J. Kim),류민영(M.Y. Lyu) 한국소성가공학회 2010 금형가공 심포지엄 Vol.2010 No.11
Rubber compounds have high viscoelastic property. One of the viscoelastic behaviors during profile extrusion is the swelling of extrudate. In this study, die swells of rubber compounds at the capillary die have been investigated through experiment and computer simulations using four models. Experiments and simulations have been performed using fluidity tester and commercial CFD code, Polyflow respectively. Die swells of rubber compounds in a capillary die were predicted using simplified viscoelastic model and the results were compared with the results of non-linear differential viscoelastic model, Phan-Thien-Tanner (PTT), Giesekus, POMPOM model. The results of simulations were also compared with the experiments. Die swells predicted by Simplified Viscoelastic and PTT models showed good agreement with experimental results. Pressure and velocity distribution, and circulation flows at the comer of capillary die have been well predicted by non-linear viscoelastic model. Howerer the circulation flow at the corner could not be predicted by the simplified viscoelastic model. The calculation time in simplified viscoelastic model was much less than non-liner viscoelastic mdoel. This calculation time is good merit of simplified viscoelastic model.