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간략화된 점탄성 모델을 적용한 고무 컴파운드의 압출 해석
김지현 ( J. H. Kim ),홍진수 ( J. S. Hong ),최성현 ( S. H. Choi ),김학주 ( H. J. Kim ),류민영 ( M. Y. Lyu ) 한국고무학회 2011 엘라스토머 및 콤포지트 Vol.46 No.1
점탄성 흐름의 특성은 압출시 다이 스웰 현상에서 확인 할 수 있다. 본 연구는 이러한 점탄성 특성을 갖는 고무 컴파운드를 모세관 다이에서 비선형 점탄성 모델인 PTT 모델과 간략화된 점탄성 모델을 이용하여 압출현상을 모사하고 다이 스웰을 실험과 비교 하였다. 실험은 Fluidity Tester를 이용하였고 해석은 상용화된 CFD Code인 Polyflow를 이용하였다. 두 모델에 의해 예측된 다이 스웰은 실험과 유사한 결과를 보였다. 그러나 PTT 모델에서는 압력과 속도분포, 레저버의 모서리에서의 와류현상을 예측할 수 있었지만 간략화된 점탄성 모델에서는 예측할 수 없었다. 간략화된 점탄성 모델은 다이 내부의 세밀한 흐름현상을 예측하지는 못하지만 다이 스웰은 잘 예측할 수 있으며 PTT모델보다 해석시간이 매우 짧아서 이의 응용에 큰 장점을 갖고 있다고 판단된다. One of the viscoelastic flow behaviors during profile extrusion is the swelling of extrudate. In this study, die swell of rubber compound in the capillary die have been investigated through experiment and computer simulation. Simplified viscoelastic model and non-linear differential viscoelastic model such as PTT model have been used in the computer simulation. The simulation results have been compared with experimental data. Experiment and simulation have been performed using fluidity tester and commercial CFD code, Polyflow respectively. Die swells predicted by two models showed good agreement with experimental results. Pressure and velocity distribution, and circulation flow at the corner of reservoir have been well predicted by PTT model. Simplified viscoelastic model can not predict circulation flow at the corner of reservoir. However this model has an advantage in computation time compare with full viscoelastic model, PTT model.
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.