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Identification of Cross-WLF Viscosity Model Parameters Using Optimization Technique

최적화기법을 이용한 Cross-WLF점도 모델 계수 추정

  • Kim, Sun-Yong (School of Mechanical Engineering, Ulsan College) ;
  • Park, Si-Hwan (School of Mechanical Engineering, Ulsan College)
  • 김선용 (울산과학대학교 기계공학부) ;
  • 박시환 (울산과학대학교 기계공학부)
  • Received : 2018.01.03
  • Accepted : 2018.04.06
  • Published : 2018.04.30

Abstract

Predicting the behavior of rheological polymers is highly shear rate- and temperature-dependent. The Cross-WLF viscosity model has become a powerful solution that describes the shear rate- and temperature-dependent characteristics. To estimate the behavior of polymers in computational simulations, the coefficients of the Cross-WLF model should be well identified. An identification technique was proposed to determine the Cross-WLF viscosity model coefficient. The assumption is that the Cross-WLF viscosity model well describes the real characteristics of polymers when the calculated viscosity with the parameters is identical to the reference data. In this study, Auto-desk Moldflow data were used as a reference. The numerical examples showed that the proposed method accurately identifies the Cross-WLF viscosity model coefficients.

Keywords

Cross-WLF viscosity model coefficients;Identification;Optimization procedure;Sensitivity analysis;Injection molding

Acknowledgement

Supported by : Ministry of Trade, industry & Energy (MI)

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