# A New Viscoelastic Model for Polycarbonate Compressing Flow

## Authors

• Wei Cao National Engineering Research Center of Mold &Die, Zhengzhou University, Zhengzhou, Henan, 450002,China
• Yaqiang Shen Shenzhen Zhaowei Machinery & Electronics CO., LTD., Shenzhen, 518103,China
• Shixun Zhang National Engineering Research Center of Mold &Die, Zhengzhou University, Zhengzhou, Henan, 450002,China
• Tao Wang Beijing Institute of Aeronautical Materials, Beijing, 100095,China
• Yakun Wu National Engineering Research Center of Mold &Die, Zhengzhou University, Zhengzhou, Henan, 450002,China
• Changyu Shen National Engineering Research Center of Mold &Die, Zhengzhou University, Zhengzhou, Henan, 450002,China

## Abstract

To overcome the weakness of conventional models in describing compressing flow especially in start and end stages the shear rate derivative was added to the right side of PTT constitutive equation. The ability of describing the well-known ‘shear shinning’ and ‘stretch harden’ phenomena was first illustrated by theoretical analysis. Then the governing equations for compressing flow were established in terms of incompressible and isothermal fluid, and the numerical method was constructed to discretize the equations and get the compressing flow solutions. The experiments with four melt temperatures were conducted and the corresponding simulations were performed. The better agreements with experimental data indicates the modified PPT model is superior to the original PTT model in prediction of compressing flow. In addition, the proposed model is also validated with low and high compressing speed experiments.

## Keywords:

Viscoelastic; Constitutive model; Compressing flow; Numerical simulation

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