Although most of the research on the flow of viscoelastic fluids are isothermal cases, many flows of practical interest in polymer processing are non-isothermal. The combination of high viscosity of polymeric melts and high deformation rates results in the transformation of large amounts of mechanical energy into heat, and therefore a rise in temperature of the polymeric material. Therefore non-isothermal three-dimensional viscoelastic simulation is desired.
As far as non-isothermal viscoelastic simulation is concerned, the internal energy of fluids is usually assumed to be only a function of the temperature, but this is not a proper assumption for viscoelastic fluids. Further the problems of computational memory capacity, CPU time, and numerical convergence of viscoelastic flow simulations, non-isothermal three-dimensional viscoelastic simulation applicable to industrial flow behaviors has not yet been attempted.
In this study, we developed a numerical simulation for non-isothermal three-dimensional viscoelastic flows within dies considering the thermodynamic contribution that entropy elastic energy stores in the internal energy. Numerical results indicate that a consideration of thermodynamic contribution of viscoelastic materials is important to predict the detail temperature field.

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We have evaluated the orientation distribution function for each crystal plane under biaxial stretching in poly (p-phenylene sulfide) films. The pole figure divice familiar in X-ray diffraction was used. These distribution functions were compared with a simulation of orientation in crystallites after biaxial stretching by assuming polycrystalline aggregations. We analyzed the mechanism of orientation for the strip biaxial stretching process in which the (100), ‹001› and {110}, ‹001› slip systems dominated in four types of slip system by applying the maximum plastic work principle.

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