Numerical Simulation On The Rheologic Behavior In The Polymer Oscillation Injection Molding Process

This paper refer to the experimental data and result from the oscillations process equipment researched and made by our group, and based on the modified Leonov viscoelastic constitutive equation, theoretical validation and analysis, obtained by numerical methods, are point to the natural of the oscillatory shear flow of polymer melts in cavity during injection molding. It also discusses the various influences to the shear flow caused by the vibration parameters and tries to analyze part of result. We also hope the analytical result could be validated in the further research and could provide us quantitative reference in the future experiment. Base on the simulation, we got following conclusions:In the case of researching the variation regulation of the shear elastic strain with a superposition of oscillations, we find that the shear elastic strain of the first order syntony is linear to the frequency in the range low ones; it will increase with the raising of the frequency; In the region of high frequency, the shear elastic strain has nothing to do with the frequency. At the same time, it decreases as the deformation amplitudes r_o increasing. The phase difference exists between the shear elastic strain and strain according to the various oscillation. In the region of high frequency, for the corresponding phase angle δ_ω is small, that is the amplitude of the shear elastic stress c₁₂ is almost in phase with the amplitude of the strain r_o; At the low-frequency region, the corresponding phase angle δ_ω is big.In the vibration field, the loss modulus G" arise with the increasing of...