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Fitting of K-BKZ Model Parameters for the Simulation of Thermoforming

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Published/Copyright: June 6, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 14 Issue 3

Abstract

Thermoforming is characterized by large deformations of the polymeric material being processed. The simulation is complicated by the fact that an elastic material model cannot principally describe the thermoforming deformation precisely. In this respect non-linear and time-dependent viscoelastic behavior of the polymeric material has to be taken into account. In our research we used the K-BKZ model capable of describing viscoelasticity and large deformations. The parameters of this model were determined experimentally using a simple testing method. The method is derived from plug-assisted thermoforming. Computer analysis was used to evaluate the experiments: The tests performed were simulated using FEM (Finite Elements Method) repeatedly with different material parameters. The material parameters leading to a minimum sum of squares of differences between experimental and simulated values estimate the tested material behavior. It has been found that the final shape and the wall thickness distribution show a significant dependence on the material properties in case of deep thermoforming.

* Mail address: P. Sáha, Faculty of Technology Zlín, TGM 275, 762 72 Zlín, Czech Republic
Received: 1998-12-14
Accepted: 1999-4-30
Published Online: 2013-06-06
Published in Print: 1999-09-01

© 1999, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Editorial
  2. In Memory of Carl Klason (1938–1997)
  3. Mixing/Screw Extrusion
  4. Structuring of Interface-modified Polymer Blends
  5. Mixing Homologous High Viscosity Ratio Polymer Blends in Converging Flow
  6. The Effect of Miscibility on Rheological and Mechanical Properties of PCL/SAN Blends
  7. Effect of Twin-Screw Extruder Design and Process Conditions on Ultrafine CaCO3 Dispersion into PP
  8. Characterization of the Behavior and Blending Performance of a Continuous Mixer
  9. Die Extrusion
  10. Profile Die Design Based on Flow Balancing
  11. Capillary Flow of Hard-Metal Carbide Powder Compounds
  12. Fiber/Film
  13. Numerical Simulation of the Film Casting Process
  14. Molding
  15. Breakage and Buckling of Fibrous Reinforcements During Fabrication of Thermoplastic Matrix Composites
  16. Long Glass Fibre Reinforcement of Thermo Plastics
  17. Fitting of K-BKZ Model Parameters for the Simulation of Thermoforming
  18. Tensile Damage in Ternary Melamine-Formaldehyde Composites
https://doi.org/10.3139/217.1543

Articles in the same Issue

  1. Editorial
  2. In Memory of Carl Klason (1938–1997)
  3. Mixing/Screw Extrusion
  4. Structuring of Interface-modified Polymer Blends
  5. Mixing Homologous High Viscosity Ratio Polymer Blends in Converging Flow
  6. The Effect of Miscibility on Rheological and Mechanical Properties of PCL/SAN Blends
  7. Effect of Twin-Screw Extruder Design and Process Conditions on Ultrafine CaCO3 Dispersion into PP
  8. Characterization of the Behavior and Blending Performance of a Continuous Mixer
  9. Die Extrusion
  10. Profile Die Design Based on Flow Balancing
  11. Capillary Flow of Hard-Metal Carbide Powder Compounds
  12. Fiber/Film
  13. Numerical Simulation of the Film Casting Process
  14. Molding
  15. Breakage and Buckling of Fibrous Reinforcements During Fabrication of Thermoplastic Matrix Composites
  16. Long Glass Fibre Reinforcement of Thermo Plastics
  17. Fitting of K-BKZ Model Parameters for the Simulation of Thermoforming
  18. Tensile Damage in Ternary Melamine-Formaldehyde Composites
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