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Stress-Strain and Volume Change Characteristics of an Assemblage of Polymer Pellets

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Published/Copyright: June 21, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 13 Issue 4

Abstract

A series of experiments were performed on an assembly of four commercially available polymer pellets at room temperature. An automated deformation controlled triaxial testing system was used for the entire testing program. Lubricated end platens were used to assure uniform strain conditions during the application of compressive loading on the confined cylindrical specimen of a given polymer pellet type at a target bulk density. The test results in terms of the deviator stress-strain and volume change characteristics of polymer pellets were obtained for use in the modeling and analysis of solids conveying in plasticating screw extruders. Testing procedures are described that can be used routinely to obtain the strength and deformation behavior of an assemblage polymer pellets. The deviator stress-axial strain and volumetric strain-axial strain curves are presented for four confining stress levels (l00, 200, 300 and 400 k Pa) for these materials using both dry and saturated specimens. The water saturated specimens were used in parallel for obtaining reliable measurements of the volumetric strain variation during the application of deviator stress. The effect of using water as the pore fluid on the mechanical behavior was also discussed. The angles of internal friction of these four polymeric materials were determined and the use of Mohr-Coulomb failure criteria was evaluated. These confining pressure dependent friction angles are compared with the angle of repose measurements. The stress transfer coefficients as a function of wall friction for the potential states of confinement of these polymer pellets in the solids conveying portion of an extruder are also summarized.

* Mail address: Prof. D. Penumadu, Department of Civil and Environmental Engineering, William J. Rowley Laboratories, Clarkson University. Potsdam, NY 13699-5710, USA
Received: 1998-2-5
Accepted: 1998-9-8
Published Online: 2013-06-21
Published in Print: 1998-12-01

© 1998, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Fourth in a Series: Pioneers of Polymer Processing Alexander Parkes
  5. Screw Extrusion/Mixing
  6. Flow Analysis in Screw Extruders-Effect of Kinematic Conditions
  7. Distributive Mixing in an Axial Discharge Continous Mixer
  8. Fluid Mechanics of Intermeshing Counter-Rotating Twin Screw Extruders
  9. Stress-Strain and Volume Change Characteristics of an Assemblage of Polymer Pellets
  10. Utilization of Recycled Crumb Rubber as a Compounding Tool
  11. Fibers and Films
  12. Manufacture-Induced Inaccuracies of Spinning Dies1
  13. Modeling of Segmented Polyurethane Drying Process
  14. Roll Coating
  15. Numerical Calculation of the Velocity and Temperature Field in the Reverse Roll Coating
  16. Molding
  17. Simulation of Reactive Liquid Composite Molding
  18. Consistency and Flexibility of Multi Cavity Melt Control
  19. Structure and Properties of Injection Moldings of β-Crystal Nucleator-added PP
  20. Structure and Properties of Injection Moldings of β-Crystal Nucleator-added PP
  21. Warpage of Injection Moulded Plates and Corner Products
https://doi.org/10.3139/217.980347

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Fourth in a Series: Pioneers of Polymer Processing Alexander Parkes
  5. Screw Extrusion/Mixing
  6. Flow Analysis in Screw Extruders-Effect of Kinematic Conditions
  7. Distributive Mixing in an Axial Discharge Continous Mixer
  8. Fluid Mechanics of Intermeshing Counter-Rotating Twin Screw Extruders
  9. Stress-Strain and Volume Change Characteristics of an Assemblage of Polymer Pellets
  10. Utilization of Recycled Crumb Rubber as a Compounding Tool
  11. Fibers and Films
  12. Manufacture-Induced Inaccuracies of Spinning Dies1
  13. Modeling of Segmented Polyurethane Drying Process
  14. Roll Coating
  15. Numerical Calculation of the Velocity and Temperature Field in the Reverse Roll Coating
  16. Molding
  17. Simulation of Reactive Liquid Composite Molding
  18. Consistency and Flexibility of Multi Cavity Melt Control
  19. Structure and Properties of Injection Moldings of β-Crystal Nucleator-added PP
  20. Structure and Properties of Injection Moldings of β-Crystal Nucleator-added PP
  21. Warpage of Injection Moulded Plates and Corner Products
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