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Linear viscoelastic theory and the understanding of orientation, recoverable strain and mechanical properties resulting from thermoplastic processing

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Summary

The concept of recoverable strain is discussed and measured in connection with extrusion, injection molding and uniaxial tensile deformations at constant jaw speed. The data are treated phenomenologically according to the theory of linear viscoelasticity with a subsequent non-linearization. Recoverable strain for the case of extrusion is given in terms of the shear rate and capillary dimensions together with a knowledge of independently determined material parameters. Estimates of the high shear rate values of the equilibrium elastic compliance,J e , are given.

Zusammenfassung

Das Konzept der elastischen Dehnung wird diskutiert, und diesbezügliche Messungen werden in Verbindung mit Extrusion, Spritzgießen und einachsiger Verstreckung bei konstanter Verstreckgeschwindigkeit durchgeführt. Die Ergebnisse werden phänomenologisch diskutiert unter Anwendung der Theorie der linearen Viskoelastizität und nachfolgender Nicht-Linearisierung. Die elastische Dehnung bei der Extrusion wird in Abhängigkeit von der Schergeschwindigkeit und den Kapillardimensionen, sowie von einigen unabhängig bestimmten Materialparametern angegeben. Schätzwerte der GleichgewichtskomplianzJ e für hohe Schergeschwindigkeiten werden mitgeteilt.

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Authors and Affiliations

  1. Instituttet for Kemiindustri, Danmarks Tekniske Højskole, DK-2800, Lyngby, Danmark

    H. Heron, S. Pedersen & L. L. Chapoy

Authors
  1. H. Heron
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  2. S. Pedersen
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  3. L. L. Chapoy
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Additional information

In partial fulfilment of the Teknisk Licentiate degree.

With 16 figures and 5 tables

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Heron, H., Pedersen, S. & Chapoy, L.L. Linear viscoelastic theory and the understanding of orientation, recoverable strain and mechanical properties resulting from thermoplastic processing. Rheol Acta 15, 379–402 (1976). https://doi.org/10.1007/BF01574494

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  • DOI: https://doi.org/10.1007/BF01574494

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