Advertisement

Cavity formation and stress-oscillation during the tensile test of injection molded specimens made of PET

  • 128 Accesses

  • 12 Citations

Summary

Behavior of specimens produced from one-way polyethylene terephthalate (PET) bottles by milling, drying and injection molding was studied under tensile load. Uniform and stable necking and neck propagation during tensile testing has been replaced under certain tensile rates by an oscillation of stress and neck propagation. Studying the crystallinity and density of specimens undergoing oscillation it was observed that they exhibit more than 50% cavitation. Results of acoustic emission measurements performed during tensile testing revealed that cavitation occurred simultaneously with neck propagation, periodically. Cavities were studied by scanning electron microscopy. In order to study the heat effects coupled with uniform neck propagation heat radiation of the surface was also detected. Infrared thermograms taken by an camera have shown that, within the oscillation cycle, simultaneously with the increase of the stress the temperature of the deformation zone increased, but when the stress decreased (during neck propagation) the temperature decreased.

This is a preview of subscription content, log in to check access.

Access options

Buy single article

Instant unlimited access to the full article PDF.

US$ 39.95

Price includes VAT for USA

Subscribe to journal

Immediate online access to all issues from 2019. Subscription will auto renew annually.

US$ 199

This is the net price. Taxes to be calculated in checkout.

References

  1. 1.

    Lazurkin YS (1958) J Polym Sci 30:595

  2. 2.

    Allison SW, Ward IM (1967) J Appl Phys 18:1151

  3. 3.

    Coleman BD (1981) Arch Ration Mech An 83:115

  4. 4.

    Bobeth W (1993) Textile Faserstoffe. Beschaffenheit und Eigenschaften. Springer, Berlin

  5. 5.

    Kechekyan AS, Adrinova GP, Kargin VA (1970) Polym Sci 12:2743

  6. 6.

    Karger-Kocsis J, Moskala EJ (2001) J Mater Sci 36:3365

  7. 7.

    Karger-Kocsis J (2002) Fracture and fatigue behavior of amorphous (co)polyesters as a function of molecular and network variables. In Fakirov E (ed) Handbook of thermoplastic polyesters. Wiley-VHC, Weinheim

  8. 8.

    Barenblatt GI (1970) Mech Solids 5:110

  9. 9.

    Adrinova GP, Kechekyan AS, Kargin VA (1971) J Polym Sci Pol Chem 9:1919

  10. 10.

    Roseen R (1974) J Mater Sci 9:929

  11. 11.

    Toda A (1993) Polymer 34:2306

  12. 12.

    Toda A (1994) Polymer 35:3638

  13. 13.

    Pakula T, Fischer EW (1981) J Polym Sci 19:1705

  14. 14.

    Godovsky YK (1992) Thermodynamic behavior of solid polymer in plastic deformation and cold drawing. In: Thermophysical properties of polymers. Springer-Verlag, Berlin

  15. 15.

    Ward IM (1990) Mechanical properties of solid polymers. John Wiley & Sons, New York

  16. 16.

    Bazhenov SL, Rodionova YA, Kechekyan AS (2003) Polym Sci Ser A 45:635

  17. 17.

    Karger-Kocsis J, Shang PP (2002) J Therm Anal Calorim 69:499

  18. 18.

    Gutierrez MCG, Karger-Kocsis J, Riekel C (2004) Chem Phys Lett 398:6

  19. 19.

    Ebener H, Pleuger B, Petermann J (1999) J Appl Polym Sci 71:813

  20. 20.

    Nevalainen K, MacKerron DH, Kuusipalo J (2005) Mater Chem Phys 92:540

  21. 21.

    Czigány T, Ostgathe M, Karger-Kocsis J (1998) J Reinf Plast Comp 17:250

  22. 22.

    Zhang Z, Wu S, Ren M, Xiao C (2004) Polymer 45:4361

  23. 23.

    Zhang Z, Ren M, Zhao J, Wu S, Sun H (2003) Polymer 44:2547

Download references

Author information

Correspondence to T. Czigány.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Ronkay, F., Czigány, T. Cavity formation and stress-oscillation during the tensile test of injection molded specimens made of PET. Polym. Bull. 57, 989–998 (2006). https://doi.org/10.1007/s00289-006-0670-8

Download citation

Keywords

  • Cavitation
  • Acoustic Emission
  • Shear Band
  • Injection Molding
  • Deformation Rate