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Polymer Bulletin

, Volume 57, Issue 6, pp 989–998 | Cite as

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

  • F. Ronkay
  • T. CzigányEmail author
Article

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.

Keywords

Cavitation Acoustic Emission Shear Band Injection Molding Deformation Rate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    Lazurkin YS (1958) J Polym Sci 30:595Google Scholar
  2. 2.
    Allison SW, Ward IM (1967) J Appl Phys 18:1151Google Scholar
  3. 3.
    Coleman BD (1981) Arch Ration Mech An 83:115Google Scholar
  4. 4.
    Bobeth W (1993) Textile Faserstoffe. Beschaffenheit und Eigenschaften. Springer, BerlinGoogle Scholar
  5. 5.
    Kechekyan AS, Adrinova GP, Kargin VA (1970) Polym Sci 12:2743Google Scholar
  6. 6.
    Karger-Kocsis J, Moskala EJ (2001) J Mater Sci 36:3365Google Scholar
  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, WeinheimGoogle Scholar
  8. 8.
    Barenblatt GI (1970) Mech Solids 5:110Google Scholar
  9. 9.
    Adrinova GP, Kechekyan AS, Kargin VA (1971) J Polym Sci Pol Chem 9:1919Google Scholar
  10. 10.
    Roseen R (1974) J Mater Sci 9:929Google Scholar
  11. 11.
    Toda A (1993) Polymer 34:2306Google Scholar
  12. 12.
    Toda A (1994) Polymer 35:3638Google Scholar
  13. 13.
    Pakula T, Fischer EW (1981) J Polym Sci 19:1705Google Scholar
  14. 14.
    Godovsky YK (1992) Thermodynamic behavior of solid polymer in plastic deformation and cold drawing. In: Thermophysical properties of polymers. Springer-Verlag, BerlinGoogle Scholar
  15. 15.
    Ward IM (1990) Mechanical properties of solid polymers. John Wiley & Sons, New YorkGoogle Scholar
  16. 16.
    Bazhenov SL, Rodionova YA, Kechekyan AS (2003) Polym Sci Ser A 45:635Google Scholar
  17. 17.
    Karger-Kocsis J, Shang PP (2002) J Therm Anal Calorim 69:499Google Scholar
  18. 18.
    Gutierrez MCG, Karger-Kocsis J, Riekel C (2004) Chem Phys Lett 398:6Google Scholar
  19. 19.
    Ebener H, Pleuger B, Petermann J (1999) J Appl Polym Sci 71:813Google Scholar
  20. 20.
    Nevalainen K, MacKerron DH, Kuusipalo J (2005) Mater Chem Phys 92:540Google Scholar
  21. 21.
    Czigány T, Ostgathe M, Karger-Kocsis J (1998) J Reinf Plast Comp 17:250Google Scholar
  22. 22.
    Zhang Z, Wu S, Ren M, Xiao C (2004) Polymer 45:4361Google Scholar
  23. 23.
    Zhang Z, Ren M, Zhao J, Wu S, Sun H (2003) Polymer 44:2547Google Scholar

Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  1. 1.Department of Polymer Engineering, Faculty of Mechanical EngineeringBudapest University of Technology and EconomicsBudapestHungary

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