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

F. Ronkay, T. Czigány

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)989-998
Number of pages10
JournalPolymer Bulletin
Volume57
Issue number6
DOIs
Publication statusPublished - Dec 2006

Fingerprint

Polyethylene Terephthalates
polyethylene terephthalate
tensile tests
Polyethylene terephthalates
Tensile testing
injection
Cavitation
oscillations
cavities
propagation
cavitation flow
Heat radiation
Bottles
Acoustic emissions
Injection molding
stress propagation
Thermal effects
Drying
Cameras
thermograms

ASJC Scopus subject areas

  • Polymers and Plastics
  • Materials Chemistry

Cite this

Cavity formation and stress-oscillation during the tensile test of injection molded specimens made of PET. / Ronkay, F.; Czigány, T.

In: Polymer Bulletin, Vol. 57, No. 6, 12.2006, p. 989-998.

Research output: Contribution to journalArticle

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