On the essential and non-essential work of fracture of biaxial-oriented filled PET film

Research output: Contribution to journalArticle

95 Citations (Scopus)

Abstract

The plane-stress fracture toughness of a biaxial-oriented, filled poly(ethylene terephthalate) (BOPET) film was determined by the essential work of fracture concept using tensile-loaded deeply double-edge notched (DDEN-T) specimens. Results suggested that the essential work of fracture (we) is a material parameter, whereas the non-essential or plastic work (βwp, where β is the shape factor of the plastic zone) depends on the testing conditions. Various approaches were used to assess wp either explicitly (uniaxial tensile and trouser tests) or via estimation of β [by infra-red thermography (IT)]. IT seemed to be the most reliable technique for this purpose. IT also answered the question whether necking precedes crack growth or these processes occur simultaneously during specimen loading. The out-of-plane type deformation (mode III) in the trouser test resulted in markedly lower we and higher wp values than those determined by in-plane (mode I) tests on DDEN-T specimens. The difference was attributed to the microstructure-related anisotropy of the PET film caused by biaxial drawing.

Original languageEnglish
Pages (from-to)2433-2438
Number of pages6
JournalPolymer (United Kingdom)
Volume37
Issue number12
DOIs
Publication statusPublished - 1996

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Plastics
Polyethylene Terephthalates
Polyethylene terephthalates
Fracture toughness
Crack propagation
Anisotropy
Microstructure
Testing

Keywords

  • Biaxial-oriented film
  • Poly(ethylene terephthalate)
  • Work of fracture

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics

Cite this

On the essential and non-essential work of fracture of biaxial-oriented filled PET film. / Karger-Kocsis, J.; Czigány, T.

In: Polymer (United Kingdom), Vol. 37, No. 12, 1996, p. 2433-2438.

Research output: Contribution to journalArticle

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AB - The plane-stress fracture toughness of a biaxial-oriented, filled poly(ethylene terephthalate) (BOPET) film was determined by the essential work of fracture concept using tensile-loaded deeply double-edge notched (DDEN-T) specimens. Results suggested that the essential work of fracture (we) is a material parameter, whereas the non-essential or plastic work (βwp, where β is the shape factor of the plastic zone) depends on the testing conditions. Various approaches were used to assess wp either explicitly (uniaxial tensile and trouser tests) or via estimation of β [by infra-red thermography (IT)]. IT seemed to be the most reliable technique for this purpose. IT also answered the question whether necking precedes crack growth or these processes occur simultaneously during specimen loading. The out-of-plane type deformation (mode III) in the trouser test resulted in markedly lower we and higher wp values than those determined by in-plane (mode I) tests on DDEN-T specimens. The difference was attributed to the microstructure-related anisotropy of the PET film caused by biaxial drawing.

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