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 language | English |
|---|---|
| Pages (from-to) | 2433-2438 |
| Number of pages | 6 |
| Journal | Polymer (United Kingdom) |
| Volume | 37 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 1996 |
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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 journal › Article
}
TY - JOUR
T1 - On the essential and non-essential work of fracture of biaxial-oriented filled PET film
AU - Karger-Kocsis, J.
AU - Czigány, T.
PY - 1996
Y1 - 1996
N2 - 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.
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.
KW - Biaxial-oriented film
KW - Poly(ethylene terephthalate)
KW - Work of fracture
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UR - http://www.scopus.com/inward/citedby.url?scp=0030170051&partnerID=8YFLogxK
U2 - 10.1016/0032-3861(96)85355-9
DO - 10.1016/0032-3861(96)85355-9
M3 - Article
AN - SCOPUS:0030170051
VL - 37
SP - 2433
EP - 2438
JO - Polymer
JF - Polymer
SN - 0032-3861
IS - 12
ER -