Effects of gauge length and strain rate on Fracture toughness of polyethylene terephthalate glycol (PETG) film using the essential Work of Fracture analysis

Essential Work of Fracture (EWF) analysis was used to study the fracture toughness of a PETG film. In the study of the gauge length (Z) effect on the specific essential work (w e ) using Z = 50, 100, 150, 200 and 250 mm, it is observed that w e is independent of gauge length, except that a slightly lower w e value was measured for Z = 50 mm. Interestingly, for specimens with long gauge lengths (Z ≥ 150 mm in this study), brittle fracture occurred. The minimum ligament length at which ductile/brittle transition took place was observed to decrease with increasing gauge length. There is a small strain rate effect on w e with loading rates less than 1 mm/min. But with higher loading rates, w e showed no strain rate sensitivity.

[1]  J. Karger‐Kocsis,et al.  Deformation rate dependence of the essential and non-essential work of fracture parameters in an amorphous copolyester , 1998 .

[2]  R. Li,et al.  Fracture Toughness of Elastomer-Modified Polypropylene , 1998 .

[3]  J. Karger‐Kocsis,et al.  Thickness dependence of work of fracture parameters of an amorphous copolyester , 1997 .

[4]  S. Hashemi.  Work of fracture of PBT/PC blend: Effect of specimen size, geometry, and rate of testing , 1997 .

[5]  Y. Mai,et al.  The essential fracture work concept for toughness measurement of ductile polymers , 1996 .

[6]  J. Karger‐Kocsis.  For what kind of polymer is the toughness assessment by the essential work concept straightforward? , 1996 .

[7]  Tibor Czigány,et al.  On the essential and non-essential work of fracture of biaxial-oriented filled PET film , 1996 .

[8]  J. Williams,et al.  Determination of the fracture toughness of polymeric films by the essential work method , 1994 .

[9]  S. Hashemi.  Plane-stress fracture of polycarbonate films , 1993, Journal of Materials Science.

[10]  A. G. Robertson,et al.  Plant stress fracture toughness of paper , 1993 .

[11]  B. Cotterell,et al.  Fracture toughness and fracture mechanisms of PBT/PC/IM blend , 1993 .

[12]  S. Hashemi,et al.  Plane-stress essential work of ductile fracture for polycarbonate , 1992 .

[13]  Y. Mai,et al.  Essential work of fracture and j‐integral measurements for ductile polymers , 1991 .

[14]  M. Takemori,et al.  Fracture toughness of impact‐modified polymers based on the J‐integral , 1989 .

[15]  J. Williams,et al.  J testing of toughened nylons , 1987 .

[16]  Y. Mai,et al.  The essential work of plane stress ductile fracture of linear polyethylenes , 1987 .

[17]  Y. Mai,et al.  On the essential work of ductile fracture in polymers , 1986 .

[18]  J. Williams,et al.  A fracture toughness study on low density and linear low density polyethylenes , 1986 .

[19]  B. Cotterell,et al.  Effects of pre-strain on plane stress ductile fracture in α-brass , 1980 .

[20]  B. Cotterell,et al.  The essential work of plane stress ductile fracture , 1977, International Journal of Fracture.

[21]  R. Hill,et al.  On discontinuous plastic states, with special reference to localized necking in thin sheets , 1952 .

[22]  R. Li,et al.  An investigation on the impact fracture characteristics of EPR toughened polypropylene , 1996 .

[23]  S. Hashemi,et al.  The essential work of plane-stress ductile fracture of poly(ether-ether ketone) thermoplastic , 1993, Journal of Materials Science.

[24]  S. Carr,et al.  The J integral fracture toughness and damage zone morphology in polyethylenes , 1991 .

[25]  Y. Mai,et al.  Effect of specimen geometry on the essential work of plane stress ductile fracture , 1985 .

[26]  J. G. Williams,et al.  Fracture Mechanics of Polymers , 1984 .