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Fracture characterization of short glass fibre reinforced thermoplastic polyester by theJ-integral

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Abstract

Fracture initiation of short glass fibre reinforced thermoplastic polyester was characterized by theJ-integral measurement based on the energy release rate interpretation ofJ. The criticalJ value (J c) is shown to be a fracture characterizing parameter for the onset of the crack initiation in the injection moulded short glass fibre reinforced composite material. TheJ c value of the composite is estimated by be 6.0kJ m−2. This value is in good agreement with the linear elastic strain energy release rate (G c), since the composite exhibited a fairly linear stress-strain relationship. The estimated ratios ofJ c to the total energy absorbed per unit uncracked area are in good agreement with the analytically obtained values after the remote energy dissipation due to fibre and matrix interaction away from the crack tip has been subtracted from the total energy.

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Abbreviations

J :

J-integral

J c :

The criticalJ

G :

Elastic strain energy release rate

G c :

The criticalG

K l :

Opening mode stress intensity factor

\(K_{I_C } \) :

The criticalK l

P :

Applied load

x :

Load-point displacement

B :

Specimen thickness

E :

Young's modulus

v :

Poisson's ratio

F :

Force

Y :

Central deflection

a/W :

Ratio of the crack length to the specimen width

σ y :

Yield stress

U t :

Total strain energy in loading a specimen

U d :

Remotely dissipated strain energy after unloading

U t−d :

U t−U d

φ t :

Ratio ofJ c toU t per unit uncracked ligament

φ t−d :

Ratio ofJ c toU t−d per unit uncracked ligament.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Massachusetts, 01003, Amherst, MA, USA

    B. H. Kim & H. S. Kim

Authors
  1. B. H. Kim
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  2. H. S. Kim
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Kim, B.H., Kim, H.S. Fracture characterization of short glass fibre reinforced thermoplastic polyester by theJ-integral. J Mater Sci 24, 921–925 (1989). https://doi.org/10.1007/BF01148779

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  • DOI: https://doi.org/10.1007/BF01148779

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