Abstract
The fracture energy of a glass fibre-polyester composite has been measured by work of fracture (γf) measurements on bending beams, and by linear elastic fracture mechanics analyses (γi) of the bending beams and edge-notched tensile plates. It was found that for the bend specimens γi< γf. The work of fracture, γf, displayed a strain rate dependence, but there was no such dependence of γi. It is postulated that γi is determined by a debonding mechanism while γf is the sum of a debonding mechanism plus a pull-out contribution. The edge-notched tensile plate experiments showed that γi obtained from thick plates was less than that obtained from side-grooved plates, and that in each case there was a dependence of γi on crack size.
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