Abstract
This paper reports on an investigation of the mode I delamination fracture toughness of 0°/0° interfaces in a carbon-epoxy system (T800-924). It has been found that thicker starter films give a lower GIc. The toughness of a natural interface (ie unaffected by the presence of a starter film) has been found to be closest to the toughness measured using the thinnest starter films. Tests on 0°/0° interfaces in multidirectional laminates have shown that residual stresses have a significant effect on GIc. Finally, it has been shown that bend-twist coupling in the arms of the Mode I specimen can lead to considerable changes in the apparent toughness.
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