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The fracture toughness of birch laminated composites was improved by reinforced adhesive

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Document pages: 11 pages

Abstract: In this paper, we test the hypothesis that the fracture toughness of birch laminated composites will be significantly improved by the combination of reinforced adhesive and bonded glass fiber reinforcement. We tested this hypothesis using a model composite consisting of perforated veneers that allows polyurethane adhesives to penetrate and strengthen the veneers in the composite. The mode I fracture properties of the model composite samples were tested, and the microstructure of the fracture surface was examined by scanning electron microscope. Our results clearly show that the fracture toughness of birch composites is significantly improved by strengthening and strengthening the bonding line with glass fiber. Our results also show the improvement of frature toughness depended on the level of reinforcement. Improvements in fracture toughness were related to the ability of the reinforcement to arrest crack development during fracture testing and the fibre bridging effect of glass-fibre in adhesive bond lines. We conclude that through-reinforcement is an effective way of improving the fracture toughness of laminated wood composites, but further research is needed to develop practical ways of creating such reinforcement in composites that more closely resemble commercial products.

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