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Apparent Interfacial Failure in Mixed-Mode Adhesive Fracture.

机译:混合型粘接断裂中的表观界面破坏。

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Aluminium-epoxy adhesive specimens constructed with the bond at 45 deg to the direction of loading appear to fail very close to the interface. The actual locus of failure was investigated by C(14) labelling of the epoxy polymer and also by Auger spectroscopy profile analysis. Both techniques indicated a residual film of polymer a few hundred angstroms thick on the aluminium surface. The fracture energy of these specimens was determined and found to be affected by the surface roughness of the aluminium. The interfacial failure and the effect of surface finish on fracture are discussed in terms of the applied stress directing the failure toward the interface but the approach of the crack to the boundary being limited by the size of the crack tip deformation zone.

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