Abstract
A tapered double cantilever beam specimen was modified in order to evaluate the fracture toughness of scarf joints. The modification was relatively simple: the bond line which is normally perpendicular to the applied load with this type of specimen was inclined to form the scarf joint. With this change, both normal and shear components of force act on the crack plane. Hence, in addition to measuring the total strain energy release rate, Gtotal, its two components, the opening mode toughness, GI, and the edge shearing or tearing toughness, GIII, were measured as well. In spite of the fact that the separation loads increased continuously with increasing scarf angle, or over-lap length, Gtotaland GIII only increased so long as the ratio of over-lap length to thickness did not exceed 1.75∶1. Further increases in over-lap length decrease the toughness because of separation of fibres within the composite adherends.
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