Abstract
The fracture behaviour of polyethersulphone has been studied by combining fracture toughness measurements with optical examination of the craze and shear lips at the tip of the crack. It is shown that the behaviour can be very well described by a mixed mode fracture model in which the total strain energy release rate contains a plane strain term from the craze and a plane stress term from the shear lips. In unannealed samples the craze shape was well approximated by the Dugdale plastic zone model, but this was not so for annealed samples. The effect of annealing on the fracture behaviour is discussed in qualitative terms.
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