Abstract
Tensile tests have shown that crazes formed in stressed polystyrene are regions of unimpaired strength. The study of fracture surfaces with the aid of carbon replicas in the transmission electron microscope has revealed that at the onset of fracture the material has a sponge-like character and a great deal of fibrous structure. Investigation of the changing surface detail produced as the crack propagates has given new information, particularly on slow secondary fracture features.
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