Abstract
At intermediateK values a region where the crack speed is constant, that is, independent ofK, is observed in detergent cracking of low density polyethylene. This region is terminated at highK by one of two processes: in thin specimens the crack arrests, and in thick specimens it branches. The mechanism of crack branching involves the crack front twisting and then the initiation of a new crack at the centre of the specimen. A model has been proposed to explain this mechanism and also the fact that crack arrest or branching occur at approximately the sameK value. After branching the cracks continue to propagate at constant speed along paths whereK| ≈ 0 and if the specimen is wide enough, can branch again.
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