Abstract
While historical data indicate that the probability of a long, ductile fracture in a pipeline properly designed against fracture initiation is extremely small, increasinglystringent operating conditions make detailed studies of fracture propagation and arrest of continuing importance. Some existing approaches are reviewed in this paper; while these have generally proved successful in predicting fracture behaviour in conventional systems, problems have been encountered in recent years. The influence of gas decompression behaviour and the metallurgical properties of the steel are considered. The limitations in existing methods of measuring fracture propagation resistance are discussed, and requirements for improved techniques delineated. Finally, a programme of instrumented dropweight tear testing, incorporating highspeed photography, which is being carried out in conjunction with fullscale burst test studies, is briefly described.
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