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- W2085161657 abstract "This paper reviews the problem of crack propagation in gas pressurised pipelines. After summarising the fracture control philosophy for pipelines, the main terminology and basic concepts are defined. A review of the brittle fracture problem summarises Battelle and British Gas studies relating fracture appearance and crack behaviour, and the background to the adoption of the DWTT fracture appearance criterion in specifications is detailed. The application of the strain energy theory to full-scale test results is discussed. A balance between strain energy stored in the pipe wall and fracture energy explains why brittle fractures arrest if the stress is below a critical level. The problem of ductile fracture propagation is reviewed and the results of full-size tests carried out by British Gas to provide toughness levels for fracture arrest are presented. The nature of ductile fracture propagation is discussed with reference to analogies with fracture initiation. Steady state, constant velocity, fractures imply specific shapes of the G (energy available)-velocity characteristic curves. In particular, a falling G with increasing fracture velocity is necessary. Some published theories to account for this effect are summarised and it is concluded that considerations of inertia in the fractured pipe wall provide the required relationship. Laboratory toughness tests for assessing brittle and ductile fracture resistance in relation to pipeline fracture behaviour are discussed. The relevance of fracture mechanics tests, particularly R curve analysis, is highlighted. The paper concludes with a list of areas of work which warrant further study." @default.
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- W2085161657 date "1974-10-01" @default.
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- W2085161657 title "Fracture propagation control in gas pipelines: A survey of relevant studies" @default.
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- W2085161657 doi "https://doi.org/10.1016/0308-0161(74)90007-6" @default.
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