Etude de la nocivité de défauts dans les canalisations de transport de gaz tels les éraflures, les enfoncements ou leurs combinaisons

Abstract : The pipelines are widely used to transport fluid and gas because they are now, the cheapest mode of transport. The concern of operators is to ensure the maintenance of networks in order to preserve the security of reported, which are usually due to failure of these lines with defects, such as : corrosion, cracks in welds and external interferences. This thesis is related to external interferences for structures under internal pressure. These external interferences are considered to be made at low strain rate and leads to defects of types : dents or gouges or a combinaison of both (dents + gouges). The aim of this work is to propose a comprehensive study, both experimental and numerical of behaviour of a pipeline under pressure containing the defects described above. It is based on extending of the theory of the limit analysis and notch fracture mechanics for dents as defect and combination of dents and gouges. The verification of the validity of some empirical rules on the acceptability of dent depth will be made simultaneously. Two failure criteria were proposed : the Oyanes's ductile fracture criterion in the case of a dent and notch fracture mechanics using volumetric method associated with stress triaxiality in the case of a combined defect (dent+ gouge)
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Mustapha Allouti. Etude de la nocivité de défauts dans les canalisations de transport de gaz tels les éraflures, les enfoncements ou leurs combinaisons. Autre. Université Paul Verlaine - Metz, 2010. Français. ⟨NNT : 2010METZ033S⟩. ⟨tel-01748924⟩

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