Etude des défauts présents dans des tuyaux soumis à une pression interne

Abstract : The aim of work is the study of pipes with hazardous defects under internal pressure. The problems semi-elliptic external notches in cylindrical shells are considered. The study is undertaken within the frame of fracture mechanics approaches both an experimental and numerical with using the finite elements method. The experimental study is curried out on the model pipe-like specimens, which were designed according to the CODAP recommendations. The measurement of local deformation around the notch area both circumferential and longitudinal direction was done by the gauge-extensometers. The fracture toughness of material was received from the Charpy tests. The numerical study is devoted to determination of the elastic and elastic-plastic stress fields at the notches in cylindrical shells. For case of elastic field, the stress intensity factors were calculated for the axes-symmetric and semi-elliptic notches according to their geometrical parameters and size of shells. The received results have been compared with the existed data in literature. For case of elastic-plastic field, the volumetric method is used to determine the notch stress intensity factor at the bottom of the longitudinal and circumferential notches. The calculation of the T-stress by finite elements method showed that this stress is stress of compression in the case both longitudinal and circumferential defects
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Hassane Moustabchir. Etude des défauts présents dans des tuyaux soumis à une pression interne. Autre [cond-mat.other]. Université Paul Verlaine - Metz, 2008. Français. ⟨NNT : 2008METZ002S⟩. ⟨tel-01752562⟩

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