Caractérisation mécanique d'un acier destiné au transport du CO2 Supercritique

Abstract : Capture, transport, and storage of Carbon dioxide are well-known applications for their key role in the field of climate change and reduction of CO2 emissions. This process involves the use of some particular technologies, not only to collect and concentrate the CO2 emitted by the anthropogenic sources but also to transport it to a suitable storage location. The transport of such a big quantity of CO2 creates new challenges for designers and pipeline operators. For instance, CO2 phase behavior, the temperature reached during the decompression phase, the presence of various impurities as well as the high operating pressure. Contrary to natural gas and oil transportation structures, a very few studies have raised the issue of the integrity of CO2 pipeline. In order to meet the industry needs particularly in this CO2 integrity application, the present research was conducted to identify and to better comprehend pipeline failure mechanisms at high pressures. This work includes the development of a new numerical approach about running ductile fracture arrest for high pressure gas pipeline. To address this issue, we have initially used a theoretical approach based on the fundamental knowledge of Fracture Mechanics. Based on the crack-tip opening angle (CTOA) fracture criterion and the finite element method along with the node release technique, a new two-curve method (TCM) was proposed for the prediction of gas pipelines’ crack arrestability. The results of this newly developed method were discussed and compared to those obtained by using other methods commonly employed in the Fracture mechanics, for instance, Battelle-TCM, HLP and HLP-Sumitomo method
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Mohamed Ben Amara. Caractérisation mécanique d'un acier destiné au transport du CO2 Supercritique. Autre. Université de Lorraine, 2015. Français. ⟨NNT : 2015LORR0262⟩. ⟨tel-01754547⟩

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