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National Repository of Grey Literature 23 records found  beginprevious21 - 23  jump to record: Search took 0.01 seconds. 
Two-layer pipe - the influence of materials interface on creep crack behaviour
 Zouhar, Michal ; Hutař, Pavel ; Náhlík, Luboš
Nowadays the using of layered structures is increasing. The aim of this article is study the influence of material interface of two layer pipe with inner crack on the crack behaviour. The numerical model of two layer pipe was created and the creep crack growth was modelled (taking into account realistic crack shape evolution). The results of two layer pipe were compared with homogenous approximation and accuracy of the lifetime prediction was discussed.
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Fracture description of two- layer pipe with polypropylene protective layer
 Zouhar, Michal ; Hutař, Pavel ; Náhlík, Luboš ; Vallet, L.
Nowadays, using of layered polymer pipes is increase. Protective layer can contribute to the better mechanical resistance of basic material. In this paper the three-dimensional numerical model of pipe consisting of main pipe material and outer protective layer material is modeled. The creep crack propagation in main material is simulated and the influence of protective layer is observed. Presented description of the crack in two-layer pipe can help for more accurate estimation of pipe-system residual life time.
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Dimensioning of thick-walled pipe in creep
 Zouhar, Michal ; Hutař, Pavel ; Náhlík, Luboš ; Hlavoň, P.
The numerical simulations of the creep in the case of X10CrMoVNb91 steel were performed. Geometry of the objects studied well-fit usual parts of the pipe system. The discrepancies between numerical simulations and usual standard Design By Formula (DBF) used for the pipe system lifetime prediction were found. Therefore, accurate numerical simulations based on creep description of the material behaviour is necessary for the accurate estimation of the service conditions.
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National Repository of Grey Literature : 23 records found   beginprevious21 - 23  jump to record:
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