ЕСТЕСТВЕННЫЕ НАУКИ. 2014. № 2 УДК 539.3 FINITE ELEMENT MODELLING OF PIPELINE WITH VOLUMETRIC DEFECT (КОНЕЧНО-ЭЛЕМЕНТНОЕ МОДЕЛИРОВАНИЕ ТРУБОПРОВОДА С ОБЪЁМНЫМ ДЕФЕКТОМ) © 2014 г. <...> A.A. Lyapin, M.I. Chebakov, A. Dumitrescu, G. Zecheru Ляпин Александр Александрович – кандидат физикоматематических наук, младший научный сотрудник, Научно-исследовательский институт механики и прикладной математики Южного федерального университета, пр. <...> Чебаков Михаил Иванович – доктор физико-математических наук, профессор, заведующий отделом механики контактных взаимодействий, Научно-исследовательский институт механики и прикладной математики Южного федерального университета, пр. <...> Думитреску Андрей – доцент, Университет нефти и газа Плоешти, бул. <...> Зэкеру Георге – профессор, Университет нефти и газа Плоешти, бул. <...> Dumitrescu Andrei – Associate Professor, Petroleum-Gas University of Ploiesti, Bucharest Bd., 39, Ploiesti, 100030, Romania, e-mail: andrei_d@upg-ploiesti.ro. <...> Zecheru Gheorghe – Professor, Petroleum-Gas University of Ploiesti, Bucharest Bd., 39, Ploiesti, 100030, Romania, e-mail: gzecheru@upg-ploiesti.ro. <...> При помощи метода конечных элементов построены поля смещений, пластических деформаций и напряжений в среде. <...> The nonlinear static problem of the modeling of pipeline with volumetric surface defects, under inner pressure was considered. <...> Using the finite element approach unknown displacements and stresses fields were constructed. <...> The simulation was made using the appropriate model of plasticity for the pipeline material. <...> The influence of defect geometry on the stress-strain behavior of the pipeline system was investigated. <...> As a theoretical specimen different geometries of pipeline and volumetric surface defects were used. <...> According to [1] the pressure level for experiment differs from 6,134 to 12,27 MPa that is from 40 to 72 percents of the specified yield strength for the material. <...> Therefore the inner pressure for finite element simulation was chosen for these two cases. <...> The finite element analysis was performed for X42 steel that is the most widespread steel used for older pipelines (which might require repairs). <...> The corresponding constant set for steel alloy X42 that was used for simulation and experiment is presented in table, where 0 yield stress; –min. , N <...>