English

Vol. 7 2, 2017 p 48-55

Pages

Article name, authors, abstract and keyword

48-55

Computer simulation of the formation process for a large-diameter pipe stock

Dmitry A. Neganov a, Grigoriy V. Nesterov a, Andrey A. Bogach a

a Pipeline Transport Institute, LLC (Transneft R&D, LLC), 47a, Sevastopolskiy prospect, Moscow, 117186, Russian Federation

https://doi.org/10.28999/2541-9595-2017-7-2-48-55

Abstract: The purpose of the work is to define residual stresses generated in metal of large-diameter pipes after the source sheet is bent. Ways of forming the pipe stocks used at the Russian plants were analyzed. A computer simulation of the pipe formation process was made via finite element method for 1,220 mm pipes of K56 strength class made by means of step forming, roller forming and press forming. Stresses in the metal were defined for each phase of the sheet billet deformation and for expansion. A connection between metal stressed state and molding parameters was analyzed in the course of simulation. An impact on molding procedures on the generation of areas with increased residual stress was established, and their position along the pipe was found. The maximum local residual stresses appear in the area of bending sides of the sheet billet, where they may reach up to 22 % of the regulated limit of the yield strength.

Keywords: pipe billet, forming, residual stresses, finite elements method

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