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Assessment of the influence of the bending form shape on the stress and plastic strain values in a cold bending pipe

Nozdrzykowski Krzysztof, Stępień Mateusz, Grządziel Zenon

Zeszyty Naukowe Politechniki Morskiej w Szczecinie

2024

nr 78 (150)

35--48

Abstract This paper presents the results of modelling research concerned with the technological process of the cold bending of a pipe. Stress and plastic strain studies are carried out using the finite element method (FEM) on a thick-walled pipe and various shapes of bending form. The results of the research are benchmarked in terms of the correctness of the implementation of the bending process, including the change in the pipe outside diameter and wall thickness. The level of ovalisation of the cross-section in the bending pipe is used as the primary criterion for assessing the correctness of the bending process. The results show that the most favourable properties in terms of minimising the ovalisation of the pipe cross-section are provided by the use of a bending form with a trapezoidal shape.