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Vol.25, No.1, 2025, pp. 99–105 |
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ANALYSIS OF THE DEPENDENCE OF RESIDUAL STRESSES ON THE STRUCTURAL PARAMETERS OF VESSEL HEADS USING EXPERIMENTAL DESIGN Nedeljko Vukojević1*
1) University of Zenica, Faculty of Mechanical Engineering, Zenica, BOSNIA and HERZEGOVINA N. Vukojević https://orcid.org/0009-0000-3520-1054 ; *email: nedeljko.vukojevic@unze.ba F. Hadžikadunić https://orcid.org/0000-0002-1103-7285 ; A. Bajtarević-Jeleč https://orcid.org/0009-0001-6612-8467
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Abstract The large pressure vessel heads must be made by welding the base sheet in order to achieve the required diameter. The shaping of base sheets by the process of incremental sheet forming (ISF) introduces changes in the surface layers. Intense local plastic deformation creates local residual stresses that, together with the residual stresses from welding, can have a positive or negative effect on the overall stress state of the vessel heads. Using the experiment design, it is possible to make a functional dependence of structural parameters such as yield stress, sheet thickness and diameter with the magnitude of residual stresses. The influence of heat treatment was also taken into the analysis. For the observed process, an experimental design of a four-factor process based on a partial multi-factor orthogonal plan of the first order (semi-replicate) type 24-1 is used. Keywords: • welded pressure vessel heads • incremental sheet forming • experimental design • heat treatment • residual stress in HAZ |
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full article (683 kB)
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