Abstract
Abstract - This paper presents results obtained via experimental measurements of residual stresses in the cross sections of longitudinal welded pipes. The experiment was carried out in different dimensions and thickness of the pipes where it is noticed that the smaller the diameter of the pipe, the greater the residual stresses because the degree of deformation during the production of pipes with smaller diameter is greater. Residual stresses are measured with strain gages set upon the outside wall of the pipes. The results received from the gages show considering amount of stress captured in the pipe wall because of cold plastic formation process [1]. After cutting the rings, their opening is recorded, which is variable and depends on several parameters such as: ring diameter, thickness, type of material and its reinforcement as well as the degree of plastic deformation when forming the pipe sheath [2]. The difference in the display of the measuring tape when the ring is in the open and closed position is the residual deformation that corresponds to the residual stresses that occurs in the ring.
Highlights
This paper presents results obtained via experimental measurements of residual stresses in the cross sections of longitudinal welded pipes
[1] The results obtained from computer simulations confirm the adequate selection of samples as well as the conclusions obtained from the analysis of mathematical models
[5] The nature of the residual stresses is clearly from tension character which is easy to understand from opened rings
Summary
According the results from the experimental investigations, some stages from the production process can be separated as influential over the stress distribution in the final product. Plastic formation process and welding modes play crucial role for defining the technology and the quality of the final product[3]. The material stress-strain distribution in the pipe cross section is changing significantly from the initial relaxed state[4]. In this paper it is investigated the influence of the plastic formation over the stress-strain distribution in pipe cross section and its influence in the mechanical properties of the final product [5]. Computer models are made according to the actual dimensions of the tested rings. Test samples are cut from random chosen pipes that are made in factory IMK-Uroshevac
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