Simulation of the shaping of blanks for large-diameter pipe

Shinkin, V. N.; Kolikov, A. P.

doi:10.3103/s0967091211010128

Cited by 18 publications

(3 citation statements)

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“…When assessing the stress-strain state of a metal, it is necessary to establish the residual life of metal structures, stresses are usually not taken into account, arising in structures during the process of their manufacturing and remaining in the finished product. Nevertheless, as calculations show, for example, in the case of trunk pipelines [1], the magnitude of such residual stresses σres may approach the yield strength of the used metal. In some cases, for example, during the operation of field pipelines pumping corrosive water-oil emulsions, the presence of residual stresses can contribute to intensification of corrosion rate of the metal structures, which leads to their destruction [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Use of Magnetic Anisotropy Method for Assessing Residual Stresses in Metal Structures

Krivokrysenko

Popov

Bolobov

et al. 2020

KEM

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A series of experiments on measuring of difference between the main mechanical stresses (DPMS) was carried out using a mechanical stress scanner based on the magnetoanisotropic method. The magnitude of the DPMS is fixed when a magnetic field is induced on a carbon steel plate under uniaxial tension. A direct proportional relationship is shown between the magnitude of the DPMS signal recorded by the scanner and the magnitude of tensile stresses in the plate in the region of elastic deformation of steel. Measurement of the DPMS signal in the central part of similar plates previously subjected to elastic-plastic bending showed that positive values of the signal are fixed in the surface layers of the metal on the inside of the plate, which corresponds to tensile residual stresses, while the negative ones concentrate at the external surface, which corresponds to compressive stresses. A transverse incision on a curved plate from the inside leads to a decrease in the value of the signal of the DPMS, which indicates a decrease in the level of residual stresses in the metal. The values of the DPMS signal in the central part of the curved plate, recalculated using the established calibration dependence on the value of the residual stresses, were compared with the values of the stresses established by calculation, based on the Henki’s theorem on the unloading of an elastic-plastic body. A satisfactory convergence was obtained between the experimental and calculated data.

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Section: Introductionmentioning

confidence: 99%

Use of Magnetic Anisotropy Method for Assessing Residual Stresses in Metal Structures

Krivokrysenko

Popov

Bolobov

et al. 2020

KEM

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“…In the press, the sheet is bent over the whole length initially, from edge to the center, and then the other half of the sheet is shaped. Note that the litera ture contains analytical models for calculating the press profile for the required range of pipe of pipe pro duced by JCO technology [6][7][8]. However, it is diffi cult in practice to verify the radius of the shaped sec tion of pipe blank after relaxation.…”

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confidence: 99%

“…2); a and c are the axes of the second order curve. (An ellipse is assumed here, in contrast to the logarith mic helix in [7,8].) This problem is solved by means of a system of equations written for each cross section (for each point 1-7) in the form and so on up to point 7…”

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confidence: 99%

Shaping of thick sheet in the production of welded large-diameter pipe

Osadchii

Gaas²,

Zvonarev³

et al. 2014

Steel Transl.

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An analytical method is proposed for calculating the shaping parameters of thick sheet in the pro duction of large diameter pipe. This method is considered in several stages: formulation of a geometric model of the blank and the tool; numerical calculations; selection of the algorithm; and analysis of the results. Com parison of calculated and experimental shaping parameters for sheet used in the production of different types of large diameter pipe reveals good agreement. The proposed method is recommended for calculating the shaping parameters in the production of large diameter pipe and the setup so as to minimize the defects due to the geometry of the press.

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