The Role of Residual Stresses in the Performance and Durability of Prestressing Steel Wires

Atienza, J. M.; Ruiz-Hervías, J.; Calafat, Manuel Elices

doi:10.1007/s11340-012-9597-1

Cited by 17 publications

(7 citation statements)

References 52 publications

(94 reference statements)

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“…The production process included the following technological operations: stabilization, surface preparation for drawing, multistage cold drawing, stranding, straightening, mechanicalthermal treatment. Since the wire drawing technology involves high strain degrees ~88-90%, this process will inevitably lead to the residual stresses generation that directly affect both the mechanical and exploitation properties of the future PSC strand, and the stability of the process of stranding [13][14][15][16][17][18][19][20]. For this reason, the analysis of the technological process should be based on the assessment of the absolute values and distribution of residual stresses that make the most significant contribution to the stress-strain state of PSC strand.…”

Section: Methodsmentioning

confidence: 99%

FEM research of internal stresses evolution in the prestressing strand production

Korhunov

Medvedeva

Ivekeeva

et al. 2020

METAL 2020 Conference Proeedings

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The article presents the finite-element modeling results of stranding, reduction, straightening and mechanicalthermal treatment (MTT) of prestressing strand (PSC strand). Computer models took into account the distribution of residual stresses formed at the preliminary stage of wire drawing. During the simulation, the effect of MTT on the internal stresses of the wires was studied: residual stresses after the drawing process and additional stresses after the stranding. All studied methods demonstrated a positive effect not only from the point of eliminating internal stresses, but also from the point of view of their favorable redistribution. The reduction of PSC strand in a monolith tool with strain degree 1-3% allows to minimize tensile stresses on the surface of the wires and save compressive stresses in the center of the wires. The straightening by a group of 5 rolls made it possible to reduce the tension of outer wires twice. The MTT application, combining the effects of various physical nature, made it possible to control over a wide range the redistribution of residual stresses in the wires after high strain degrees and the additional stresses created during the stranding, which affect the preservation of the geometric parameters of the PSC strand. The study showed that to eliminate longitudinal residual stresses, the magnitude of the tension in the MTT is the most important parameter. Therefore, with a minimum value of tension, the residual stresses are not redistributed either in the central or in the surface layers, regardless of the temperature of the MTT. However, with tension above 70 kN and a temperature of 380-400°C, the residual stresses in the center and on the surface of the wires are balanced or almost completely eliminated.

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Section: Methodsmentioning

confidence: 99%

FEM research of internal stresses evolution in the prestressing strand production

Korhunov

Medvedeva

Ivekeeva

et al. 2020

METAL 2020 Conference Proeedings

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“…As the wires for prestressing strands are normally drawn at high deformation rates reaching 88-90%, this inevitably creates residual stresses, which affect both the mechanical properties and performance of the final strand, as well as the stranding consistency [13][14][15][16][17][18][19][20]. That's why analysis of the 7-wire prestressing strand production process should be based on evaluation of absolute…”

Section: Materials and Methods Of Researchmentioning

confidence: 99%

FEM study of internal stresses evolution in prestressing strands

Корчунов¹,

Medvedeva²,

Ivekeeva³

et al. 2020

cisisr

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This paper describes the results of modeling when the processes of stranding, reduction, straightening and thermo-mechanical treatment (TMT) of prestressing strands were simulated with the help of finite-element method. The distribution of residual stresses used in the simulation models refers to the stresses created at the preliminary stage of wire drawing. The simulation study looked at the effect of thermo-mechanical treatment on the internal wire stresses: residual stresses resultant from the drawing process and further stranding stresses. All studied methods demonstrated a positive effect not only in terms of eliminating internal stresses, but also from the point of view of their redistribution. Reduction of a strand in a solid tool at the ratios of 1–3 % allows to create tensile stresses at the surface of the wire and retain compressive stresses in its core. Straightening in a 5-roller group helped reach a double relaxation in outer wires. TMT, a process combining different physical effects, enabled to control within a broad range the redistribution of residual stresses in steel that was subjected to prior drawing at high deformation ratios. Such residual stresses occur as a result of stranding stresses that accompany the stranding operation and can affect the geometry of the strand. The study showed that tension as a TMT parameter plays a greater role in the elimination of longitudinal residual stresses. That’s why, at the minimum tension, almost no redistribution of residual stresses occur either in the central or in the near-surface layers irrespective of the TMT temperature regime applied. However, when the tension exceeding 70 kN is applied at the temperatures of 380–400 °C, the central and surface residual stresses balance off in the wire or almost disappear. This research was carried out under the Decree No. 220 dated 9th April 2010 of the Government of the Russian Federation (Contract No. 075-15-2019-869 dated 12th May 2019) and was funded by the Russian Science Foundation (Project No. 20-69-46042 dated 20th May 2020) and by the Russian Ministry of Education and Science with the goal of developing high-tech production (contract nos. 02.G25.31.078, December 1, 2015; and MK204895, July 27, 2015).

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“…The disadvantage of the FE analysis is the complexity in preparing input data, selecting proper output variables, and interpreting analysis results [16]. Works carried out in the last years in the field of measurement and simulation of RS in cold drawn products have shown that it is possible to obtain reliable quantitative RS values and, in addition to this, to compute numerically RS by modeling the cold-drawing process [9].…”

Section: Finite Element Methodsmentioning

confidence: 99%

“…In operations like tube drawing, welding, machining and grinding, undesirable RS may develop. Cold-forming generates RS arising from the elastic response to inhomogeneous distribution of plastic deformation [9]. Depending on how RS interact with external loads, they can influence the mechanical behavior and lifetime of components in a positive or negative way.…”

Section: Residual Stressesmentioning

confidence: 99%

Residual stresses evolution in Cu tubes, cold drawn with tilted dies – Neutron diffraction measurements and finite element simulation

et al. 2016

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The Role of Residual Stresses in the Performance and Durability of Prestressing Steel Wires

Cited by 17 publications

References 52 publications

FEM research of internal stresses evolution in the prestressing strand production

FEM research of internal stresses evolution in the prestressing strand production

FEM study of internal stresses evolution in prestressing strands

Residual stresses evolution in Cu tubes, cold drawn with tilted dies – Neutron diffraction measurements and finite element simulation

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