Imposed curvature of an elastic-plastic strip: application   to simulation of coils

Weisz-Patrault, Daniel; Ehrlacher, Alain

doi:10.1051/meca/2016038

Cited by 5 publications

(5 citation statements)

References 19 publications

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“…Indeed, plastic deformations and phase changes occur during the winding of the strip on itself. Based on previous works [22,23], a mechanical model has been recently proposed by Weisz-Patrault et al [24] in order to solve (with reasonable computation times) this highly nonlinear problem, where rough contacts of the strip on itself, elastic-plastic behavior and large rotations are involved. The final residual stress profile is one of the main outputs.…”

Section: Applicationsmentioning

confidence: 99%

Coupled heat conduction and multiphase change problem accounting for thermal contact resistance

Weisz-Patrault

2017

International Journal of Heat and Mass Transfer

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International audienceIn this paper, heat conduction coupled with multiphase changes are considered in a cylindrical multilayer composite accounting for thermal contact resistance depending on contact pressures and roughness parameters. A numerical simulation is proposed using both analytical developments and numerical computations. The presented modeling strategy relies on an algorithm that alternates between heat conduction accounting for volumetric heat sources and a multi-phase change model based on non-isothermal Avrami's equation using the isokinetic assumption. Applications to coiling process (winding of a steel strip on itself) are considered. Indeed, phase changes determine the microstructure of the final material and are responsible for residual stresses that create flatness defects. A Finite Element modeling is used for validating the presented solution and numerical results are presented and discussed

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Section: Applicationsmentioning

confidence: 99%

Coupled heat conduction and multiphase change problem accounting for thermal contact resistance

Weisz-Patrault

2017

International Journal of Heat and Mass Transfer

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“…Figure 3 shows a general methodology to predict the residual stresses. Stage 1 is essential for comparison with the 2D-FE technique in [14] where previous studies [12,31] demonstrated the effect of coil radius-to-thickness ratios at D/t < 800. Figure 3 shows the general methodology of the finite element modelling strategies implemented in this work.…”

Section: General Methodologymentioning

confidence: 99%

Numerical Prediction of Residual Stresses Distribution in Thin-Walled Press-Braked Stainless Steel Sections

et al. 2020

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Stainless steels are increasingly used in construction today, especially in harsh environments, in which steel corrosion commonly occurs. Cold-formed stainless steel structures are currently increasing in popularity because of its efficiency in load-bearing capacity and its appealing architectural appearance. Cold-rolling and press-braking are the cold-working processes used in the forming of stainless steel sections. Press braking can produce large cross-sections from thin to thick-walled sections compared to cold-rolling. Cold-forming in press-braked sections significantly affect member behaviour and joints; therefore, they have attained great attention from many researchers to initiate investigations on those effects. This paper examines the behaviour of residual stress distribution of stainless steel press-braked sections by implementing three-dimensional finite element (3D-FE) technique. The study proposed a full finite element procedure to predict the residual stresses starting from coiling-uncoiling to press-braking. This work considered material anisotropy to examine its effect on the residual stress distribution. The technique adopted was compared with different finite element techniques in the literature. This study also provided a parametric study for three corner radius-to-thickness ratios looking at the through-thickness residual stress distribution of four stainless steels (i.e., ferritic, austenitic, duplex, lean duplex) in which have their own chemical composition. In conclusion, the comparison showed that the adopted technique provides a detailed prediction of residual stress distribution. The influence of geometrical aspects is more pronounced than the material properties. Neglecting the material anisotropy shows higher shifting in the neutral axis. The parametric study showed that all stainless steel types have the same stress through-thickness distribution. Moreover, R/t ratios’ effect is insignificant in all transverse residual stress distributions, but a slight change to R/t ratios can affect the longitudinal residual stress distribution.

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“…It is also related to the microscopic contact behaviors between rough surfaces, as is commonly observed in linear materials including polyester films [33][34][35] and metal sheets [29,32,[36][37][38]. Other structural factors may include geometrical nonuniformities like thickness variations [39,40]. In most materials, as the approach of thin sheets forms more contact points and moves the contacting asperities closer, the overall stiffness of the stack increases, slowly at first, followed by a rapid growth [30,41].…”

Section: Compression Of Stacked Thin Sheetsmentioning

confidence: 99%

Measurement and analysis of winding stresses in dry-wound pancake coils considering nonlinear compressive behaviors

Yan,

Kim,

Bong

et al. 2023

Supercond. Sci. Technol.

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Considering coil stress management, conductor thermal stability, and susceptibility to delamination, the dry-winding approach has been gradually applied and tested in high-temperature-superconducting coils wound with REBa2Cu3O 7 − x (REBCO) coated conductors (CCs). In dry-wound coils, the winding tension can be a useful tool for managing the mechanical stresses and maintaining the structural stability. It is also related to the contact resistivity characteristics of no-insulation and metal-as-insulation coils. In this paper, we present a study on the winding stresses in dry-wound pancake coils considering nonlinear compressive behaviors in the radial direction. Coils wound with stainless-steel (SS) tapes and REBCO CCs were prepared, respectively, with various sizes (90–140 turns) and winding tensions (26–61 MPa). The radial pressure was obtained by applying the pressure measurement films, which cover a pressure range up to 50 MPa. A relatively moderate radial pressure buildup was observed in coils wound with SS tapes, indicating that the effective radial modulus of the coil as an entity is considerably lower compared to the tensile modulus in the azimuthal direction. This is consistent with the nonlinear stress–strain relationship of stacked thin sheets under transverse compression, which can be further explained by the contact behaviors between two rough surfaces. The average radial pressure in CC coils shared similar characteristics as that in SS coils, whereas the radial stress along the conductor edges were significantly higher compared to the middle. Cross-sectional microscopy of the CCs suggests that this can be primarily attributed to the thickness variations across the conductor width. These results suggest that the microscopic rough-surface contact and thickness variation of the wound tape play a critical role in the coil stiffness as well as the winding stress distributions.

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Imposed curvature of an elastic-plastic strip: application to simulation of coils

Cited by 5 publications

References 19 publications

Coupled heat conduction and multiphase change problem accounting for thermal contact resistance

Coupled heat conduction and multiphase change problem accounting for thermal contact resistance

Numerical Prediction of Residual Stresses Distribution in Thin-Walled Press-Braked Stainless Steel Sections

Measurement and analysis of winding stresses in dry-wound pancake coils considering nonlinear compressive behaviors

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