A sequential investigation of the residual stresses and strains influence on the buckling of cold-formed thin-walled members

Kishino, Vitor Hiroshi; Kishino, Renato Takeo; Coda, Humberto Breves

doi:10.1016/j.tws.2022.109814

Cited by 3 publications

(1 citation statement)

References 33 publications

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“…Moreover, for the residual strain after plastic deformation, researchers in the field of plastic forming paid more attention to the variation of thickness distribution of sheet metal, but the thickness distribution was mainly dominated by plastic strain under loading process, and elastic strain (< 0.02) often could be ignored [29,30]. Notably, due to the strain hardening effect, non-uniform distribution of residual strain meant the non-uniform distribution of microhardness at the workpiece surface, and the microhardness was an important index in milling.…”

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confidence: 99%

Gradient thickness-dependent distribution of residual stress and springback of thin-walled TC4 titanium alloy sheet with variable thickness in collaborative manufacturing process of pre-plastic forming and milling

SHU,

REN,

ZHANG

et al. 2024

Preprint

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Thin-walled sheet components with variable thickness and complex curved surface are expanding considerably in the advanced manufacturing field of aerospace industry due to its aerodynamic shape and light-weight characteristics, and collaborative manufacturing method of pre-plastic forming and milling was used to solve the problems of low rough milling efficiency and large milling difficult of such components. However, the structural characteristics of thin-walled and variable thickness brought the problems of residual stress and springback after pre-plastic forming, which impacted the milling quality and increased milling allowance in subsequent milling. In this work, based on three-point bending tests of thin-walled TC4 titanium alloy sheets with different ratio of thickness variation (ζ) and its Finite Element Analyze (FEA), gradient thickness-dependent distribution of residual stress and springback after pre-plastic forming was systematically studied. The results showed that with the ζ increasing from 1 to 6, difference of residual stress (Δσres) between both sides increased from 0 to 356.81 MPa, difference of springback (ΔS) between both sides increased 0 to 0.23 mm, and Springback Angle (SA) increased from 11.02 ° to 11.88 °, which was due to the increasing of stress component along the breadth direction and the decreasing of strain component along the thickness direction, and specimen #5 (ζ = 3) had more uniform distribution of residual stress. In addition, through considering the decay of elastic modulus (E) after plastic deformation, absolute error of SA of specimen #6 (ζ = 6) was reduced from 1.98 ° to 0.95 °.

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confidence: 99%

Gradient thickness-dependent distribution of residual stress and springback of thin-walled TC4 titanium alloy sheet with variable thickness in collaborative manufacturing process of pre-plastic forming and milling

SHU,

REN,

ZHANG

et al. 2024

Preprint

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Corrugated steel web I-girder welding deformation and residual stress research

Yan,

Guan,

Luo

et al. 2023

Structures

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An Approach of Web Stiffener Calculation in Thin-Walled Columns

Stulpinas,

Daniūnas

2024

Journal of Civil Engineering and Management

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This article presents an analytical approach for calculating web stiffeners in thin-walled columns. A novel method is introduced, which treats each bending point in the cross-section web as a separate stiffener. The advantages of this calculation method are discussed, highlighting its increased versatility in designing cross-section geometry. The load-bearing strength of axially compressed thin-walled closed cross-section columns, calculated using this method, is compared to analytical calculations based on the Eurocode 3-1-3 methodology and to the finite element method analysis. Calculation results of columns with cross-sections including shallow web stiffeners were up to 9.22% less conservative when compared to the Eurocode 3-1-3 methodology. The results demonstrate great compliance of the proposed method for column crosssections with deep stiffeners. Finite element method (FEM) analysis was performed to verify the calculated load bearing strengths of the columns according to both calculation methodologies. FEM analysis confirmed the reliance of the calculated results and showed, that the load bearing strengths calculated using the newly presented methodology were ranging from 88.77% to 97.86% of load bearing strength calculated using finite element method. These results proved, that the proposed method provides an accurate load bearing strength of thin-walled columns with web stiffeners.

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A sequential investigation of the residual stresses and strains influence on the buckling of cold-formed thin-walled members

Cited by 3 publications

References 33 publications

Gradient thickness-dependent distribution of residual stress and springback of thin-walled TC4 titanium alloy sheet with variable thickness in collaborative manufacturing process of pre-plastic forming and milling

Gradient thickness-dependent distribution of residual stress and springback of thin-walled TC4 titanium alloy sheet with variable thickness in collaborative manufacturing process of pre-plastic forming and milling

Corrugated steel web I-girder welding deformation and residual stress research

An Approach of Web Stiffener Calculation in Thin-Walled Columns

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