Prediction of residual stresses and strains in cold-formed steel members

Cristopher D. Moen; Takeru Igusa; B. W. Schafer

doi:10.1016/j.tws.2008.02.002

Prediction of residual stresses and strains in cold-formed steel members

Cristopher D. Moen, Takeru Igusa, B. W. Schafer

Bloomberg School of Public Health

Research output: Contribution to journal › Article › peer-review

119 Scopus citations

Abstract

The objective of this paper is to provide an unambiguous mechanics-based prediction method for determination of initial residual stresses and effective plastic strains in cold-formed steel members. The method is founded on basic physical assumptions regarding plastic deformations and common industry practice in manufacturing. Sheet steel coiling and cross-section roll-forming are the manufacturing processes considered. The structural mechanics employed in the method are defined for each manufacturing stage and the end result is a series of closed-form algebraic equations for the prediction of residual stresses and strains. Prediction validity is evaluated with measured residual strains from existing experiments, and good agreement is shown. The primary motivation for the development of this method is to define the initial state of a cold-formed steel member for use in a subsequent nonlinear finite element analysis. The work also has impact on our present understanding of cold-work of forming effects in cold-formed steel members.

Original language	English (US)
Pages (from-to)	1274-1289
Number of pages	16
Journal	Thin-Walled Structures
Volume	46
Issue number	11
DOIs	https://doi.org/10.1016/j.tws.2008.02.002
State	Published - Nov 2008

Keywords

Cold-formed steel
Finite element analysis
Residual strains
Residual stresses

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
Mechanical Engineering

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10.1016/j.tws.2008.02.002

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title = "Prediction of residual stresses and strains in cold-formed steel members",

abstract = "The objective of this paper is to provide an unambiguous mechanics-based prediction method for determination of initial residual stresses and effective plastic strains in cold-formed steel members. The method is founded on basic physical assumptions regarding plastic deformations and common industry practice in manufacturing. Sheet steel coiling and cross-section roll-forming are the manufacturing processes considered. The structural mechanics employed in the method are defined for each manufacturing stage and the end result is a series of closed-form algebraic equations for the prediction of residual stresses and strains. Prediction validity is evaluated with measured residual strains from existing experiments, and good agreement is shown. The primary motivation for the development of this method is to define the initial state of a cold-formed steel member for use in a subsequent nonlinear finite element analysis. The work also has impact on our present understanding of cold-work of forming effects in cold-formed steel members.",

keywords = "Cold-formed steel, Finite element analysis, Residual strains, Residual stresses",

author = "Moen, {Cristopher D.} and Takeru Igusa and Schafer, {B. W.}",

note = "Funding Information: The development of this residual stress prediction method would not have been possible without accurate information about the manufacturing process of sheet steel coils and cold-formed steel members. Thanks to Clark Western Building Systems, Mittal Steel USA, and the Cold-Formed Steel Engineers Institute (CFSEI) for their important contributions to this research, especially Bill Craig, Ken Curtis, Tom Lemler, Joe Wellinghoff, Ezio Defrancesco, Jean Frasier, Narayan Pottore, and Don Allen. The authors are also grateful for the support provided by the American Iron and Steel Institute (AISI) in this effort. Appendix A The following flowchart summarizing the prediction method for residual stresses in roll-formed members. Appendix B The following flowchart summarizing the prediction method for effective plastic strains in roll-formed members. Appendix C ",

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AU - Moen, Cristopher D.

AU - Igusa, Takeru

AU - Schafer, B. W.

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PY - 2008/11

Y1 - 2008/11

N2 - The objective of this paper is to provide an unambiguous mechanics-based prediction method for determination of initial residual stresses and effective plastic strains in cold-formed steel members. The method is founded on basic physical assumptions regarding plastic deformations and common industry practice in manufacturing. Sheet steel coiling and cross-section roll-forming are the manufacturing processes considered. The structural mechanics employed in the method are defined for each manufacturing stage and the end result is a series of closed-form algebraic equations for the prediction of residual stresses and strains. Prediction validity is evaluated with measured residual strains from existing experiments, and good agreement is shown. The primary motivation for the development of this method is to define the initial state of a cold-formed steel member for use in a subsequent nonlinear finite element analysis. The work also has impact on our present understanding of cold-work of forming effects in cold-formed steel members.

AB - The objective of this paper is to provide an unambiguous mechanics-based prediction method for determination of initial residual stresses and effective plastic strains in cold-formed steel members. The method is founded on basic physical assumptions regarding plastic deformations and common industry practice in manufacturing. Sheet steel coiling and cross-section roll-forming are the manufacturing processes considered. The structural mechanics employed in the method are defined for each manufacturing stage and the end result is a series of closed-form algebraic equations for the prediction of residual stresses and strains. Prediction validity is evaluated with measured residual strains from existing experiments, and good agreement is shown. The primary motivation for the development of this method is to define the initial state of a cold-formed steel member for use in a subsequent nonlinear finite element analysis. The work also has impact on our present understanding of cold-work of forming effects in cold-formed steel members.

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Prediction of residual stresses and strains in cold-formed steel members

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Keywords

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