1 Description of stress-strain curves for cold-formed steels Leroy Gardner and Xiang Yun * Department of Civil and Environmental Engineering, Imperial College London, London, SW7 2AZ, UK. * Corresponding author. E-mail address: [email protected] (X. Yun) Graphical abstract: Abstract: Cold-formed steels are generally characterized by a rounded stress-strain response with no sharply defined yield point. It is shown herein that this material behaviour can be accurately described by a two-stage Ramberg-Osgood model provided that the values of the key input parameters can be established. The focus of the present paper is to develop predictive expressions for these key parameters to enable the full engineering stress-strain response of cold-formed steels to be represented. The predictive expressions are based on the analysis of a comprehensive set of material stress-strain data collected from the literature. In total, more than Strain ε Stress f E ε 0.2 ε u f y f u E 0.2 y 0.002 n f f E f y u y y u 0.2 0.2 0.2 0.2 u y m f f f f f f E E f f 0 5 10 15 20 0 5 10 15 20 n test n pred 05 . 0 y ln 4 ln f n 1 2 3 4 5 6 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 m test f y /f u u y 3 . 3 1 f f m 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 0 200 400 600 800 1000 1200 1400 f u /f y f y (N/mm 2 ) 4 . 1 y y u 130 1 / f f f 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 ε u f y /f u u y u 1 6 . 0 f f Gardner, L. and Yun, X. (2018) Description of stress-strain curves for cold-formed steels. Construction and Building Material, 189, 527-538.
Description of stress-strain curves for cold-formed steels
Jun 24, 2023
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