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Frontiers of Structural and Civil Engineering

Front Struc Civil Eng    2013, Vol. 7 Issue (4) : 466-476     https://doi.org/10.1007/s11709-013-0219-5
RESEARCH ARTICLE |
Prediction of cyclic large plasticity for prestrained structural steel using only tensile coupon tests
Liang-Jiu JIA(), Tsuyoshi KOYAMA, Hitoshi KUWAMURA
Department of Architecture, School of Engineering, the University of Tokyo, Tokyo 113-8656, Japan
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Abstract

Cold-formed steel members, which experience complicated prestrain histories, are frequently applied in structural engineering. This paper aims to predict cyclic plasticity of structural steels with tensile and compressive prestrain. Monotonic and cyclic tests on hourglass specimens with tensile and compressive prestrain are conducted, and compared with numerical simulations using the Chaboche model. Two approaches are taken in the simulation. The first requires only the monotonic tensile test data from the prestrained steels, and the second requires both the monotonic tensile test data from the virgin steel and the prestrain histories. The first approach slightly overestimates the compressive stress for specimens with tensile prestrain, while the second approach is able to accurately predict the cyclic plasticity in specimens with tensile and compressive prestrain.

Keywords cyclic plasticity      prestrain      Chaboche model      mild steel     
Corresponding Authors: JIA Liang-Jiu,Email:LJ_JIA@hotmail.com   
Issue Date: 05 December 2013
 Cite this article:   
Liang-Jiu JIA,Tsuyoshi KOYAMA,Hitoshi KUWAMURA. Prediction of cyclic large plasticity for prestrained structural steel using only tensile coupon tests[J]. Front Struc Civil Eng, 2013, 7(4): 466-476.
 URL:  
http://journal.hep.com.cn/fsce/EN/10.1007/s11709-013-0219-5
http://journal.hep.com.cn/fsce/EN/Y2013/V7/I4/466
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Liang-Jiu JIA
Tsuyoshi KOYAMA
Hitoshi KUWAMURA
Fig.1  Illustration of backstresses in a uniaxial stress state for Chaboche model
Fig.2  Configurations of a coupon before and after necking occurs. (a) Before necking; (b) after necking
Fig.3  Illustration of assumptions in modified weighted factor method
Fig.4  Configuration of smooth round coupons
Fig.5  Setup of smooth round coupon tests
Fig.6  Numerical model simulating necking (unit: mm)
Fig.7  Load versus deformation curve obtained by different methods
Fig.8  Relationship between monotonic and cyclic true stress-true strain
specimensfirst step apply prestrainsecond step pull to fracture
KA085% tensile prestrainmonotonic tension
KA095% tensile prestraincyclic (Fig. 12)
KA105% compressive prestrainmonotonic tension
KA115% compressive prestraincyclic (Fig. 12)
Tab.1  Loading programs for specimens
Fig.9  Configuration of hourglass coupons before prestraining
Fig.10  Sampling of hourglass coupons
Fig.11  Setup for hourglass coupons
Fig.12  Cyclic loading history for KA09 and KA11
Fig.13  Comparison of experimental and numerical results for hourglass specimens. (a) KA08; (b) KA09; (c) KA10; (d) KA11
Fig.14  FE models for hourglass specimens. (a) Whole model; (b) partial model
Model parametersVirgin materialKA10 with compressive prestrain(second loading step)KA08 with tensile prestrain(second loading step)
σy0255.9446.3246.5
C126.9135.8104.5
C226.9301.71267.3
C31617.2286.73992.8
γ1000
γ2012.713.4
γ310.713.584.4
k5.82. 8910.97
Q227.8162.2197.0
Tab.2  Model parameters of Chaboche model
Fig.15  Comparison of coupon test result and KA01
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