A Two-Surface Viscoplastic Model for the Structural Steel

Kim, Dong-Keon; Kim, Jinkyu

doi:10.1590/1679-78253572

Cited by 3 publications

(2 citation statements)

References 32 publications

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“…Examples of these models include the Johnson-Cook model for metals subjected to high strain rates and temperatures, 26 the elasto-visco-plastic constitutive model developed by Pipard et al 27 for mild steel and the two-surface model for rate-dependent viscoelasticity for structural steel by Kim and Kim. 28 However, the use of these material models in the current finite element software for system-level analysis is computationally expensive and requires significant implementation effort. Therefore, these models are mostly limited to the material-level analysis.…”

Section: Numerical Modelling Of Strain Rate Effectmentioning

confidence: 99%

Impact of loading rate during hybrid simulation on seismic response of steel structures

Huang

Tabkhi

Sadeghian

et al. 2022

Earthq Engng Struct Dyn

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This study investigates the influence of loading rates on the seismic response of steel structures. A series of coupon tests under typical earthquake-induced loading rates are carried out. In addition to the conventional monotonic tension test, the specimens are also tested under a discontinuous loading protocol that is analogous to the ramp-and-hold scheme employed in the pseudo-dynamic hybrid simulations. The test results are used to develop a uniaxial steel material model to account for the strain rate effect and stress relaxation. The material model facilitates the reuse of existing steel hysteresis models and can be used to model different structural components, such as columns, beams, braces, etc. The material model is then used for a parametric study to evaluate the impact of various loading rates on the global seismic response of a single degree of freedom structural system with different structural periods, and types and intensities of ground motions. It is found that the impact of loading rates is more significant for structures with a period of 0.5 s or less and it thus requires a fast control of the physical specimen in pseudo-dynamic hybrid testing. In addition, the material model is applied to a five-storey buckling restrained braced frame (BRBF) building with a structural period of 1.2 s. It is found that the earthquake-induced loading rates have a minor impact on the global response of the structure.

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Section: Numerical Modelling Of Strain Rate Effectmentioning

confidence: 99%

Impact of loading rate during hybrid simulation on seismic response of steel structures

Huang

Tabkhi

Sadeghian

et al. 2022

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

show abstract

“…McDowell [34] introduced a twosurface stress space model by incorporating the effects of changes in plastic strain range and nonproportionality of loading in the evolution of isotropic hardening in order to enhance the prediction accuracy of complex nonproportional deformation behaviours like cyclic ratcheting, mean stress relaxation, etc. D. Kim and J. Kim [35] developed a two-surface model for rate-dependent plasticity by combining both isotropic and kinematic hardening rules. is model was validated through both monotonic and cyclic loading cases using structural steels, where simulation results exhibited an excellent agreement with experimental values in terms of the maximum stress and shape of hysteresis.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Springback Behaviour in Micro Flexible Rolling of Crystalline Materials

Jiang

Wang

et al. 2018

Advances in Materials Science and Engineering

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This paper presents a constitutive modelling of the polycrystalline thin metal strip under a state of combined loading in microflexible rolling. The concept of grained inhomogeneity is incorporated into the classic Chaboche hardening model that accounts for the Bauschinger effect, in order to provide more precise description and analysis of the springback mechanism in the particular forming operation. The model is first implemented in the finite element program ABAQUS to numerically predict the stress-strain relationship of 304 stainless steel specimens over a range of average grain sizes. After validation of the developed model by comparison of predicted curves and actual stress-strain data points, it is further applied to predict the thickness directional springback in microflexible rolling of 304 stainless steel strips with initial thickness of 250 µm and reduction changing from 5 to 10%. The model predictions show a reasonable agreement with the experimental measurements and have proven to be more accurate than those obtained from the conventional multilinear isotropic hardening model in combination with the Voronoi tessellation technique. In addition, the variation of thickness directional springback along with the scatter effect is compared and analysed in regard to the average grain size utilising both qualitative and quantitative approaches in respect of distinct types of data at different reductions.

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A Step Towards a Unified Analysis of Soil-Structure Interaction Problems of Steel Strategic Structures

Ercolessi

Fierro

Castiglia

et al. 2023

Lecture Notes in Civil Engineering

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A Two-Surface Viscoplastic Model for the Structural Steel

Cited by 3 publications

References 32 publications

Impact of loading rate during hybrid simulation on seismic response of steel structures

Impact of loading rate during hybrid simulation on seismic response of steel structures

Analysis of Springback Behaviour in Micro Flexible Rolling of Crystalline Materials

A Step Towards a Unified Analysis of Soil-Structure Interaction Problems of Steel Strategic Structures

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