Three-Stage Full-Range Stress-Strain Model for Stainless Steels

Quach, Wai-Meng; Teng, Jinguang; Chung, Kwok Fai

doi:10.1061/(asce)0733-9445(2008)134:9(1518)

Cited by 183 publications

(124 citation statements)

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“…This requirement led to the development of three stage versions of the Ramberg-Osgood formulation: Quach et al [11] proposed a material model that uses the basic Ramberg-Osgood curve (Eq. (1)) for the first stage, covering stresses up to the 0.2% proof stress, the Gardner and Ashraf [9] model (Eq.…”

Section: Existing Materials Modelsmentioning

confidence: 99%

“…Based on the described analyses, the proposed predictive expressions and the recommended modifications to made to Annex C of EN1993-1-4 are summarised as follows: for austenitic, duplex and lean duplex (11) for ferritic grades (17) Additionally, the revised values for the first strain hardening parameter n, presented in Table 7, are recommended for inclusion in EN1993-1-4. The numeric values of Young's modulus for stainless steel proposed by Afshan et al [6] are also recommended herein.…”

Section: Summary Of Proposalsmentioning

confidence: 99%

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Description of stress–strain curves for stainless steel alloys

2015

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Aquesta és una còpia de la versió author's final draft d'un article publicat a la revista Materials and Design. ABSTRACTThere is a wide variety of stainless steel alloys, but all are characterized by a rounded stressstrain response with no sharply defined yield point. This behaviour can be represented analytically by different material models, the most popular of which are based on the RambergOsgood formulations or extensions thereof. The degree of roundedness, the level of strain hardening, the strain at ultimate stress and the ductility at fracture of the material all vary between grades, and need to be suitably captured for an accurate representation of the material to be achieved. The aim of the present study is to provide values and predictive expressions for the key parameters in existing stainless steel material models based on the analysis of a comprehensive experimental database. The database comprises experimental stress-strain curves collected from the literature, supplemented by some tensile tests on austenitic, ferritic and duplex stainless steel coupons conducted herein. It covers a range of stainless steel alloys, annealed and cold-worked material, and data from the rolling and transverse directions. In total, more than 600 measured stress-strain curves have been collected from 15 international research groups. Each curve from the database has been analysed in order to obtain the key material parameters through a curve fitting process based on least squares adjustment techniques. These parameter values have been compared to those calculated from existing predictive models, the 2 accuracy of which could therefore be evaluated. Revised expressions providing more accurate parameter predictions have been proposed where necessary. Finally, a second set of results, containing material parameters reported directly by others, with information of more than 400 specimens, has also been collected from the literature. Although these experimental results were not accessible as measured raw data, they enabled further confirmation of the suitability of the proposed equations. KEYWORDSConstitutive law, material modelling, nonlinear stress-strain behaviour, stress-strain curves, stainless steel, tensile tests HIGHLIGHTS  Tensile tests on austenitic, ferritic and duplex stainless steel coupons are presented.  A database of over 600 stainless steel stress-strain curves has been collected.

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Section: Existing Materials Modelsmentioning

confidence: 99%

Section: Summary Of Proposalsmentioning

confidence: 99%

Description of stress–strain curves for stainless steel alloys

2015

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“…Additionally, a three-stage model, which utilises Eq. (4) up to 2% strain, followed by a linear relationship has been proposed [50].…”

Section: Room Temperature Stress-strain Curvesmentioning

confidence: 99%

Elevated temperature material properties of stainless steel reinforcing bar

Gardner

Francis

et al. 2016

Construction and Building Materials

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Corrosion of carbon steel reinforcing bar can lead to deterioration of concrete structures, especially in regions where road salt is heavily used or in areas close to sea water. Although stainless steel reinforcing bar costs more than carbon steel, its selective use for high risk elements is cost-effective when the whole life costs of the structure are taken into account. Considerations for specifying stainless steel reinforcing bars and a review of applications are presented herein. Attention is then given to the elevated temperature properties of stainless steel reinforcing bars, which are needed for structural fire design, but have been unexplored to date. A programme of isothermal and anisothermal tensile tests on four types of stainless steel reinforcing bar is described: 1.4307 (304L), 1.4311 (304LN), 1.4162 (LDX 2101  ) and 1.4362 (2304). Bars of diameter 12 mm and 16 mm were studied, plain round and ribbed. Reduction factors were calculated for the key strength, stiffness and ductility properties and compared to equivalent factors for stainless steel plate and strip, as well as those for carbon steel reinforcement. The test results demonstrate that the reduction factors for 0.2% proof strength, strength at 2% strain and ultimate strength derived for stainless steel plate and strip can also be applied to stainless steel reinforcing bar. Revised reduction factors for ultimate strain and fracture strain at elevated temperatures have been proposed. The ability of two-stage Ramberg-Osgood expressions to capture accurately the stress-strain response of stainless steel reinforcement at both room temperature and elevated temperatures is also demonstrated.

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“…This model developed from tension coupon tests may underestimate the ultimate axial strengths of CFSST columns. The three-stage constitutive model for stainless steels proposed by Quach et al [2] accounts for different behavior of stainless steels in compression and in tension based on experimental observations. The threestage material model is believed to be a more accurate formulation than the two-stage one.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, the inversion of the three-stage stress-strain relationships for stainless steels [2,3] is incorporated in the fiber element model for simulating the nonlinear inelastic behavior of CFSST short columns under axial compression. The fiber element model accounts for the effects of concrete confinement and high strength concrete.…”

Section: Introductionmentioning

confidence: 99%