Strength enhancements in cold-formed structural sections — Part I: Material testing

Afshan, Sheida; Rossi, Barbara; Gardner, Leroy

doi:10.1016/j.jcsr.2012.12.008

Cited by 143 publications

(89 citation statements)

References 15 publications

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“…recommendations for values of the n parameter are presented in Table 7, where the number of curves from which the recommended values have been derived is also provided. These recommended values are close to those proposed by Afshan et al [6], but benefit from a larger database of results, including all those considered by [6]. Note that the n values proposed herein are slightly higher than those recommended by Afshan et al [6].…”

Section: Analysis Of First Strain Hardening Exponent Nsupporting

confidence: 80%

“…These recommended values are close to those proposed by Afshan et al [6], but benefit from a larger database of results, including all those considered by [6]. Note that the n values proposed herein are slightly higher than those recommended by Afshan et al [6]. This is attributed to the different data sets that were analysed and the fact that the data set considered herein included a higher proportion of sheet material.…”

Section: Analysis Of First Strain Hardening Exponent Nsupporting

confidence: 76%

“…In previous recent studies conducted by the authors (Real et al [4], Arrayago et al [5] and Afshan et al [6]) experimental stress-strain data on austenitic, ferritic and duplex stainless steel material were generated and preliminary assessments of the material modelling provisions of EN 1993-1-4 were made. The need for further work was also highlighted.…”

Section: Additional Data Collected From the Literaturementioning

confidence: 99%

“…A similar approach was employed by Afshan et al [6]. Since the calculated values of the strain hardening parameters depend on the considered material model, assessment of two-stage models is presented in the next section in order to determine the most appropriate for further analysis.…”

Section: Group I Group Iimentioning

confidence: 99%

“…Values for these parameters can be obtained from measured stress-strain curves, but are also provided in Standards, such as EN 1993-1-4 [3] through tables and predictive expressions. However, recent research by Real et al [4], Arrayago et al [5] and Afshan et al [6] has shown that the parameter values derived from EN 1993-1-4 are not always accurate. Hence, this paper presents a detailed evaluation of predictive expressions for the key material parameters, gathered both from current design codes and proposed in the literature against a comprehensive database of stainless steel stress-strain curves.…”

Section: Introductionmentioning

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: Analysis Of First Strain Hardening Exponent Nsupporting

confidence: 80%