Structural design for non-linear metallic materials

By L. Gardner, M. Ashraf. 2006

347 citations recorded by the source corpus.

The material stress–strain behaviour of structural carbon steel may be suitably accurately reflected for design purposes by an idealised elastic, perfectly-plastic material model; such material behaviour lends itself to the concept of section classification. There are, however, a number of structural materials, such as aluminium, stainless steel and some high strength, cold-worked steels, where this idealised model becomes inaccurate due to non-linearity of the stress–strain response below the yield point and considerable strain hardening beyond the yield point. Resulting design methods, developed on the basis of the idealised material behaviour, are necessarily overly conservative. A new method has been developed that utilises a more accurate material model and a continuous measure of cross-section deformation capacity (rather than the discretised system of section classification) to provide more rational and efficient designs. This paper describes the basis for the proposed design method and presents a comparison with results obtained from laboratory testing and those predicted by the current Eurocode approach. The proposed design method offers average increases in member resistances of around 20% over the current Eurocode approach, and a reduction in scatter of the prediction.

Subfields: Building and Construction, Civil and Structural Engineering

View Paper: https://www.semanticscholar.org/paper/19c0e8fba60973ac98346653f684e9a579b827c2

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Building and Construction

1. L. Gardner
2. Najib Saliba
3. M. Theofanous
4. D. Lam
5. M. Ashraf
6. D. Nethercot
7. I. Arrayago
8. S. Afshan

In Civil and Structural Engineering

1. L. Gardner
2. Najib Saliba
3. M. Theofanous
4. D. Lam
5. S. Afshan
6. M. Ashraf
7. D. Nethercot
8. J. Machacek

Citations in the corpus

• Residual stresses in cold-rolled stainless steel hollow sections (2008, background): “0 are strain hardening exponents for the compound RambergOsgood material model described in [12].”
• Testing and numerical modelling of lean duplex stainless steel hollow section columns (2009, methodology): “0 used in the compound Ramberg-Osgood material model [10-13], which is a two-stage version of the basic Ramberg-Osgood model [14, 15].”
• Residual stress analysis of structural stainless steel sections (2008, neutral): “The development of this model for stainless steel stress-strain behaviour, from its origins in 1943 to the more recently adopted two-stage versions, is given in the following references [25, 26, 27, 28, 29, 30, 31].”
• Elevated temperature material properties of stainless steel alloys (2010, background): “0% proof stress instead of the ultimate stress was proposed [40,41].”
• Aluminium alloys as structural material: A review of research (2021, background): “Upon experimental testing on tubular sections, Su et al. [14] highlighted the significant contribution of the material strainhardening on the cross-section capacity and assessed the applicability of the Continuous Strength Method (CSM) [57,58], that was originally developed for stainless steel stock”
• Cross-section stability of lean duplex stainless steel welded I-sections (2013, methodology): “In the present study, the two-stage Ramberg-Osgood model described by Gardner and Ashraf [13] was employed to represent the stress-strain response of stainless steel; for incorporation into ABAQUS, this was approximated with a multi-linear model defined in terms of true stress and log plastic strain”
• Description of stress-strain curves for stainless steel alloys (2015, methodology): “6 The material model proposed by Mirambell and Real [7] was also modified by Gardner and Ashraf [9] in order to improve the accuracy of the model at low strains (less than approximately 10%) and to allow the model to be applied also to the description of compressive stress-strain behaviour.”
• Structural design of stainless steel concrete filled columns (2008, methodology): “0 are strain hardening exponents for the compound Ramberg-Osgood material model described in [34].”
• Finite element modelling of structural stainless steel cross-sections (2006, methodology): “Ashraf [18] analysed all available coupon tests performed on stainless steel and proposed specific values for n, n'0.2,1.0 and 1.0/0.2 for commonly used stainless steel grades so that Equation 9 can be used with the knowledge of only 2 common parameters – 0.2 and E0.”
• Mechanical and microstructural testing of wire and arc additively manufactured sheet material (2020, background): “0 features in the second stage in place of the ultimate tensile stress σu, was proposed by Gardner and Ashraf [53].”
• Stability and design of stainless steel structures – Review and outlook (2019, methodology): “This observation led to the development of a number of two-stage [7-9] (as well as three-stage [10] and multi-stage [11]) Ramberg–Osgood models that were capable of providing a single continuous representation of”