Generalized multistage mechanical model for nonlinear metallic materials

Petr Hradil (Corresponding Author), Asko Talja, Esther Real, Enrique Mirambell, Barbara Rossi

Research output: Contribution to journalArticleScientificpeer-review

13 Citations (Scopus)

Abstract

Metallic alloys have a significant role in thin-walled engineering structures due to their unique properties such as corrosion resistance, low density or durability. Their mechanical behaviour is usually nonlinear, and this nonlinearity can be further increased during the work-hardening process. In such cases, designers have to take the proper stress–strain relationship into account to obtain reliable prediction of deformations or internal forces. In this paper, a theoretical model is proposed to match different kinds of measured data or already existing stress–strain models. It is flexible to accommodate any number of measured or recommended material parameters, and therefore makes design rules independent on testing standards. It is particularly suitable for computer code implementation. The approximate inversion of the multistage model is also included in the presented study. The general formula is applied on the set of parameters typically available for structural stainless steels in Europe (0.2% and 1.0% proof strength and ultimate strength) and compared to the existing models by curve-fitting of analytical equations to measured stresses and strains of austenitic, duplex and ferritic stainless steels. The comparisons clearly showed that this three-stage application of the generalized multistage model yields more accurate results compared to the existing material models both in its direct and inverse form.
Original languageEnglish
Pages (from-to)63-69
JournalThin-Walled Structures
Volume63
DOIs
Publication statusPublished - Feb 2013
MoE publication typeA1 Journal article-refereed

Fingerprint

Stainless steel
Ferritic steel
Curve fitting
Strain hardening
Corrosion resistance
Durability
Testing

Keywords

  • stainless steel
  • nonliear
  • strain hardening
  • material model
  • generalization

Cite this

Hradil, Petr ; Talja, Asko ; Real, Esther ; Mirambell, Enrique ; Rossi, Barbara. / Generalized multistage mechanical model for nonlinear metallic materials. In: Thin-Walled Structures. 2013 ; Vol. 63. pp. 63-69.
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Generalized multistage mechanical model for nonlinear metallic materials. / Hradil, Petr (Corresponding Author); Talja, Asko; Real, Esther; Mirambell, Enrique; Rossi, Barbara.

In: Thin-Walled Structures, Vol. 63, 02.2013, p. 63-69.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - Generalized multistage mechanical model for nonlinear metallic materials

AU - Hradil, Petr

AU - Talja, Asko

AU - Real, Esther

AU - Mirambell, Enrique

AU - Rossi, Barbara

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N2 - Metallic alloys have a significant role in thin-walled engineering structures due to their unique properties such as corrosion resistance, low density or durability. Their mechanical behaviour is usually nonlinear, and this nonlinearity can be further increased during the work-hardening process. In such cases, designers have to take the proper stress–strain relationship into account to obtain reliable prediction of deformations or internal forces. In this paper, a theoretical model is proposed to match different kinds of measured data or already existing stress–strain models. It is flexible to accommodate any number of measured or recommended material parameters, and therefore makes design rules independent on testing standards. It is particularly suitable for computer code implementation. The approximate inversion of the multistage model is also included in the presented study. The general formula is applied on the set of parameters typically available for structural stainless steels in Europe (0.2% and 1.0% proof strength and ultimate strength) and compared to the existing models by curve-fitting of analytical equations to measured stresses and strains of austenitic, duplex and ferritic stainless steels. The comparisons clearly showed that this three-stage application of the generalized multistage model yields more accurate results compared to the existing material models both in its direct and inverse form.

AB - Metallic alloys have a significant role in thin-walled engineering structures due to their unique properties such as corrosion resistance, low density or durability. Their mechanical behaviour is usually nonlinear, and this nonlinearity can be further increased during the work-hardening process. In such cases, designers have to take the proper stress–strain relationship into account to obtain reliable prediction of deformations or internal forces. In this paper, a theoretical model is proposed to match different kinds of measured data or already existing stress–strain models. It is flexible to accommodate any number of measured or recommended material parameters, and therefore makes design rules independent on testing standards. It is particularly suitable for computer code implementation. The approximate inversion of the multistage model is also included in the presented study. The general formula is applied on the set of parameters typically available for structural stainless steels in Europe (0.2% and 1.0% proof strength and ultimate strength) and compared to the existing models by curve-fitting of analytical equations to measured stresses and strains of austenitic, duplex and ferritic stainless steels. The comparisons clearly showed that this three-stage application of the generalized multistage model yields more accurate results compared to the existing material models both in its direct and inverse form.

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