This paper presents an improved analytical calculation model for unstiffened elements with nonlinear stress‐strain relationships (e.g. aluminium and stainless steel) subjected to uniform in‐plane compression. The model takes material nonlinearity into account by means of the Ramberg‐Osgood constitutive law. It is based on the results of a numerical parametric study of the load‐carrying behaviour of unstiffened elements. A comparative study shows good agreement between test results and analytically determined strengths according to the new calculation model.

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