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The research leading to these results has received funding from the commissioned task entitled “VIA CARPATIA Universities of Technology Network named after the President of the Republic of Poland Lech Kaczyński” contract no. MEiN/2022/DPI/2575 action entitled “In the neighborhood – inter-university research internships and study visits.”
The purpose of the study was to conduct an experimental-numerical analysis of the critical state (buckling) of
thin-walled composite structures with a square cross-section. The subject of the study was thin-walled com-
posite structures, which were made of CFRP – carbon epoxy composite. The structures were characterized by
a closed square cross-sectional shape. In the research paper, stability tests of axially compressed thin-walled
struts were performed in order to determine the critical state of the structures. Experimental tests were carried
out on a universal testing machine, using a system for optical measurement of deformation of structures. Nu-
merical simulations were carried out using the finite element method (FEM). The research made it possible to
evaluate the work of the structure in the buckling state from a qualitative as well as quantitative point of view.
During the study, the buckling form and the corresponding critical load were determined – which quantitatively
and qualitatively showed high agreement for both experimental testing and numerical simulation. The novelty
of the present paper was the use of several interdisciplinary research methods (testing machine, optical defor-
mation measurement system and numerical simulations) in order to determine the critical state of thin-walled
composite structures with closed sections.
