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The paper analyzes the stability and failure phenomenon of compressed thin-walled composite
plate element weakened by cut-out. Tested elements were made of carbon fiber reinforced polymer
(CFRP) composite material (using the autoclave technique). An experimental study on actual structures
and numerical calculations on computational models using the finite element method was performed.
During the experimental study, post-critical equilibrium paths were registered with acoustic emission
signals, in order to register the damage phenomenon. Simultaneously to the experimental tests, nu-
merical simulations were performed using progressive failure analysis (PFA) and cohesive zone model
(CZM). A significant effect of conducted numerical calculations was the simulation of the failure phe-
nomenon of thin-walled composite structures, in terms of loss of load-carrying capacity, using three in-
dependent damage models (model PFA, CZM and xFEM). The above constitutes a novelty, with respect
to current papers from the subject literature. The use of the above-mentioned techniques of experi-
mental research and numerical simulations made it possible to conduct a comprehensive analysis of
the damage state of the composite material. The obtained results o
