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The objective of this study was to investigate the influence of matrix couplings on the buckling,post-buckling and load-carrying capacity of thin-walled composite plates weakned by cut-out. TheCFRP plates were manufactured by the autoclave technique. The scope of the study involved performingexperimental tests on real structures as well as numerical calculations by the finite element method. Theexperimental tests were conducted in the full range of loading, until the structure’s failure. Post-bucklingequilibrium paths and acoustic emission signals were measured in order to determine actual condition ofthe composite material. Non-linear numerical calculations were carried out using the Newton-Raphsonincremental iterative method. The numerical simulations were performed using the commercial softwareABAQUS®. High compatibility of numerical calculations with the results of experimental studies hasbeen obtained, which confirms the adequacy of the developed numerical models. Research funding:Results presented in the paper was conducted under the project UMO-2017/25/N/ST8/01066 financedby the National Science Centre Poland. The project/research was financed in the framework of theproject Lublin University of Technology-Regional Excellence Initiative, funded by the Polish Ministry ofScience and Higher Education (contract no. 030/RID/2018/19).
