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A model for the progressive failure of composite materials that considers the materials' non-linearity was developed and implemented with the Abaqus FE software. An extended Puck failure criterion for the 3D stress state was used for the failure prediction. Furthermore, a simplified approach for the simulation of the delamination was considered. For the progressive failure simulation, the stiffness matrix degradation was used and the degradation parameters were a function of the fracture angle. The model was tested on problems of a pin-loaded composite plate and of a composite tube subjected to compressive loading perpendicular to the tube axis. Keywords: progressive failure, composite, Puck criterion, finite-element analysis Razvit je bil model postopnega popu{~anja kompozitnega materiala z upo{tevanjem nelinearnosti materiala, ki je bil uporabljen v Abaqus FE programski opremi. Raz{irjeni Puckov kriterij poru{itve za tridimenzionalno napetostno stanje je bil uporabljen za napoved poru{itve. Poleg tega je bil uporabljen tudi poenostavljen pribli`ek za simulacijo delaminacije. Za simulacijo napredovanja popu{~anja je bila uporabljena degradacija togosti matrice. Degradacijski parametri pa so bili funkcija kota poru{itve. Model je bil preizku{en na problemu obremenjevanja kompozitne plo{~e s konico in kompozitne cevi, izpostavljene tla~ni obremenitvi pravokotno na os cevi. Klju~ne besede: postopno popu{~anje, kompozit, Puckov kriterij, analiza kon~nih elementov

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Different carbon and glass fibre strips were subjected to the double clamp buckle beam test. Furthermore, thin-walled glass fibre box-beams were subjected to the three-point bending test. Results of experiments were compared to different numerical simulations using buckling analysis or static analysis considering large deformations.

This paper deals with the failure analysis of a carbon fibre reinforced plastic (CFRP) plate which is joined to a structure using a steel pin. The analysis was carried out experimentally and numerically using the finite element method (FEM) system MSC.Marc. The Puck´s failure criterion for 3D stress state was used after its implementation into the MSC.Marc system. Experimental specimens were symmetrical laminates with 8 layers. A special experimental device which allowed monitoring of all visible changes of the experimental specimens with cameras was designed. This device was installed into the testing machine Zwick/Roell Z050. Obtained images were evaluated using the digital image correlation technique. Moreover, the vibrations in the surroundings of the specimens were measured to detect acoustic emissions which occur during damage.