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Analysis of stress state and failure in test specimens used for determination of fracture-mechanical parameters of quasi-brittle materials

By Táňa Holušová


The thesis is focused on a test on determination of the fracture-mechanical parameters of quasi-brittle materials, especially concrete. What is referred to as the wedge-splitting test is considered, for which a variety of shapes of notched specimen can be used. This work is exclusively focused on the cylinder-shaped specimen of diameter 150 mm and breadth of 100 mm. The test is performed virtually using Atena 2D FEM software. Progress of failure is observed during loading of the specimen for various notch lengths. The amount of energy released for the development the failure outside of the tested cross-sectional area (weakened by the notch) is quantified and the size of the fracture process zone is investigated. The described analysis is performed for several material sets witch differ in cohesive properties of the quasi-brittle material expressed via the so-called characteristic length. Suitable proportions of the test specimen are sought, in order to avoid the failure and thus also the energy dissipation outside of the specimen ligament area during the experimental tests, which shall lead to more accurate estimates of fracture-mechanical parameters of the tested material

Topics: characteristic length; finite element method (FEM); relativní délka zářezu; fracture process zone; work of fracture; lomová procesní zóna; Wedge-splitting test; fracture energy; cylinder-shaped specimen; lomová práce; Zkouška štípáním klínem; relative notch length; cementitious composites; válcové těleso; metoda konečných prvků (MKP); cementové kompozity; lomová energie; charakteristická délka
Publisher: Vysoké učení technické v Brně. Fakulta stavební
Year: 2012
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