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	Concrete as a two-phase material: statistical/sensitivity modelling of failure Keršner, Z. ; Náhlík, Luboš ; Knésl, Zdeněk Concrete is represented as a two-phase material. Behaviour of a crack with its tip on the interface between two different materials ů hardened cement paste (matrix) and aggregate(particle) ů is modelled. Input variables of the model are considered as random variables using LHS method/FREET software. Then results of statistical/sensitivity analyses of output variable ů the critical stress for the intersection of coarse aggregate particle ů are presented. Detailed record
	Fracture behaviour of the short crack near the stress concentrator Hutař, Pavel ; Knésl, Zdeněk A two-parameter fracture mechanics method is applied to small cracks near a stress concentrator. The small crack in the present contribution is considered as crack influenced by the stress concentrator. The sharp V-noch or V-noch with radius $R$ are studieded here. The effect of V-notch geometry on the small crack fracture parameters is analysed. The necessary calculations are performed by using a finite element method (system Ansys). Obtained results are discussed from point of view of the small crack behavior. The small fatigue crack growth is especially influenced by the constraint level. The results improve the quality of fatigue life estimation of structure with concentrators. Detailed record
	Influence of constraint effect on transferability of fracture mechanics characteristics Vlček, Libor ; Kozák, Vladislav This paper presents the consideration on the change judgement of J integral and Q parameter as the base parameters of two parameter elastic-plastic fracture mechanics. An extensive 3D FEM analysis of SE(B) specimens deals with crack front conditions which are characterised in J-Q trajectories. Detailed record

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