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	3D modelling of dislocation processes Záležák, Tomáš Article presents a 3D model which describes a motion of discrete dislocations in a crystalline material at high temperatures. The dislocation curves are represented by straight line segments. The driving forces are determined by a Peach-Koehler formula which considers the self-stress and applied stress. The segment velocity is approximated by a temperature-dependent linear relation to the Peach-Koehler force. The model incorporates spherical precipitates. The model is also capable of adaptive adjustment of a time integration step and remeshing of the straight segment network. Topological changes (i. e. annihilation) are also included. The numerical integration takes advantage of the model symmetry to speed up the simulation process, save computer memory and reduce numerical errors. The model is applied to a system of coaxial dislocation loops in a field of spherical particles. Detailed record
	Two-layer pipe - the influence of materials interface on creep crack behaviour Zouhar, Michal ; Hutař, Pavel ; Náhlík, Luboš Nowadays the using of layered structures is increasing. The aim of this article is study the influence of material interface of two layer pipe with inner crack on the crack behaviour. The numerical model of two layer pipe was created and the creep crack growth was modelled (taking into account realistic crack shape evolution). The results of two layer pipe were compared with homogenous approximation and accuracy of the lifetime prediction was discussed. Detailed record
	Influence of point load on crack shape in polymeric pipe Ševčík, Martin ; Hutař, Pavel ; Náhlík, Luboš ; Pinter, G. ; Frank, A. The aim of this work was to develop an easy applicable algorithm of numerical model creation simulating a cracked polymeric pipe under various combination of loading. Proposed algorithm is able to find a real crack front shape using iterative procedure. The main aim was to study the effect of the point load and its consequences on the crack front shape. It was numerically confirmed that point loading causes grater crack extension in axial direction than in the case of pipe loaded by pure inner pressure. This results leads to higher stress intensity factor and lower residual life-time of the pipe system. Detailed record
	Constraint effect on values of fracture toughness in sub-sized three point bending geometry Stratil, Luděk ; Hadraba, Hynek ; Dlouhý, Ivo This contribution briefly describes testing performance of sub-sized three point bending specimen type KLST. The KLST specimens suffer significant the loss of constraint. Side grooving is necessary to obtain additional level of the constraint and to maintain straight crack front. Methodology for testing of the fracture toughness in ductile-to-brittle and ductile area is also described. In certain testing conditions KLST specimens shows results comparable with standard test specimens. Detailed record

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