National Repository of Grey Literature 17 records found  previous11 - 17  jump to record: Search took 0.00 seconds. 
Kritérium stability bi-materiálového vrubu se dvěma singularitami
Klusák, Jan
Interfaces with a step change of material properties occur often in technical constructions. In combination with a sharp notch it usually leads to singular stress distribution in a vicinity of such a wedge. The existence of two singularities seems to be the main problem within study of this stress concentrator. The other problem is that each singularity does not correspond to particular mode of loading. The presented contribution studies stress distribution in a bi-material wedge vicinity and shows a method of solution of the problems in case of existence of multiple stress singularity
Modelling of two-phases materials: the influence of shape and size of paticles
Náhlík, Luboš ; Keršner, Z. ; Knésl, Zdeněk
Concrete is modelled as a two-phase material in this paper. Behaviour of a crack ith its tip on the interface between two different materials - hardened cement paste (matrix) and aggregate (particle) - is studied. In contrast to cracks in homogeneous materials the stress singularity for a crack terminating at the interface is of the type r
Modeling of specific cathegory of bi-material bodies with respect to fracture mechanics\' problems solution
Bareš, Pavel
Paper deal with numerical calculation problems of crack terminating throught an interface between two elastic identical materials with different yield stresses. Calculations are based on finite element method. Crack behaviour is described here by means of crack tip opening displacement CTOD assessed as a translation vector component on the 4. node from the crack tip lies on the crack face when the eight-node elements are used.
Vliv rozhraní mezí matricí a inkluzí na šíření únavových trhlin
Náhlík, Luboš
The interaction between an inhomogeneity and a crack propagating near the circular inhomogeneity is studied under the assumptions of linear elastic fracture mechanics (LEFM). Three cases are considered: a crack located in front of the inhomogeneity, a crack situated arbitrarily near the inhomogeneity, and a special case when the crack tip lies at the interface between the matrix and the inhomogeneity. The main purpose of this paper is to find the most often configurations in materials with inhomogeneities
Modelling of crack propagation through bi-material interface
Náhlík, Luboš
Under conditions of Linear Elastic Fracture Mechanics is studied crack behaviour in front of circular particle. The typical behaviour of crack approaching the interface between matrix and particle is showen. Results of numerical calculations and applications of earlier suggested tentative fracture criteria for crack terminating at the bi-material interface are presented.
Interaction between crack and circular inclusion
Náhlík, Luboš
The interaction between an inhomogeneity and a crack propagating near the circular inhomogeneity is studied under the assumptions of linear elastic fracture mechanics (LEFM) (we assume elastic behaviour of the matrix and the inhomogeneity as well). Three cases are considered: a crack located in front of the inhomogeneity, a crack situated arbitrarily near the inhomogeneity, and a special case when the crack tip lies at the interface between the matrix and the inhomogeneity . The main purpose of this paper is to find the most often configurations in materials with inhomogeneities.
Analysis of a crack groving through an interface of two different materials based on crack tip opening displacement
Bareš, Pavel ; Knésl, Zdeněk
Paper describes a study of a crack penetrating the interface between two different elastic materials. The conditions of stability of a crack terminating at the interface are formulated. It is supposed that crack stability is controlled by the corresponding value of the crack tip opening displacement. The resulting critical stresses are compared with those obtained by other approaches. Numerical calculations are performed by finite element method (system ANSYS).

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