"3"^^ . "0"^^ . . "0"^^ . . "674839" . "RIV/00216305:26110/01:PU23225!RIV/2003/GA0/261103/N" . . "ELSEVIER SCIENCE Ltd." . "Calculation of the critical stress in two-phase materials"@en . . "Calculation of the critical stress in two-phase materials"@en . "Structural Engineering, Mechanics and Computation" . . "26110" . "Calculation of the critical stress in two-phase materials" . "Calculation of the critical stress in two-phase materials" . "Ker\u0161ner, Zbyn\u011Bk" . . "P(GV103/97/K003), P(KSK1076602), Z(AV0Z2041904)" . . . "2001-04-02+02:00"^^ . . "0-08-043948-9" . . "One of the primary reasons for the observed deviation of the behaviour of concrete from predictions based on linear elastic fracture mechanics can be the interaction between a crack and a material inhomogeneity such as a particle which necessarily exists in such a material. In this paper, concrete is modelled as a two-phase material and the behaviour of a crack with its tip on the interface between two different materials is studied. In contrast to cracks in homogeneous materials the stress singularity for a crack terminating at the interface is of the type r exp -lambda, where the value of the stress singularity exponent, lambda, is in the interval 0 < lambda < 1. This means that classical fracture mechanics theory and criterion cannot be applied. In the paper a new stability criterion is formulated. Conditions for the stability of the crack terminating at the interface between two materials are then used to estimate the critical stress for the intersection of coarse aggregate particles. It is shown"@en . "[0315B1541937]" . . . . . "RIV/00216305:26110/01:PU23225" . "737-744" . "Cape Town" . . . . "One of the primary reasons for the observed deviation of the behaviour of concrete from predictions based on linear elastic fracture mechanics can be the interaction between a crack and a material inhomogeneity such as a particle which necessarily exists in such a material. In this paper, concrete is modelled as a two-phase material and the behaviour of a crack with its tip on the interface between two different materials is studied. In contrast to cracks in homogeneous materials the stress singularity for a crack terminating at the interface is of the type r exp -lambda, where the value of the stress singularity exponent, lambda, is in the interval 0 < lambda < 1. This means that classical fracture mechanics theory and criterion cannot be applied. In the paper a new stability criterion is formulated. Conditions for the stability of the crack terminating at the interface between two materials are then used to estimate the critical stress for the intersection of coarse aggregate particles. It is shown" . "8"^^ . "N\u00E1hl\u00EDk, Lubo\u0161" . "aggregate, cement paste, concrete, critical stress, elastic mismatch, finite element method, fracture mechanics, mortar, two-phase material"@en . . . . . "Amsterdam" . . "Kn\u00E9sl, Zden\u011Bk" . . . . . "2"^^ .