One of the weakest points in concrete dams occurs at the rock/concrete interfaces at the base of the dam. This has prompted interest in studying the interface laws that can best represent the interaction between damage due to normal stresses and damage caused by tangential stresses (traction-separation law) in the process zone, within the framework of the cohesive crack model. Karihaloo and Xiao [1] proposed considering the Coulomb friction between the crack faces, instead of a tangential cohesive relationship. This model is called the cohesive-frictional crack model,and it is different from the model of frictional contact of crack faces, because the friction operates when the crack faces are open. In their paper,the above mentioned authors published an asymptotic expansion of a crack propagating along a joint between homogeneous materials. In the present paper, a new asymptotic expansion is presented and applied for the case of a crack propagating at a bi-material interface.

Mixed mode cohesive crack growth at the bi-material interface between a dam and foundation joint / Alberto, Andrea; Valente, Silvio. - STAMPA. - (2012). (Intervento presentato al convegno Crack Path tenutosi a Gaeta nel 19-21 September 2012).

Mixed mode cohesive crack growth at the bi-material interface between a dam and foundation joint

ALBERTO, ANDREA;VALENTE, Silvio
2012

Abstract

One of the weakest points in concrete dams occurs at the rock/concrete interfaces at the base of the dam. This has prompted interest in studying the interface laws that can best represent the interaction between damage due to normal stresses and damage caused by tangential stresses (traction-separation law) in the process zone, within the framework of the cohesive crack model. Karihaloo and Xiao [1] proposed considering the Coulomb friction between the crack faces, instead of a tangential cohesive relationship. This model is called the cohesive-frictional crack model,and it is different from the model of frictional contact of crack faces, because the friction operates when the crack faces are open. In their paper,the above mentioned authors published an asymptotic expansion of a crack propagating along a joint between homogeneous materials. In the present paper, a new asymptotic expansion is presented and applied for the case of a crack propagating at a bi-material interface.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2502596
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