The linear elastic fracture mechanics and the cohesive crack model in predicting the fracturing of rocks / A mecânica da fratura elástica linear e o modelo coesivo na previsão do fraturamento de rochas

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

22/08/1997

RESUMO

This present work has been developed aiming to verify the scale effect influence on the stress-strain curve form as well on the strength of two Brazilian rocks: Botucatu sandstone and basalt from Serra Geral Formation. Using samples of those rocks three point beam bending experiments have been made in with the crack displacement opening mouth was controlled. The experiments have been conducted using four different samples size. In the experiments no variation in the form of the force-displacement curve has been observed considering those chosen samples sizes. The rock strength variation for those samples is approximately the one predicted by the Linear Elastic Fracture Mechanics Theory. The force-displacement curves experimentally achieved were compared with two other curves obtained numerically, one using the Linear Elastic Fracture Mechanics Theory with FEM and other assuming the fictitious Cohesive Crack Model with BEM. It has been verified that among the two numerical procedures the Cohesive Crack Model gives better results and both give smaller displacements after the rupture.

ASSUNTO(S)

rocha fratura fracture ensaio experiment rock

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