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Experimental and numerical analysis of indirect and direct tensile strength using fracture mechanics concepts

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Abstract

Brazilian tests were conducted on an isotropic limestone with different length-to-diameter ratios and various bearing strip widths. The direct tensile strength of the rock specimens was also obtained using direct tension test apparatus and a servo-control testing machine. The Brazilian test was modeled using the computer program (Abaqus 6.7-1) and both smeared rotating crack and cohesive crack models were selected for the analysis of crack propagation. Comparison of the experimental and numerical analyses showed that the results from the smeared rotating crack model were closer to the experimental results than those from the cohesive crack model. Appropriate testing conditions for the Brazilian test are proposed, in order to achieve the results closest to the direct tension test.

Résumé

Des essais brésiliens ont été réalisés sur des calcaires isotropes avec différents ratios longueur/diamètre et différentes largeurs de bandes d’application de la charge. La résistance à la traction directe des échantillons a été aussi obtenue grâce à des essais de traction directe réalisés avec une machine d’essais asservie. L’essai brésilien a été modélisé avec le logiciel Abaqus 6.7-1, utilisant un modèle à fissuration distribuée et un modèle à fissures cohésives. La comparaison entre les résultats expérimentaux et les analyses numériques a montré que le modèle à fissuration distribuée rendait mieux compte des résultats expérimentaux que le modèle à fissures cohésives. Des conditions d’essai appropriées ont été proposées pour l’essai brésilien afin rapprocher les résultats de cet essai de ceux de l’essai de traction directe.

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Authors and Affiliations

  1. Department of Civil and Environmental Engineering, Amirkabir University of Technology, Tehran, Iran

    A. Fahimifar & M. Malekpour

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  1. A. Fahimifar
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  2. M. Malekpour
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Correspondence to M. Malekpour.

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Fahimifar, A., Malekpour, M. Experimental and numerical analysis of indirect and direct tensile strength using fracture mechanics concepts. Bull Eng Geol Environ 71, 269–283 (2012). https://doi.org/10.1007/s10064-011-0402-7

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  • DOI: https://doi.org/10.1007/s10064-011-0402-7

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