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Mode I and mixed mode fracture studies in brittle materials using the Brazilian disc specimen

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Abstract

High Strength Cement Mortar (HSCM) with very fine sand exhibits a typical brittle behavior. In the present work, a linear elastic fracture mechanics based model is used for the fracture studies conducted on this material. The experimental testing program is based on the diametral compression test of disc specimens containing an internal slant crack. Under the Mode I loading condition, the test method which has been previously used is applied to determine the critical value of the stress intensity factor, KIC, for HSCM. The same dise specimen is also tested under combined Mode I and Mode II loading conditions. By changing the notch orientation angle with respect to the loading direction, the mode of fracture is varied from pure Mode I to Mixed-Mode. Based on the Mixed-Mode fracture envelope, it is shown that the disc specimen which is currently used for several brittle materials provides a wide range of |KII|/K1 ratios. In pure Mode I loading case, after determining KIC, it is possible to obtain the graph of normalized critical load versus normalized crack length. For the purpose of comparison, some available experimental data on Mode I and/or Mixed Mode fracture of some other brittle materials such as glass, sintered carbide, and polymethyl methacrylate (PMMA) were also evaluated. It can be concluded that there is a good fit between the experimental results and the theory.

Résumé

Les mortiers à très haute résistance (MTHR) préparés avec du sable très fin ont exhibité un comportement typiquement fragile. Dans cet article un modèle de rupture élastique linéaire est utilisé pour étudier la rupture de ces matériaux. L'étude expérimentale consistait des essait des consistait des essais de compression diamétrale sur des éprouvettes en forme de disques contenant une fissure inclinée. Les essais conformes au Mode I utilisés auparavant sont appliqués pour déterminer la valeur critique du facteur d'intensité de la contrainte KIC du MTHR. Les mêmes éprouvettes ont été ensuite essayées sous charge combinée du Mode I et Mode II. En changeant l'angle d'orientation de l'entaille par rapport à la direction de la force appliquée, le mode de rupture a été modifié du Mode I au Mode-Mixte. En se servant de l'enveloppe du Mode-Mixte de rupture, utilisée actuellement on a montré que l'éprouvette disque pouvait fournir une large pour les rapports |KII|/K1. Au cas de chargement simple de Mode I, après avoir déterminé KIC il était possible d'obtenir un graphique entre la charge critique et la longueur de la fissure normalisées. D'autres résultats expérimentaux obtenus sur d'autres matériaux fragiles comme verre, carbide synthérisé et méthacrylate de polymethyl (PMMA) sont aussi évalués afin de réaliser une comparaison. On peut conclure qu'il existe une bonne conformité entre les résultats expérimentaux et théoriques.

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Authors and Affiliations

  1. Civil Engineering Faculty, Istanbul Technical University, 34469, Maslak Istanbul, Turkey

    H. N. Atahan, M. A. Tasdemir, C. Tasdemir, N. Ozyurt & S. Akyuz

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  1. H. N. Atahan
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  2. M. A. Tasdemir
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  3. C. Tasdemir
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  4. N. Ozyurt
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  5. S. Akyuz
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Atahan, H.N., Tasdemir, M.A., Tasdemir, C. et al. Mode I and mixed mode fracture studies in brittle materials using the Brazilian disc specimen. Mat. Struct. 38, 305–312 (2005). https://doi.org/10.1007/BF02479295

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