Journal
THEORETICAL AND APPLIED FRACTURE MECHANICS
Volume 97, Issue -, Pages 419-425Publisher
ELSEVIER
DOI: 10.1016/j.tafmec.2017.07.004
Keywords
Average strain energy density criterion; Local approach; Granite rock; Brittle fracture; Mixed mode I/II; Fracture load prediction
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Mixed mode brittle fracture behaviour of granite rock is studied experimentally and theoretically using Asymmetric Four Point Bend (AFPB) specimens containing pre-cracks subjected to different mixed mode loading conditions, ranging from pure mode Ito pure mode II. The main aim of this paper is twofold. First, to present a complete set of experimental results on fracture of pre-cracked granite samples under various in-plane loading mixities, and second, to predict the fracture loads of the tested rock samples under mixed mode conditions using an energy-based criterion, namely the Average Strain Energy Density (ASED) criterion. Good agreement is found between the experimentally obtained fracture loads and the theoretical predictions based on the constancy of the mean strain energy density over the material volume. It is shown that the ASED criterion is able to provide well predictions for the fracture loads of the investigated rock material containing a pre-crack. (C) 2017 Elsevier Ltd. All rights reserved.
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