期刊
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
卷 46, 期 2, 页码 346-354出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijrmms.2008.07.004
关键词
Rock fracture mechanics; Mixed-mode loading; Finite element analysis; Arcan test specimen; Scanning electron microscopy
This study presents an application of fracture mechanics to determine mixed-mode fracture properties of rock using the numerical and experimental methods. The modified version of Arcan specimen test was, in association with a special loading device, an appropriate apparatus for experimental mixed-mode fracture analysis. Using the finite-element results, correction factors were applied to the specimens and a polynomial fit was proposed to evaluate the stress-intensity factors of a modified version of Arcan specimen with a crack subjected to mixed mode loading. The finite element analyses of specimens were also studied for various materials, different thickness and crack length. The mixed-mod fracture-toughness tests were carried out by using the modified Arcan test specimens over a wide range of loading angles. Using the finite element results, non-dimensional stress-intensity factors applied to the fracture specimen. By employing experimentally measured critical loads and the aid of the finite element method, mixed-mode fracture toughness for rock under consideration determined. The fracture surfaces under different mixed-mode loading conditions were examined by optical and scanning electron microscopy (SEM) to gain insight into the failure surfaces. (C) 2008 Elsevier Ltd. All rights reserved.
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