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CRACK CLOSURE AND INITIATION STRESSES OF COAL SUBJECTED TO THERMO-GAS-MECHANICAL COUPLING

ABSTRACT
In this paper, the orthogonal experiment method is employed to design physical tests of coal under different temperatures, confining pressures, and gas pressures. The crack closure stress and crack initiation stress are calculated using four known methods, i. e. axial strain method, axial stiffness method, crack volume method, and strain response method. The obtained results are compared, and the advantages and drawbacks for the used methods are also discussed. The influences of the three factors on the crack closure and crack initiation stresses are analyzed.
KEYWORDS
PAPER SUBMITTED: 2017-02-10
PAPER REVISED: 2017-05-10
PAPER ACCEPTED: 2017-05-16
PUBLISHED ONLINE: 2017-12-02
DOI REFERENCE: https://doi.org/10.2298/TSCI17S1301G
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2017, VOLUME 21, ISSUE Supplement 1, PAGES [S301 - S308]
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© 2017 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence