Damage evolution in coal under different loading modes using advanced digital volume correlation based on X-ray computed tomography

Haizhou Liu, Lingtao Mao, Yang Ju and François Hild

Energy, 2023, vol. 275, issue C

Abstract: To investigate the damage development of coal under different loading conditions, in-situ tests in uniaxial and triaxial compression were carried out. Advanced digital volume correlation based on finite element discretization was utilized to quantify the three-dimensional initial and newborn fractures. With this technique, the low contrast in the coal images was compensated for by mechanical regularization, and the fracture activities were quantified via a damage variable and mesh refinement scheme, including fracture opening/closure displacements, volume fractions of damaged elements, and fractal dimensions. The experiments revealed that the damage growth in coal was substantially affected by randomly distributed initial defects. Prior to a macroscopic failure, the coal samples generally experienced pre-existing fracture closure, newborn fracture initiation, interaction and propagation of the two fracture types. This study aimed to gain in-depth insights into the bulk fracture of coal and provide quantitative evidence for further understanding the damage mechanisms from the microscale to the macroscale.

Keywords: Damage; Coal; Compression; Digital volume correlation; X-ray computed tomography (search for similar items in EconPapers)
Date: 2023
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Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:275:y:2023:i:c:s0360544223008411

DOI: 10.1016/j.energy.2023.127447

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