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

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  • Liu, Haizhou
  • Mao, Lingtao
  • Ju, Yang
  • Hild, François

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.

Suggested Citation

  • Liu, Haizhou & Mao, Lingtao & Ju, Yang & Hild, François, 2023. "Damage evolution in coal under different loading modes using advanced digital volume correlation based on X-ray computed tomography," Energy, Elsevier, vol. 275(C).
    • Handle: RePEc:eee:energy:v:275:y:2023:i:c:s0360544223008411
    DOI: 10.1016/j.energy.2023.127447
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    References listed on IDEAS

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    1. Sun, Lulu & Zhang, Chen & Wang, Gang & Huang, Qiming & Shi, Quanlin, 2022. "Research on the evolution of pore and fracture structures during spontaneous combustion of coal based on CT 3D reconstruction," Energy, Elsevier, vol. 260(C).
    2. Yongzan, Wen & Guanhua, Ni & Xinyue, Zhang & Yicheng, Zheng & Gang, Wang & Zhenyang, Wang & Qiming, Huang, 2023. "Fine characterization of pore structure of acidified anthracite based on liquid intrusion method and Micro-CT," Energy, Elsevier, vol. 263(PA).
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