The effect of indentation sequence on rock breakages: A study based on laboratory and numerical tests

Jie Liu; Jun Wang

doi:10.1016/j.crme.2017.11.004

The effect of indentation sequence on rock breakages: A study based on laboratory and numerical tests

Jie Liu ^1,² ; Jun Wang ¹

¹ Department of Building Engineering, Hunan Institute of Engineering, Xiangtan, China
² School of Resource, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, Hunan, China

Comptes Rendus. Mécanique, Volume 346 (2018) no. 1, pp. 26-38.

Résumé

Rock may response differently to external loads applied in different sequences. Thus, we conducted indentation tests to investigate the effect of the indentation sequence on rock breakages. Sequential indentations, consuming less indentation energy, usually resulted in larger and deeper grooves and then led to lower specific energies. Thus, we conclude that sequential indentations occur instead of simultaneous indentations form larger grooves with the same indentation energy. To further validate this conclusion, we performed a series of numerical tests. The numerical analysis of stress evolution shows that, for simultaneous indentations, the propagation of an internal crack from an inner rim restrained the propagation of the other internal crack from the other inner rim. However, the chipping pattern varied for sequential indentations. In the first indentation process, an internal crack, initiating from an inner rim, is usually connected with an internal crack caused by the second indentation. The deflection angles of the internal cracks for the sequential indentations were smaller because of the lower compressive stress in the horizontal direction. Then, these smaller deflection angles led to larger chips.

Reçu le : 2017-06-18
Accepté le : 2017-11-14
Publié le : 2017-11-28

DOI : 10.1016/j.crme.2017.11.004

Mots-clés : Indentation sequence, Crack propagation, Stress evolution, Indentation efficiency

Affiliations des auteurs :

Jie Liu ^{1, 2} ; Jun Wang ¹

¹ Department of Building Engineering, Hunan Institute of Engineering, Xiangtan, China
² School of Resource, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, Hunan, China

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     author = {Jie Liu and Jun Wang},
     title = {The effect of indentation sequence on rock breakages: {A} study based on laboratory and numerical tests},
     journal = {Comptes Rendus. M\'ecanique},
     pages = {26--38},
     publisher = {Elsevier},
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     year = {2018},
     doi = {10.1016/j.crme.2017.11.004},
     language = {en},
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Jie Liu; Jun Wang. The effect of indentation sequence on rock breakages: A study based on laboratory and numerical tests. Comptes Rendus. Mécanique, Volume 346 (2018) no. 1, pp. 26-38. doi : 10.1016/j.crme.2017.11.004. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2017.11.004/

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