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Strain Rate Dependences of Dynamic Fracture Toughness and Fracture Energy of Rocks

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Abstract

This paper considers dynamic rock fracture from the viewpoint of the force and energy limiting criteria formulated from the concepts of the structural-temporal approach. For each limiting criterion set at a given fracture time, the incubation time is calculated as a key constant material characteristic within the proposed approach which depends on the scale and is the main measure of the material response. Experimental literature data on three-point bending are used to discuss the strain rate dependences of rock fracture toughness with varying specimen notch length and fracture work. Using the dynamic fracture of coal and granite as an example, it is shown that the incubation time determined by the force criterion is independent of the specimen notch length. Comparison is made of the marble incubation times obtained from the strain rate dependences of fracture toughness and fracture work.

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Funding

The work was supported by the Russian Foundation for Basic Research (Projects Nos. 21-51-53008, 20-01-00291) and RF President Grant for young scientists MK-78.2021.1.1.

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Authors and Affiliations

  1. Saint Petersburg University, 198504, Saint Petersburg, Russia

    N. S. Selyutina

  2. Institute for Problems in Mechanical Engineering, Russian Academy of Sciences, 199178, Saint Petersburg, Russia

    N. S. Selyutina

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  1. N. S. Selyutina
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Correspondence to N. S. Selyutina.

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Translated from Fizicheskaya Mezomekhanika, 2022, Vol. 25, No. 2, pp. 101–108.

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Selyutina, N.S. Strain Rate Dependences of Dynamic Fracture Toughness and Fracture Energy of Rocks. Phys Mesomech 25, 366–372 (2022). https://doi.org/10.1134/S1029959922040105

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