Abstract
The regularities of deformation and fracture of sandstone under nonproportional biaxial and triaxial cyclic compression accompanied by the rotation of the Lamé ellipsoid and in situ continuous detection of acoustic emission are investigated experimentally on the “Triaxial Independent Loading Test System” at the Ishlinskii Institute for Problems in Mechanics, Russian Academy of Sciences. It is found that the manifestation of the Kaiser effect in the current cycle of multiaxial nonproportional compression depends on the behavior of the size, shape, and orientation of the Lamé ellipsoid with respect to the previous cycle. The Kaiser effect is observed in the case when the material has already been subjected to active loading corresponding to the set orientation of the stress ellipsoid. The degree of the specified-effect manifestation is determined by the behavior of the shape of the Lamé ellipsoid.
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Funding
These experimental investigations of the biaxial nonproportional compression of sandstone were carried out within the framework of a State Assignment, project no. AAAA-A19-119013090021-5, and those on triaxial nonproportional compression, according to a State Assignment of the Ministry of Education and Science of Russia, project no. FSNM-2020-0027 for fundamental scientific research for 2020 and the planning period of 2021 and 2022.
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Translated by V. Bukhanov
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Panteleev, I.A., Mubassarova, V.A., Zaitsev, A.V. et al. The Kaiser Effect under Multiaxial Nonproportional Compression of Sandstone. Dokl. Phys. 65, 396–399 (2020). https://doi.org/10.1134/S1028335820110075
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DOI: https://doi.org/10.1134/S1028335820110075