Geodesic
Orientation nature of the damage-memory effect under triaxial cyclic nonproportional compression of~a~sandstone
Journal of Samara State Technical University, Ser. Physical and Mathematical Sciences, Tome 26 (2022) no. 2, pp. 293-310

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The paper describes the mechanisms and conditions for the damage-memory effect (Kaiser effect) in rocks subjected to a three-dimensional nonproportional cyclic loading with changes in the rocks' shape and orientation of the Lamé-ellipsoid. The experiments with the cubic samples taken from polymictic sandstone were conducted on Triaxial Independent Loading Testing System with continuous recording of an acoustic emission signals. The results of a nonproportional triaxial compression under the developed protocol, it is 9-cycle loading program, have shown that a dominate mechanism of the damage-memory effect in each ensemble of cracks (vectored differently) is the development of micro-cracks of opening fracture mode oriented subnormally to the minimum main stress. It was found that the Kaiser damage-memory effect is detected not so much to the fact of opening cracks, friendly oriented, as to a discrete growing (increase of length) of already existing and newly emerging micro-cracks. The obtained results can be considered as a trigger for models development oriented to strain and destruction of rocks, taking into account the anisotropic nature of damage accumulation.
Mots-clés : Kaiser effect, rotation of Lamé-ellipsoid, changes in Lamé-ellipsoid shape
Keywords: acoustic emission, true triaxial loading, nonproportional cyclic compression, orientation nature of the damage-memory effect. 
@article{VSGTU_2022_26_2_a4,
     author = {I. A. Panteleev and A. V. Zaitsev and K. B. Ustinov and V. A. Mubassarova and N. I. Shevtsov and V. V. Khimulia and V. I. Karev and Yu. F. Kovalenko},
     title = {Orientation nature of the damage-memory effect under triaxial cyclic nonproportional compression of~a~sandstone},
     journal = {Journal of Samara State Technical University, Ser. Physical and Mathematical Sciences},
     pages = {293--310},
     publisher = {mathdoc},
     volume = {26},
     number = {2},
     year = {2022},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VSGTU_2022_26_2_a4/}
}
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I. A. Panteleev; A. V. Zaitsev; K. B. Ustinov; V. A. Mubassarova; N. I. Shevtsov; V. V. Khimulia; V. I. Karev; Yu. F. Kovalenko. Orientation nature of the damage-memory effect under triaxial cyclic nonproportional compression of~a~sandstone. Journal of Samara State Technical University, Ser. Physical and Mathematical Sciences, Tome 26 (2022) no. 2, pp. 293-310. http://geodesic.mathdoc.fr/item/VSGTU_2022_26_2_a4/