Orientation nature of the damage-memory effect under triaxial cyclic nonproportional compression of~a~sandstone

I. A. Panteleev ; A. V. Zaitsev ; K. B. Ustinov ; V. A. Mubassarova ; N. I. Shevtsov ; V. V. Khimulia ; V. I. Karev ; Yu. F. Kovalenko

Journal of Samara State Technical University, Ser. Physical and Mathematical Sciences, Tome 26 (2022) no. 2, pp. 293-310.

Résumé

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.

Détail

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.

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