Defect formation in synthetic quartz crystals under uniaxial compression

The paper discusses the possibility of using a complex of non-destructive acoustic emission and laser ultrasonic testing methods to study the behavior of synthetic quartz crystals under cyclic loading. An automated laser ultrasonic structureroscope GEOSKAN-2MU was used to study the mechanical properties of synthetic quartz subjected to two successive loading cycles, monitoring the process of formation of defects in its internal structure. The experimental results were interpreted using numerical simulation based on the Drucker-Prager model, which describes the behavior of a medium under uniaxial compression, taking into account its strength characteristics. It is found that, despite the presence of a small number of defects and heterogeneities in the specimen before loading, the onset of microcrack growth occurs at an external load of 30 MPa, which is about ten percent of the failure stress. At an external load of 75 MPa, microcracks more than 20 mm long appear in the central part of the specimen. The results of this study can be used to develop a numerical model that will take into account the nonlinear dependence of deformations and stresses on the external load.

Jan Pruška, Kravcov A. N., Sas I. E., Cherepetskaya E. B., Viegas Jose Victorino, Borisov N. G. Defect formation in synthetic quartz crystals under uniaxial compression. MIAB. Mining Inf. Anal. Bull. 2021;(4-1):73—80. [In Russ]. DOI: 10.25018/0236_1493_2021_41_0_73.

Jan Pruška¹, Assistant professor;
Kravcov A. N.¹, PhD, kravtale@fsv.cvut.cz;
Sas I. E.², engineer;
Cherepetskaya E. B.², Dr. Sci. (Eng.), Professor;
Viegas Jose Victorino², student;
Borisov N. G.², PhD-student;
¹ Czech Technical University in Prague, Faculty of Civil Engineering, Thákurova 7/2077, Prague 6 — Dejvice, 166 29, Czech Republic;
² National Research Technological University «MISiS» , Moscow, Russia.

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