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Conditions of appearance of the topological defects of optical indicatrix orientation in the glasses with residual stresses: Movement of the defects under application of external mechanical stress to CaB4O7 glasses

Vasylkiv Yu., Kryvyy T., Skab I. and Vlokh R.

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Abstract. We have revealed experimentally a movement of the topological defects of optical indicatrix orientation, which takes place in CaB4O7 glass with residual mechanical stresses under application of external compressive mechanical stresses. The effect is explained basing on the equation of optical indicatrix perturbed by the combination of both residual and external mechanical stresses. The conditions for the appearance of the topological defects with the strength module |1/2| in glasses are formulated. Finally, possibilities for the appropriate topological reactions caused by the applied stresses are discussed.

Keywords: topological defects, optical indicatrix, residual stresses, glasses

PACS: 78.20.hb, 62.40.+I, 02.40.Pc
UDC: 535.551+620.171.5+515.143
Ukr. J. Phys. Opt. 17 65-74
doi: 10.3116/16091833/17/2/65/2016
Received: 23.03.2016

Анотація. У роботі експериментально виявлено зміщення топологічних дефектів орієнтації оптичної індикатриси, пов’язаних з існуванням залишкових напружень у склі CaB4O7, під дією стискаючого механічного напруження. Спостережуваний ефект пояснено на основі рівняння оптичної індикатриси, збуреної залишковими напруженнями і прикладеним механічним напруженням. Сформульовано умови появи в склі топологічних дефектів орієнтації оптичної індикатриси з модулем сили |1/2| і обговорено можливість топологічних реакцій, спричинених прикладеним напруженням.
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