Scale effect on strength of technical devitrified glasses in bending
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Relationship of the bend strength of technical devitrified glasses to the scale factor has a maximum, the presence of which is explained by the total action of surface and volume defects of the material.
With an increase in the volumes of samples from 2025 to 43,200 mm3 (the first branch of the scale effect curve) there is a reduction in the average values of strength, reaching 22 and 26% for STL-10 and A-1 devitrified glasses, respectively. In this area the relationship of strength to sample dimensions is described sufficiently well by the equations of the statistical theories of brittle strength of V. Weibull and V. V. Bolotin and the error in the use of these equations does not exceed 5%.
The possibility of joining the experimental data of strength tests in a single general combination was determined and on the basis of regression analysis a linear relationship (in logarithmic coordinates) was established between the bend strength of technical devitrified glasses and the minimum size of the mirror zone of the fracture of different size samples.
KeywordsExperimental Data Brittle Regression Analysis Linear Relationship Statistical Theory
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