| Autor: |
Dubovik, V. N., Raikhel', A. M., Shvedun, V. G., Ivchenko, L. G., Nepomnyashchii, O. A. |
| Zdroj: |
Strength of Materials; September 1981, Vol. 13 Issue: 9 p1157-1161, 5p |
| Abstrakt: |
1.The surface damageability in impact and contact strength of devitrified glasses depends upon their phase composition and mechanical and micromechanical properties. An increase in Young's modulus, microhardness, and microbrittleness leads to a decrease in surface damageability and an increase in contact strength of devitrified glasses.2.The character of change in the strength of damaged devitrified glass samples in relation to the force of impact corresponds to the type of their defectiveness. Devitrified glasses of the spodumene system have a combined defectiveness including macroscopic manufacturing and microscopic structural defects while the defectiveness of cordierite system glasses is uniform on the surface and in the volume. Combined defectiveness and the related sensitivity of the surface condition causes a decrease in the strength of damaged samples with an increase in the force of impact while uniform defectiveness provides stable strength of the damaged samples all the way to the critical force of impact.3.Strengthening of devitrified glasses by deep etching in HF without protection of the etched surface from external mechanical actions is ineffective as a result of the high damageability of such a surface. |
| Databáze: |
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