Glass strength and fracture upon contact with a spherical indenter

Autor: L. V. Tikhonova, M. F. Kireenko, L. G. Baikova, V. P. Pukh
Rok vydání: 2012
Předmět:
Zdroj: Glass Physics and Chemistry. 38:444-448
ISSN: 1608-313X
1087-6596
DOI: 10.1134/s1087659612050021
Popis: Studies of sheet glass strength during bending tests and microstrength determined at contact with a sphere are performed. Measurements are carried out on glass with different surface conditions. It is established that the microstrength of glass with surface defects (under initial conditions or upon imparting a network of defects by friction) is almost an order of magnitude higher than that during bending tests. On the other hand, it is demonstrated that the microstrength of glass with a defect-free surface (obtained by etching in HF) is twofold lower than the glass bending strength. Deposition of a soft polymer coating enables one to increase significantly the resistance to crack formation on the glass surface and produce a maximal tensile stress at the contact zone boundary equal to the bending strength of glass with a defect-free surface.
Databáze: OpenAIRE
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