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Ring-on-Ring Strength Measurements on Rectangular Glass Slides



Theo Fett, G Rizzi, J -. Guin, Sheldon M. Wiederhorn


The ring-on-ring test has been standardized and used extensively for strength measurements on glasses and ceramics. The specimen is especially useful to avoid edge defects that often dominate the failure of flexure bars. In this paper, we extend the technique to specimen shapes that are not circular. The method of finite analysis is used to determine the stresses beneath the loading points of the rings. The ring-on ring test is then applied to microscope slides that have undergone ion exchange in water (l). From bending measurements discussed in an earlier paper, and the current results from ring-on-ring tests we are able to demonstrate that compressive stresses, approximately 2.2 GPa to -2.4 GPa develop in the exchanged surface, most likely as a consequence of the exchange of hydronium ions in the water for sodium ions in the glass.
Journal of Materials Science Letters


elastic analysis, fracture, glass, ring-on-ring test, strength


Fett, T. , Rizzi, G. , Guin, J. and Wiederhorn, S. (2021), Ring-on-Ring Strength Measurements on Rectangular Glass Slides, Journal of Materials Science Letters (Accessed April 13, 2024)
Created October 12, 2021