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Strength Degradation of Glass Impacted with Sharp Particles: II, Tempered Surfaces
Author(s) -
LAWN B. R.,
MARSHALL D. B.,
WIEDERHORN S. M.
Publication year - 1979
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1979.tb18809.x
Subject(s) - materials science , degradation (telecommunications) , indentation , composite material , toughness , impaction , impact energy , fracture toughness , erosion , geology , medicine , telecommunications , paleontology , surgery , computer science
The analysis of strength degradation in the preceding paper is here extended to tempered surfaces. Addition of a surface compression term to the indentation fracture equations leads to simply modified degradation relations. Impact energy is again identified as the important service variable in degradation. Comparative strength tests on thermally tempered and annealed glass disks after impaction with SiC particles confirm the predicted energy dependence of strength loss. The results indicate that surface‐strengthening processes can be just as effective in improving resistance to strength degradation as can increasing toughness. However, improvements in surface erosion resistance are relatively insignificant.