| Indentation 1
 UNDERSTANDING CONTACT DAMAGE IS CRITICAL TO IMPROVING THE 'USEABLE' STRENGTH OF GLASSTrevor Wilantewicz submitted a PhD thesis to Alfred University (supervisor, Prof. J. Varner) in 2005. A remarkable study of indentation in many commercial glasses.Trevor Complete Thesis.pdf
In 1983, Tim Dabbs submitted a thesis concerned with Sub Threshold cracking. This thesis laid the groundwork for our understanding of glass cracking.1-27,8.81.pdf, 28-70, 9.9.pdf, 71-108, 8.93.pdf, 109-145, 8.3.pdf, 146-167, 5.5.pdf, 168-191, 6.11.pdf, 192-214, 6.99.pdf, 215-236.pdf
| | Understanding 'EDGE' cracks is critical to understanding contact damage:
below: 3N Vickers indent in silica, RT. Notice 'edge' cracks roughly straight along the edge as well as curving inward: ring crack precursor?
right (a)&(b): 10N Vickers in silica, 77K
(a) one 'edge' crack along the edge (b) 'edge' crack curved - ring crack precursor? 
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