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. Author manuscript; available in PMC: 2016 Jan 11.
Published in final edited form as: J Dent Res. 2007 Nov;86(11):1046–1050. doi: 10.1177/154405910708601105

FIGURE 3.

FIGURE 3

Plot of crack depth h as a function of number of cycles n in glass/polycarbonate bilayer, for (a) R-ratio fatigue; (b) uniaxial fatigue; and (c) biaxial fatigue. Indentation with WC sphere of radius r = 1.5 mm, maximum load Pm = 120 N, in water. Failure occurs when crack depth h reaches glass/polycarbonate interface (top of the vertical axis, glass thickness d = 1000 µm) at critical number of cycles nF (vertical dashed lines). Note: crack growth substantially enhanced in biaxial loading.