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. Author manuscript; available in PMC: 2015 May 27.
Published in final edited form as: J Mater Res. 2009 Mar 1;24(3):1075–1081. doi: 10.1557/jmr.2009.0081

Figure 2.

Figure 2

In-situ observation of crack evolution in a flat quartz glass/polymer bilayer (glass thickness d = 1 mm), cyclically indented with a tungsten carbide sphere of radius r = 1.6 mm at Pm = 100 N, in water. (a) Initiation of outer cone cracks at n = 1 – 3, (b) propagation of inner cone cracks at n = 3 × 102, and (c) failure from inner cone fracture at n = 3.47 × 105.