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(a) Crack initiation map and (b) failure map for curved quartz glass on polymer bilayers subject to cyclic indentation with a tungsten carbide sphere of radius r = 1.6 mm, in water. Glass layer thickness d = 1 mm and inner radius ri = 4 mm. Oi and Ii indicate outer and inner cone crack initiation respectively, while Ri indicates radial crack initiation. If indicates inner cone failure, while Rf indicates for radial failure. Arrows in (b) indicate run out.
