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Variation of energy release rate as crack advances using Kendall's, SC model and our FEM result when h/a = 0.1. Energy release rate is normalized by the value when crack front is at the contact edge. The normalized contact radius for rigid punch model (Kendall, SC) is c/a, where a is the punch radius. For our model, it is c/(a + d) (figure 3). (Online version in colour.)
