13th International Conference on Fracture June 16–21, 2013, Beijing, China -7- If the integration path bcd s is half circle and within the Kind-dominant region, the following equation can be found. ( ) ∫ − = − = afe s i i I c c wn Tu ds K E J ,1 1 2 2 1 2 1 µ . (28) Figure 5. Integration path for the layered substrate for Mode-I indentation. Figure 6. Boundary cracking for Mode-I indentation. 5. Boundary cracking in Mode-I indentation In section 2, an expression describing the strain energy release rate of boundary cracking has been derived. It will be used to discuss the boundary cracking in the case of the complete sliding contact Indenter P(x1) P x1 x2 2l Substrate a b c d e f n n Coating layer t m mʹ n nʹ Es, µs Ec, µc
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