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[12] [10] [8] [6] [4] [2] G = 121 J/m2 G = 22 J/m2 r1/2 COD (microns) r (microns)x102 Fig. 3 Plots of crack opening displacement profiles as a function of r at different of GI and GIB which showing increase in displacements with addition of small load. Fig. 4 Plots of crack opening displacement profiles as a function of r at different of GIB which showing decrease in displacements with addition of small load. Fig. 5 Failure map of coated material. Normalised critical load P* = P/R2 dependent on ratio of layer thickness h to indenter radius R (h* = h/R) for a substrate yield strength of 1. 5 GPa and a film fracture strength of 15 GPa.
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[6] [5] [4] [3] [2] [1] GI = 35 J/m2 COD (microns) r (microns)x102 GIB = 62 J/m2 GI = 22 J/m2 GIB = 58 J/m2.
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[3] [2] [1] [2] [1] GIB = 33 J/m2 COD (microns) r (microns)x102 GIIB = 155 J/m2 GIB = 33 J/m2.
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1000. 0 100. 0 10. 0 1. 0 0. 1 Normalized critical load, P*x106 in N/m2 Normalized layer thickness, h* 0. 1 1. 0 10. 0 100. 0 1000. 0 elestic region plastic deformation of substrate coating failure.
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