3. Results The variance study ANOVA results are show in Figs. (2) and (3). The values in Italic have high significance. Factors SS df MS F (fisher) p (1)Substrate (L) 14,42 1 14,42 33,88 0,000026 (2)Film structure (L) 16,68 1 16,68 39,21 0,000011 (3)Film thickness (L+Q) 3,27 2 1,63 3,84 0,043463 (4) µ Friction coef (L+Q) 0,64 2 0,32 0,75 0,488018 Interaction 1 x 2 14,35 1 14,35 33,73 0,000027 Interaction 1 x 3 3,70 2 1,85 4,35 0,030995 Interaction 1 x 4 0,67 2 0,34 0,79 0,470006 Interaction 2 x 3 3,29 2 1,65 3,87 0,042603 Interaction 2 x 4 0,65 2 0,32 0,76 0,483810 Interaction 3 x 4 0,83 4 0,21 0,49 0,745476 Error 6,81 16 0,46 Total SS 65,31 ANOVA; Var.:KI/KIc; R 2 =0,89576; R Adj=0,77198 Experiment with 2 factors at 2 levels combined with 2 factors at 3 levels, 36 runs ; MS Residual=0,4254813 Figure 2. ANOVA results for KI/KIc. Factors SS df MS F (fisher) p (1)Substrate (L) 0,67 1 0,67 31,83 0,000037 (2)Film structure (L) 0,80 1 0,80 38,16 0,000013 (3)Film thickness (L+Q) 0,21 2 0,10 4,89 0,021926 (4) µ Friction coef (L+Q) 0,04 2 0,02 0,91 0,421088 Interaction 1 x 2 0,60 1 0,60 28,49 0,000067 Interaction 1 x 3 0,18 2 0,09 4,31 0,031890 Interaction 1 x 4 0,04 2 0,02 1,02 0,381568 Interaction 2 x 3 0,17 2 0,08 4,17 0,034908 Interaction 2 x 4 0,04 2 0,02 0,97 0,398810 Interaction 3 x 4 0,05 4 0,01 0,60 0,670521 Error 0,34 16 0,02 Total SS 3,15 ANOVA; Var.:KII/KIIc; R 2 =0,89293; R Adj=0,76579 Experiment with 2 factors at 2 levels combined with 2 factors at 3 levels, 36 runs ; MS Residual=0,0210749 Figure 3. ANOVA results for KII/KIIc The results on Fig.(2) and (3) shows that the film structure (FGM x HMG) and his interactions, followed by the substrate material, are the most important factors to prevent fracture failure, on mode I and II. The film thickness is a significant factor, but lower (about 10 times) than the material factors significance. The friction is not significant for mode I and II. On Fig. (4), it is possible to compare the significance of the factors and their interactions.
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