Factors (1)Substrate (L) (2)Film structure (L) (3)Film thickness (L+Q) (4) µ Friction coef (L+Q) Interaction 1 x 2 Interaction 1 x 3 Interaction 1 x 4 Interaction 2 x 3 Interaction 2 x 4 Interaction 3 x 4 0 5 10152025303540 Fisher values for KII/KIIc 0 5 10152025303540 Fisher values for KI/KIc Figura 4. Fisher distribution values of influence factors on KI/KIc and KII/KIIc modes. The results of KI/KIc and KII/KIIc obtained by Eq.(9) corresponding to the principal directions, for µ=0.25, for film thickness thin, medium, large, for TiN film FGM and HMG over steel and aluminium substrate, are shown in Fig. (5a), (5b), (6a), (6b). 0,00 0,02 0,04 0,06 0,08 0,10 0,12 0,14 0,16 0,18 0,20 0,5 1 1,5 2 KI/KIc ; KII/KIIc µ=0,25 St HMG KI/KIC KII/KIIc thickness y/a K/Kc 0,00 0,02 0,04 0,06 0,08 0,10 0,12 0,14 0,16 0,18 0,20 0,5 1 1,5 2 KI/KIc ; KII/KIIc µ=0,25 St FGM KI/KIC KII/KIIc thickness y/a K/Kc (a) (b) Figure 5. KI/KIc and KII/KIIc for µ=0.25 Steel, (a) TiN HMG, (b) TiN FGM. In Fig. (5) is possible to see that for TiN film HMG over steel substrate, the fracture mode I is more important than the mode II, except for thin films, although these values for thin films are not high when compared with other film thickness. For TiN film FGM over steel substrate, the mode of fracture II is more important than the mode I for all thickness, although the values are not high when compared with TiN HMG steel cases.
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