applied fracture mechanics

92Applied Fracture Mechanics(0L ) the behavior is explained by the influence of the shape function Y L the testing methodology [41].0 /w used inFigure 7. Load (X) versus displacement (u) for a G-R curve test in a ceramic sample [41].J-R curves obtained from standard metallic specimens provided by ASTM standard testingare shown in Figure 9 along with the fitting with the proposed fractal models. Fitting resultswith these samples, named DCT1, DCT2 and DCT3, are a consistent validation of theapplied fractal models. The fitting results of the self-similar and self-affine models coincideand are not distinguishable in Figure 9.Figure 8. G-R curve fitted with the self-similar model (equation (97)) and the self-affine model(equation (100)) for the Alumina sample [41].