applied fracture mechanics

Fractal Fracture Mechanics Applied to Materials Engineering 93Figure 9. J-R curve fitted with the self-similar model shown in equation (97) and the self-affine modelshown in equation (93) for steel samples DCT1, DCT2 and DCT3 [43].Typical testing results performed to obtain J-R curves of metallic weld materials are shownin Figure 10 and Figure 11. In all results, J-R curves measured experimentally were fittedusing models given by equations (93) and (97), where the factor 2e pwas obtained byadjusting the l 0and H values for each different sample, by the self-similar and the selfaffinemodels.The J-R curves for the tested polymeric specimens are shown in Figure 12 and Figure 13.Reasonably good results were obtained despite the greater dispersion of data.Figure 10. J-R curve fitted with the self-similar model shown in equation (97) and the self-affine modelshown in equation (93) for HSLA-Mn/Ti steel (sample A1CT2).