applied fracture mechanics

210Applied Fracture MechanicsIt is quite clear that the mid section (range) of the da/dN-K curve contains much moreexperimentally gained points despite the same criterion for data recording in the course oftesting work for all three ranges, and also, independently of the fact that both the curvesoverlap over some specific section common to both of them. Furthermore, the plot presentsthe above-discussed changes in the monotonicity of how they run, independently ofwhether the calculations of the da/dN derivative have been conducted for unsmoothed orsmoothed data – Fig. 8.(a)(b)(c)(d)Figure 7. Curves a-N and da/dN-K for the first (I) – a), b), and the second (II) test stages – c), d)3.2. A Method of Regular Curves Mapping (MRCM)Disturbances in the run, monotonicity of curves da/dN-K as well as different measuring-datadensity in particular areas of the graph do not serve well any attempts to theoretically describethese curves. As mentioned earlier, the least squares methods better fit regression curves to