applied fracture mechanics

Good Practice for Fatigue Crack Growth Curves Description 211areas where there is more approximated points, in the case given consideration, in the middleranges of the da/dN-K curves. To eliminate this effect, application of the Authors’ Method ofRegular Curves Mapping (MRCM) to approximate the da/dN-K curves is advisable.(a)(b)(c)Figure 8. Curves a-N and da/dN-K and how they run at the I and II test stages: – results for data afterthe curve has been smoothed - a), b), and effect of having applied the MRCM – c)The MRCM technique of mapping test data consists in fixing, at regular intervals (alongaxes x or y), the k number of representative points in the data set under analysis (upon theexperimentally gained curve). The following actions are to be taken:a. determined are selected values of coordinates xi (or yi), for which the above-mentionedpoints will be fixed (i = 1,2, ….,k),b. from the curve under analysis, point x’i (or y’i) is fixed, of coordinate value closest to theassumed value of xi (or yi), and 2m of adjacent points – by assumption, in half these are