Q: Why when I analyze the same model using the old and new Moses version I get big differences in CDR values?
REV 5.10

A: When you run the new version of the program you get small differences in stress values due to program improvements. One should keep in mind that fatigue damage is approximately proportional to stress raised to the power of the inverse slope of the SN curve. Since CDR is a sum of ratios of the applied number of cycles and the number of cycles for which the given stress range would be allowed, then small changes in stress result in much greater changes in CDR value. For example, just a 5% stress difference gives a 20% to 23% difference in CDR depending on the type of the SN curve.