13th International Conference on Fracture June 16–21, 2013, Beijing, China literature (e.g. [18]) are usable. On the other hand, the threshold stress intensity factor range, ΔKth, must be reduce by tensile residual stress field and may be increase by compressive residual stress field (e.g. welding residual stresses). 1,0E-07 1,0E-06 1,0E-05 1,0E-04 1,0E-03 1,0E-02 1 10 100 1000 Stress intensity factor range, ΔK, MPam1/2 Fatigue crack growth rate, da/dN, mm/cycle 37C base material - I 37C welded joint - I DP-25156 base material - I E420C base material - I E420C welded joint - I TRIP-28670 base material - I X80TM base material - I X80TM welded joint - I QStE690TM base material - I QStE690TM base material - I+II S960QL base material - I XABO 1100 base material - I Figure 5. Fatigue design limit curves for the investigated steels, and their welded joints The calculated fatigue crack propagation limit curves of base materials locate among the design curves determined by various procedures. Table 5. summarizes our measured average data and measured individual data can be found in the literature [19]. It can be concluded that our average values are in harmony with the individual values. -7-
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