13th International Conference on Fracture June 16–21, 2013, Beijing, China 20 000 40 000 Rm x A=60 000 70 60 50 40 30 20 10 0 200 400 600 800 1000 1200 1400 Ultimate tensile strength, Rm, N/mm2 MART TRIP DP, CP HPF U-AHSS CMn HSLA Mild HS IF BH X-AHSS IS Figure 1. The investigated base materials in the ultimate tensile strength vs. elongation diagram Fig. 2, Fig. 3 and Fig 4 show the calculated kinetic diagrams (fatigue crack propagation rate vs. stress intensity factor range curves) of tested DP-25156 and TRIP-28670 steels using SENT specimens, and S960QL steel using TPB specimens, respectively. 1,0E-07 1,0E-06 1,0E-05 1,0E-04 1,0E-03 1,0E-02 1,0E-01 1,0E+00 10 100 1000 Stress intensity factor range, ΔK, MPam1/2 Fatigue crack growth rate, da/dN, mm/cycle DP_25156_1 DP_25156_2 DP_25156_3 DP_25156_4 DP_25156_5 DP_25156_6 Figure 2. Kinetic diagrams of fatigue crack propagation from tested DP-25156 steel (SENT specimens) -3-
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