13th International Conference on Fracture June 16–21, 2013, Beijing, China -8- FSW panel ( =25MPa) Base metal （ =25MPa） 5 2 104 10-5 10-6 Stress intensity factor range ΔK / MPa・m1/2 Crack growth rate da/dN / mm/ cycle Weldline of FSW 10 10-3 3.7 times Figure 9. da/dN-K curves ( = 25 MPa) Figure 10. Comparison of fatigue crack growth rate 0 1 2 3 4 0 25 50 75 100 Ratio of da/dN (FSW panel / Base metal) stress range MPa =75 MPa =50 MPa =25 MPa
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