Issue 49

Y. Chang et alii, Frattura ed Integrità Strutturale, 49 (2019) 1-11; DOI: 10.3221/IGF-ESIS.49.01 6 Figure 4: Distribution of grain size underneath FGA surface for samples A1, B1 and B2. Figure 5: Thickness of nanograin layer along crack growth path underneath FGA surface for samples A1, B1 and B2. Figure 6: Distribution of normalized quantity d * versus crack growth path for samples A1, B1 and B2. 0 20 40 60 80 100 120 140 160 0 10 20 30 40 50 60 Frequency, % Grain Size, nm A1, d = 54 nm B1, d = 48 nm B2, d = 73 nm 0 2 4 6 8 10 0 200 400 600 800 1000 A1, t = 315 nm B1, t = 435 nm B2, t = 386 nm Thickness of Nanograin Layer, nm Distance along Crack Growth Path, μm 4 6 8 10 12 14 16 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 A1, RB, R =  1 B1, UL, R =  1 B2, UL, R =  0.5 d* , Normalized Quantity Distance along Crack Growth Path, μm