Figure 16. G Imax vs. d a /dN diagram for 6.35-mm-thick DCB specimens under constant amplitude Figure 16. G Imax vs. da/dN diagram for 6.35-mm-thick DCB specimens under constant amplitude Figure 16. G Imax vs. d a /dN diagram for 6.35-mm-thick DCB specimens under constant amplitude fatigue. fatigue. fatigue.