Figure 6
The FCG rate, da/dN, – effective stress intensity factor range, ΔKeff, diagrams, together with the results of the crack closure analyses for (a) δ-FG and (b) CG. ΔKeff is given by subtracting the stress intensity factor for crack closing, Kcl, from the maximum stress intensity factor, Kmax. The Kcl is provided by the closure analyses in the “Method” section. Crack closure propensity on the relationship between load and compliance offset by Eq. (1) at ΔK = 10, 20, and 30 MPa m1/2 for (a-1) δ-FG and (b-1) CG. Load is divided by its maximum value. Solid and hollow marks denote the datasets for H-charged and non-charged specimens, respectively.
