Fatigue behavior of thick center cracked aluminum plates repaired by two-sided composite patching

Paris law was used to describe the relationship between the fatigue crack growth rate (dadN) and the stress intensity factor range (∆ K). In the present study, the material constants C and m for two-sided repaired plates were assumed to be the same as the unrepaired plates. dadNu, dadNr represent the fatigue crack growth rate of unrepaired and two-sided repaired plates, respectively. ∆ Ku, ∆ Kr represent the stress intensity factor range of unrepaired and two-sided repaired plates, respectively.230