Effect of Over-Stress on the Behavior of Micro-Cracks under Repeated Stress of Fatigue Limit : Rotating Bending of an Annealed 0.13%C Steel

An evaluation of strength wearout models for the lifetime prediction of adhesive joints subjected to variable amplitude fatigue

“…In most real applications these will all vary considerably in-service. Most of the previous studies of VAF in metals have shown crack growth retardation after overloads [2][3][4], however, there are also instances when crack growth accelerations in metals [5][6][7] and composites [8][9][10] have been seen. Studies on VAF in adhesively bonded joints have also reported accelerated failure [11][12][13].…”

Fracture mechanics and damage mechanics based fatigue lifetime prediction of adhesively bonded joints subjected to variable amplitude fatigue

“…One of the main types of VAF spectra investigated consists of overloads introduced after a certain number of constant amplitude cycles. Most of the previous studies in metals have shown crack growth retardation after overloads [16][17][18]; this is because of the formation of increased plastic zones ahead of the crack tip after overloads. However, crack growth accelerations have been seen in brittle metals [16][17]19] and composites [18] subjected to overloads.…”

“…Most of the previous studies in metals have shown crack growth retardation after overloads [16][17][18]; this is because of the formation of increased plastic zones ahead of the crack tip after overloads. However, crack growth accelerations have been seen in brittle metals [16][17]19] and composites [18] subjected to overloads. Less work has been published on the effect of mean load changes, however, Schaff and Davidson [20][21], associated mean load changes with…”