Low stress intensity fatique crack growth in 2024-T3 and T351

Constant amplitude fatigue crack growth properties of five batches of aluminium alloy 2024 in the naturally aged T3 and T351 conditions are compared. Particular attention is paid to crack growth curve transitions in the near-threshold regime. These transitions correspond to monotonie or cyclic plane strain plastic zone dimensions becoming equal to characteristic microstructural dimensions. Changes in fracture surface topography are associated with the transitions also. From the observations an explanation of the shape of the low stress intensity fatigue crack growth curve and the transitions is given.

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