Abstract
Crack propagation rate, da/dN, and crack tip closure stress, σ cc, in part-through crack fatigue specimens of aluminum alloys are drastically affected by gaseous environments. The present studies indicate that the crack closure reflects the influence of the environment on the plastic deformation at the crack tip, and, therefore, on the crack propagation rates. Postulating that da/dN is mainly determined by ΔK eff ∝ (σ max−σ cc) (instead of ΔK ∝ (σ max−σ min) , as is done traditionally) leads to the relationship da/dN = A(ΔK eff) n in which A and n are virtually independent of the gaseous environment. The exponents are n ≈ 3.3 for Al 7075 T651 and n ≈ 3.1 for Al 2024 T351, respectively.
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