Fatigue-crack growth in two aluminum alloys and crack-closure analyses under constant-amplitude and spectrum loading

Newman, J. C.; Walker, K.

doi:10.1016/j.tafmec.2019.01.029

Cited by 19 publications

(1 citation statement)

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“…For large‐scale yielding (LSY) conditions in the presence of significant plasticity, the cyclic J integral is sometimes used instead of Δ K , although this requires complex information about the local nonlinear‐elastic constitutive behaviour 4,5 . Data is determined with standard compact tension (CT) or middle tension (MT) specimens up to a Δ K range of approximately 30 to 40 MPa√m 6–9 . FCG in ductile materials is generally related to transgranular ductile striation formation 10 with cyclic plastic deformations at the crack tip 11 .…”

Section: Introductionmentioning

confidence: 99%

High‐stress fatigue crack propagation in thin AA2024‐T3 sheet material

Breitbarth

Strohmann

Requena

2020

Fatigue Fract Eng Mat Struct

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Fatigue crack growth in 1.6-mm-thick sheets of aluminium alloy AA2024-T3 was investigated under very high-stress conditions using 950-mm-wide middle tension (MT) specimens. Experiments were conducted by applying uniaxial load ratios R (0.1, 0.3 and 0.5) with the maximum nominal stress of 120 MPa following conditions relevant for aircraft fuselage structures. The experiments were conducted with digital image correlation to determine loading conditions acting on the crack tip. Stable crack growth rates of up to da/dN > 4 mm/cycle and ΔK > 100 MPa√m were reached, and final crack lengths 2a > 500 mm were obtained. High-stress intensity factors cause plastic zone sizes that extend up to approximately 100 mm from the crack tip. The da/dN-ΔK data obtained in this study provide crucial information about the fatigue crack growth and damage tolerance of very long cracks under high-stress conditions in thin lightweight structures.

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Section: Introductionmentioning

confidence: 99%