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- Title
FATIGUE CRACK GROWTH RATES IN Al–Li ALLOY, 2090. INFLUENCE OF ORIENTATION, SHEET THICKNESS AND SPECIMEN GEOMETRY.
- Authors
Mc; Tabrett; Smith
- Abstract
.The fatigue crack growth (FCG) behaviour of the aluminium–lithium (Al–Li) alloy 2090-T84 has been investigated from a series of constant amplitude FCG tests. The influence of in-plane orientation (L–T, T–L, L–T + 45°) and sheet thickness (1.6 and 6 mm) on the FCG rates for the rolled product has been examined. In general, the T–L orientation possesses superior FCG resistance for both thicknesses and the 6 mm thick sheet material showed marginally improved FCG resistance when compared to the 1.6 mm thick material, for all orientations. Closure-corrected FCG data suggests that much of the difference between the L–T and T–L orientation for the 6 mm thick sheet arises from differences in crack closure levels. When comparing the crack closure levels for C(T) and M(T) specimens, a significant difference is shown as ΔK increases. Fatigue crack growth rates for ΔK less than 15 MPa m were significantly higher in the M(T) specimens compared to the C(T) specimens. Compared with other factors examined the influence of specimen geometry appears to be a dominant factor.
- Subjects
MATERIAL fatigue; FRACTURE mechanics; ALUMINUM-lithium alloys
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 1998, Vol 21, Issue 2, p139
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1046/j.1460-2695.1998.00428.x