✦ LIBER ✦
Fatigue crack propagation rate at low ΔK of two aluminum sheet alloys, 2024-T3 and 7075-T6
✍ Scribed by T.L. Mackay
- Publisher
- Elsevier Science
- Year
- 1979
- Tongue
- English
- Weight
- 434 KB
- Volume
- 11
- Category
- Article
- ISSN
- 0013-7944
No coin nor oath required. For personal study only.
✦ Synopsis
For transport aircraft with long lifetimes, crack growth data to implement the durability life requirements in the low AK range are needed. This is the region comprising most of the lifetime for the cracks of interest, and it is also the region where there is little data available. Crack growth data in the form of da/dN vs AK vs R at constant ampfitude for two primary aircraft aluminum sheet alloys, 2024-T3 and 7075-T6 (clad) were measured in laboratory air and 140~F in the low da/dN region 10 -s to 10 -~ in./cycle. Crack growth rates were correlated with stress state and with fractographic features.