Role of Microstructure on Fatigue Durability of Aluminum Aircraft Alloys
Abstract
The goal of this program is to affect change in metallic aircraft life assessment methodology through quantitative understanding of how material microstructure impacts fatigue durability performance. Various studies have shown that most metal cracking problems encountered in service involve fatigue. Further studies have shown that metallurgical discontinuities and/or manufacturing imperfections often tend to exacerbate such problems by causing cracks to occur sooner than expected. This program concentrates on the initiation and early growth stage of fatigue cracks where the majority of structural life is spent. The program has two general objectives: (1) quantifying effect of aluminum alloy microstructure on early stage fatigue damage evolution and growth, and (2) establishing an analytical framework to quantify structural component life benefits attainable through modification of intrinsic material microstructure. The modeling approach taken couples quantitative characterizations of representative material microstructures with concepts of probabilistic fracture mechanics
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 15, 1993
- Accession Number
- ADA265627
Entities
People
- A. J. Hinkle
- J. R. Brockenbrough
- Jing Liu
- P. E. Magnusen
- R. J. Bucci
Organizations
- Alcoa