Accession Number:

ADA265627

Title:

Role of Microstructure on Fatigue Durability of Aluminum Aircraft Alloys

Descriptive Note:

Progress rept.,

Corporate Author:

ALUMINUM CO OF AMERICA ALCOA CENTER PA ALCOA LABS

Report Date:

1993-04-15

Pagination or Media Count:

131.0

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 andor 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

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE