Role of Microstructure on Fatigue Durability of Aluminum Aircraft Alloys

Abstract

Alcoa historical 7050 fatigue test data has been assembled and reviewed. The range of microstructures examined in the program has been expanded from two in the contract proposal to five. In addition to the old and new quality thick plate, the program includes low porosity thick plate, low particle thick plate, and thin plate. These materials provide a range of microstructures/ fatigue failure modes to help understand and model early stage fatigue damage. Through the scope of the program has expanded, the total program cost to the Navy has not changed. The fatigue test data on additional microstructural variants of 7050 have been assembled. Fractography of failed coupon specimens has been completed. The microstructural features controlling fatigue initiation have been identified. Samples of old and new quality plate have been supplied to the UCLA team in support of their ONR program.

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Document Details

Document Type
Technical Report
Publication Date
Mar 09, 1993
Accession Number
ADA266350

Entities

Organizations

  • Alcoa

Tags

DTIC Thesaurus Topics

  • Aircrafts
  • Airframes
  • Contract Administration
  • Contract Proposals
  • Contracts
  • Databases
  • Engineering
  • Failure Mode And Effect Analysis
  • Fatigue Tests (Mechanics)
  • Fracture (Mechanics)
  • Manufacturing
  • Materials
  • Mechanics
  • Military Research
  • Particle Size
  • Scaling Laws
  • Structural Components

Readers

  • Materials Science (Mechanical Engineering).
  • Metallurgy
  • Research Science/Academic Research