Influence of Subsurface Defects on Fatigue Properties of Titanium Alloys.

Abstract

This report summarizes work performed in which the influence of specific defects on the properties of titanium alloys is studied in order to provide insight into the origin and reason for the property modifications. Description of the types of defects that have been encountered were identified in the first semi-annual report. This has been used to establish an experimental and analytical program designed to gain insight into the nature and effect of two specific defects on subsequent mechanical properties. These two defects are, firstly small discontinuities that under cycle loading lead to rapid nucleation and growth of cracks. The appearance of the fatigue fracture surface has lead to the term 'cleavage rosette' to describe the failure characteristics. The second defect is the better characterized structural discontinuity that occurs in alpha beta processed titanium alloys and termed beta fleck. The major influence of these defects are on the fatigue properties of the material.

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Document Details

Document Type
Technical Report
Publication Date
Oct 25, 1976
Accession Number
ADA035820

Entities

People

  • C. C. Law
  • M. J. Blackburn

Organizations

  • Pratt & Whitney

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Auger Electrons
  • Chemistry
  • Crack Propagation
  • Fabrication
  • Failure Mode And Effect Analysis
  • Fatigue Life
  • Grain Size
  • Mass Spectrometry
  • Materials
  • Measurement
  • Mechanical Properties
  • Residual Stress
  • Spectra
  • Spectrometry
  • Spectroscopy
  • Surface Properties
  • Titanium Alloys

Fields of Study

  • Materials science

Readers

  • Educational Psychology
  • Materials Science and Engineering.
  • Structural Health Monitoring of Composite Structures.