MECHANISM OF FATIGUE OF COPPER AT INTERFACES.

Abstract

Studies are made of how torsion fatigue processes in pure copper with free surfaces differ (a) when the copper is covered with an electrodeposited coating (Ni, Cr, Au) and (b) when the copper contains embedded wires of tungsten as in a composite. The aim was to evaluate resulting fatigue performance from microstructural observations. Effects of coatings depend on fatigue amplitude, being in general deleterious at large amplitudes but inherently capable of effecting improvement at small amplitudes, especially if the coating is ductile as gold is. Embedded wires in the composites inevitably accentuated fatigue deformation and cracking of the copper matrix; but could lead to improved performance if used as crack stoppers. Examples of improved performance are given. (Author)

Document Details

Document Type
Technical Report
Publication Date
May 01, 1967
Accession Number
AD0656427

Entities

People

  • R. G. Gates
  • W. A. Wood

Organizations

  • Columbia University

Tags

DTIC Thesaurus Topics

  • Amplitude
  • Coatings
  • Composite Materials
  • Deposition (Materials Processing)
  • Electrodeposition
  • Electrolytic Processes
  • Electroplating
  • Material Coating Processes
  • Materials
  • Materials Processing
  • Observation
  • Plating
  • Tungsten

Fields of Study

  • Materials science

Readers

  • Reinforced Composite Materials
  • Structural Health Monitoring of Composite Structures.
  • Systems Analysis and Design