ON IMPROVEMENT OF FATIGUE LIFE BY DISPERSAL OF CYCLIC STRAIN.

Abstract

Tests are made of a hypothesis that fatigue occurs because cyclic strain concentrates in preferred zones instead of spreading uniformly through the microstructure of a metal as unidirectional strain does. Attempts are made to utilize the hypothesis and improve fatigue lives of copper polycrystals and single crystals by using prior cycling at elevated temperatures to enforce dispersal of strain. In polycrystals the procedure cannot be applied successfully because of concentrations of strain at grain boundaries but it can in single crystals. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1966
Accession Number
AD0808447

Entities

People

  • H. D. Nine
  • W. A. Wood

Organizations

  • Columbia University

Tags

DTIC Thesaurus Topics

  • Boundaries
  • Crystal Structure
  • Crystals
  • Fatigue Life
  • Grain Boundaries
  • Microstructure
  • Polycrystals
  • Single Crystals
  • Unidirectional

Readers

  • Materials Science and Engineering.
  • Mechanical Engineering/Mechanics of Materials.
  • Systems Analysis and Design