A PROPOSED MECHANISM OF FATIGUE FAILURE,

Abstract

Reversed slip is assumed to occur on a single plane, either from the beginning of repeated loading, or after an initial period of slip on different planes. Such slip requires unbonding of the atoms which emerge at the surface of the material. It is assumed that a portion of these atoms do not regain their original bond when the slip is reversed. This results in progressive unbonding along the slip plane. The proposed mechanism is shown to be in agreement with observed facts and is used as a basis for deriving various well-known equations for the sigmaN diagram. The mechanism and equations are used to interpret and explain such phenomena as the endurance limit, effects of mean stress, variable amplitude loading, stress-concentration, elevated temperature, corrosion, and surface treatment. (Author)

Document Details

Document Type
Technical Report
Publication Date
Apr 11, 1955
Accession Number
AD0604703

Entities

People

  • F. R. Shanley

Organizations

  • RAND Corporation

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Agreements
  • Amplitude
  • Corrosion
  • Equations
  • Material Degradation Processes
  • Materials
  • Stress Concentration
  • Stresses
  • Surface Finishing

Readers

  • Fluid Dynamics.
  • Mechanical Engineering/Mechanics of Materials.
  • Surface Engineering/Surface Coating Technology.