An Analysis of Residual Stresses and Displacements Due to Radial Expansion of Fastener Holes

Abstract

Pre-expanding fastener holes with an oversize mandrel has received considerable attention for use in aircraft structures, since this process has been shown to greatly improve the fatigue life of fastener holes. The deformation theory of plasticity is used here to determine the residual stress and displacement field caused by this process. Employing plane stress assumptions, general results are obtained for various interference levels and are presented in a graphical form useful to the designer. In addition, this analysis indicates that there is an optimum level of interference dependent primarily on the plate geometry. The optimum interference levels agree well with experience values established by fatigue testing in aircraft structural alloys.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1979
Accession Number
ADA076370

Entities

People

  • A. F. Grandt
  • R. M. Potter

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Ground and Sea Platforms
  • Space

DTIC Thesaurus Topics

  • Aeronautical Laboratories
  • Air Force
  • Air Force Facilities
  • Boundaries
  • Cold Working
  • Differential Equations
  • Equations
  • Fatigue Life
  • Geometry
  • Materials
  • Materials Laboratories
  • Mechanical Working
  • Mechanics
  • Plastic Flow
  • Radial Stress
  • Residual Stress
  • Stresses

Readers

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