The Plastic Zone and Residual Stress near a Notch and a Fatigue Crack in HSLA Steel.

Abstract

The plastic zone and residual stress around a notch under load and with the load removed, and around a fatigue crack (at the same stress intensity factor as for the notch) have been examined, with automated X-ray techniques and a microbeam. There is a good agreement between the measured plastic zone size and Hutchinson's theory for a work hardening material. Residual stresses exist well behind the tip, and vary with depth, so that measurements of crack closure on a surface may not be directly related to closure stress (which samples the bulk). Instabilities in the dislocation arrangement can be detected by comparing X-ray line broadening of bulk specimens under load, and with the load removed. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Dec 16, 1981
Accession Number
ADA109890

Entities

People

  • Jerome B. Cohen
  • W. H. Schlosberg

Organizations

  • Northwestern University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Coefficients
  • Computer Programming
  • Computers
  • Control Systems
  • Diffraction
  • Diffractometers
  • Fourier Analysis
  • Materials
  • Materials Science
  • Measurement
  • Particle Size
  • Plastic Deformation
  • Scattering
  • Tensile Strength
  • Tensile Testing
  • Two Dimensional
  • X Rays

Readers

  • Metallurgy
  • Reinforced Composite Materials
  • Thin Film Deposition Science.