CRACK INITIATION IN METALLIC MATERIALS

Abstract

Conditions for crack initiation as a function of test specimen geometry, test material, testing conditions and internal structure of the material were investigated. Tungsten and titanium sheet specimens were selected for the studies. Lithium fluoride and silver chloride were utilized to yield information concerning the dislocation motion and arrangement at and near existing cracks. Experimental resul s include the study of the effects of recrystallization on fracture strength of notched tungsten specimens, of surface condition of smooth and notched titanium and tungsten specimens as well as a description of dislocation arrangements in lithium fluoride single crystals near existing cracks. Tensile and notch tensile specimens containing machine titanium specimens were tested after the surface had been electropolished and the etch root had been prepared by electrolytical machining.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1962
Accession Number
AD0296159

Entities

People

  • J. G. Sessler
  • K. Schroder
  • P. Packman
  • V. Weiss

Organizations

  • Syracuse University

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Crystals
  • Elastic Properties
  • Electron Microscopes
  • Energy
  • Equations
  • Geometry
  • Materials
  • Mechanical Properties
  • Mechanics
  • Microscopes
  • Optical Materials
  • Plastic Deformation
  • Stress Concentration
  • Stresses
  • Surface Properties
  • Titanium
  • Yield Strength

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Reinforced Composite Materials
  • Surface Engineering/Surface Coating Technology.