The Effects of Surface Layer on Plastic Deformation and Crack Propagation

Abstract

A change in proportional limit after cycling was observed for aluminum 2014-T6. Cycling below the endurance limit increases the proportional limit. The etch pit distribution of dislocations in Fe-3Si steel was investigated. The threshold stress for the appearance of slip steps in untreated and SSLE treated specimens of aluminum 2014-T6 was determined. The percentage of grains deformed in specimens of aluminum 2014-T6 which are stressed to various values was observed. The effect of SSLE treatment on the threshold stress intensity for 4130 steel was established. A diametral gage to measure the surface layer stress of notched specimens was manufactured.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1972
Accession Number
AD0737276

Entities

People

  • Avinash Kumar
  • I. R. Kramer

Organizations

  • Martin Marietta

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aluminum
  • Colorado
  • Continents
  • Contracts
  • Corporations
  • Crack Propagation
  • Cracks
  • Crystals
  • Massachusetts
  • Materials
  • Mechanics
  • Security
  • Single Crystals
  • Stresses
  • Titanium
  • United States
  • United States Government

Readers

  • Materials Science (Mechanical Engineering).
  • Thin Film Deposition Science.