Fracture Toughness of Fatigue-Damaged Steel Specimens,

Abstract

The plane strain fracture toughness K sub Ic of a material is used to describe the crack tip conditions required for unstable growth of a crack, and is used extensively in designing metallic components and in assessing the severity of pre-existing defects. There are many situations in service, however, where the crack tip stress conditions immediately prior to unstable crack growth are not identical to those in a standard fracture toughness test specimen. This report examines the fracture toughness of high-quality gun steel, and describes conditions under which the fatigue pre-cracking levels specified for K sub Ic tests may produce unreasonably high values of K sub Ic, leading to an increased possibility of in-service fracture of components designed using these values. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1979
Accession Number
ADA081841

Entities

People

  • Graham Clark

Organizations

  • Defence Science and Technology Group

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Alloys
  • Australia
  • Crack Tips
  • Cracks
  • Engineering
  • Fatigue Cracking
  • Ferrium
  • Fracture (Mechanics)
  • Gun Barrels
  • Low Alloy Steels
  • Materials
  • Mechanics
  • Security
  • Standards
  • Steel
  • Test Methods
  • Toughness

Readers

  • Materials Science (Mechanical Engineering).
  • Structural Health Monitoring of Composite Structures.
  • Systems Analysis and Design