Crack Growth by Concentrated Plastic Flow.

Abstract

A criterion that test specimens be large enough for valid fracture prediction from J sub Ic tests appears to be that the stress at the half-ligament dimension, calculated from J sub Ic and the Hutchinson-Rice-Rosengren singularity, be no more than 1.05 to 1.1 times the yield strength. For smaller specimens, the J-integral varied linearly with ligament size and was surprisingly similar for single and double grooved specimens. On the other hand, fully plastic triaxiality was shown to be very important in welded plates of A-36 steel, in which the transition temperature for brittle crack propagation was raised 40 K above the Charpy value by the triaxiality due to simulated cracks on both sides of the plate. This may also be of interest in fragmentation.

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Document Details

Document Type
Technical Report
Publication Date
Jun 28, 1978
Accession Number
ADA056723

Entities

People

  • Frank A. Mcclintock

Organizations

  • Massachusetts Institute of Technology

Tags

DTIC Thesaurus Topics

  • Aluminum Alloys
  • Base Metal
  • Chemistry
  • Creep
  • Finite Element Analysis
  • J Integrals
  • Materials
  • Mechanical Engineering
  • Mechanical Properties
  • Mechanics
  • Plastic Flow
  • Strain Hardening
  • Stress Strain Relations
  • Stresses
  • Tensile Strength
  • Transition Temperature
  • Yield Strength

Readers

  • Materials Science (Mechanical Engineering).