Predicting Fully Plastic Mode II Crack Growth from an Asymmetric Defect.

Abstract

Asymmetrically cracked specimens fail with considerably less ductility than symmetrically cracked ones, due to the crack progressing along a shear band into pre-damaged material. A formulation for the accumulation of damage ahead of an asymmetic crack is presented, based on strain increments following a power law relation. These results are integrated both numerically and approximately. The crack growth per unit displacement increases approximately as the logarithm of the total crack advance per inclusion spacing, and varies inversely as the critical fracture strain. This provides a basis for predicting large-scale, fully plastic fracture from asymmetric weld defects using small-scale laboratory specimens. Originator-Supplied keywords included: Ductile fracture, Fully plastic, Mixed mode, Crack initiation, Crack growth, Asymmetry, Crack ductility, Weld defects, Shear band, Theory, Experiments, Oblique, and Shear lip.

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Document Details

Document Type
Technical Report
Publication Date
Feb 28, 1985
Accession Number
ADA152227

Entities

People

  • A. H. Slocum
  • F. A. Mcclintock

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Crack Tips
  • Displacement
  • Ductility
  • Engineering
  • Equations
  • Fracture (Mechanics)
  • Hardening
  • Inclusions
  • J Integrals
  • Materials
  • Mechanical Engineering
  • Mechanics
  • Plastic Properties
  • Shear Bands
  • Steady State
  • Strain Hardening
  • Tensile Strength

Readers

  • Materials Science (Mechanical Engineering).

Technology Areas

  • Space