Effect of Gas Bubbles on the Plastic Zone around a Crack Tip.

Abstract

During the loading of a crack edge dislocations are emitted from the crack tip forming a plastic zone. The presence of gas bubbles near the crack tip can change the plastic zone size and location drastically. A detailed study of the force field on an edge dislocation due to the crack load and gas bubbles allows for the determination of the plastic zone as a function of the inclination angle. The dislocation distribution along the plastic zone is found from force equilibrium considerations. Due to the presence of gas bubbles a shrinking and repulsion of the plastic zone from the crack tip is noticed. This process indicates the material embrittlement. The dislocation free zone (DFZ) near the crack tip grows. This embrittlement can become crucial in material design for fusion applications. Keywords: Cracking(Fracturing); Strength(mechanics); Stress analysis; Stress strain relations; Stress testing; Tensile stress; Fusion reactors; Nuclear reactors.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1987
Accession Number
ADA181001

Entities

People

  • A. C. Eringen
  • Guido D. Dhondt

Organizations

  • Princeton University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Cartesian Coordinates
  • Crack Tips
  • Cracks
  • Dislocations
  • Electron Microscopes
  • Embrittlement
  • Equations
  • Integral Equations
  • Integrals
  • Materials
  • Mechanics
  • Nuclear Fusion
  • Nuclear Reactions
  • Nuclear Reactors
  • Shear Stresses
  • Stress Strain Relations
  • Stresses

Fields of Study

  • Engineering

Readers

  • Combustion science or combustion engineering.
  • Materials Science (Mechanical Engineering).
  • Materials Science and Engineering.