Analysis of the crack initiation and growth in crystalline materials using discrete dislocations and the modified kitagawa–takahashi diagram

Kuntimaddi Sadananda, Ilaksh Adlakha, Kiran N. Solanki, A. K. Vasudevan

Research output: Contribution to journalArticle

Abstract

Crack growth kinetics in crystalline materials is examined both from the point of continuum mechanics and discrete dislocation dynamics. Kinetics ranging from the Griffith crack to continuous elastic-plastic cracks are analyzed. Initiation and propagation of incipient cracks require very high stresses and appropriate stress gradients. These can be obtained either by pre-existing notches, as is done in a typical American Society of Testing and Materials (ASTM) fatigue and fracture tests, or by in situ generated stress concentrations via dislocation pile-ups. Crack growth kinetics are also examined using the modified Kitagawa–Takahashi diagram to show the role of internal stresses and their gradients needed to sustain continuous crack growth. Incipient crack initiation and growth are also examined using discrete dislocation modeling. The analysis is supported by the experimental data available in the literature.

Original languageEnglish (US)
Article number358
JournalCrystals
Volume10
Issue number5
DOIs
StatePublished - May 2020
Externally publishedYes

Keywords

  • Crack growth
  • Dislocation models
  • Fracture mechanics
  • Internal stresses
  • Kitagawa-takahashi diagram
  • Pile-ups

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Inorganic Chemistry

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