Dislocation emission from an elliptically blunted crack tip with surface effects

• Published in: Physica. B, Condensed matter Vol. 404; no. 20; pp. 3421 - 3424
• Main Authors: Fang, Q.H., Liu, Y., Liu, Y.W., Huang, B.Y.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 01-11-2009; Elsevier
• Subjects: Blunt crack; Condensed matter; Condensed matter: structure, mechanical and thermal properties; Cracks; Defects and impurities in crystals; microstructure; Dislocation emission; Dislocations; Edge dislocation; Emission; Exact sciences and technology; Indirect evidence of dislocations and other defects (resistivity, slip, creep, strains, internal friction, epr, nmr, etc.); Nanocomposites; Nanomaterials; Nanostructure; Physics; Stress intensity factor; Structure of solids and liquids; crystallography; Surface stress; 68.35.Gy; 61.72.Lk; 62.20.D; Surface stress; 62.20.mt; Edge dislocation; Blunt crack; Dislocation emission; Blunt end; Surface stresses; Surface effect; Edge dislocations; Stress intensity factors; Crack tip; Surface cracks
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/j.physb.2009.05.025

The explicit expressions for critical stress intensity factors are derived for edge dislocation emission from an elliptically blunt crack with surface effects under mode I and mode II loadings. The influence of surface effects on dislocation emission criterion is analyzed. The result indicates the impact of the surface stress becomes remarkable for nanoscale blunted cracks and some particular materials, which cannot only affect the value of the critical stress intensity factors for dislocation emission, but also alter the emission angle.