Crack tip dislocations in MgO

Journal Article · Sun Jun 01 04:00:00 EDT 1980 · Scr. Metall.; (United States)

DOI:https://doi.org/10.1016/0036-9748(80)90017-4· OSTI ID:5347700

Majumdar, B S; Burns, S J

Several dislocation free zones were shown at crack tips. It is proposed that these zones are free of dislocations because of image forces with the stress free crack surfaces. Dislocations that are nucleated at the crack tip would be looped around or on one side of the crack tip. When the crack moves these dislocations would be annihilated by the crack tip at distances less that r/sub 0//4. The material between r/sub 0/ and the crack tip is elastic because it is dislocation free - which is even a stronger condition than the recent fracture theories require.

• Research Organization: Univ. of Rochester, NY
• DOE Contract Number: AS02-76ER02422
• OSTI ID: 5347700
• Journal Information: Scr. Metall.; (United States), Journal Name: Scr. Metall.; (United States) Vol. 14:6; ISSN SCRMB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
CRACKS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
FRACTURE PROPERTIES
LINE DEFECTS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MECHANICAL PROPERTIES
NUCLEATION
OXIDES
OXYGEN COMPOUNDS