Dislocation-free zone at the crack tip

Journal Article · Fri Jan 01 04:00:00 EST 1982 · Scr. Metall.; (United States)

DOI:https://doi.org/10.1016/0036-9748(82)90382-9· OSTI ID:6510707

Dai, S H; Li, J C.M.

The dislocation-free zone recently observed at the crack tip increases with the difficulty of dislocation emission from the crack tip and with the decreasing of lattice friction for the motion of dislocations. The critical conditions for zone formation were obtained. The results suggest that a dislocation-free zone does not imply purely elastic behavior for crack propagation since dislocations still can be emitted from the crack. However, the results do suggest that in addition to dislocation motion in the lattice, dislocation generation at the crack tip may be a very important parameter affecting the brittleness of the material.

• Research Organization: Univ. of Rochester, NY
• OSTI ID: 6510707
• Journal Information: Scr. Metall.; (United States), Journal Name: Scr. Metall.; (United States) Vol. 16:2; ISSN SCRMB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
BRITTLENESS
CRACK PROPAGATION
CRACKS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
DISTRIBUTION
ELEMENTS
LINE DEFECTS
MECHANICAL PROPERTIES
METALS
MOTION
NUMERICAL SOLUTION
STRESSES