Crack tip shielding--an elastic theory of dislocations and dislocation arrays near a sharp crack

Journal Article · Thu Jan 01 04:00:00 EST 1981 · Acta Metall.; (United States)

DOI:https://doi.org/10.1016/0001-6160(81)90139-5· OSTI ID:5465173

Majumdar, B S; Burns, S J

An elastic solution has been found for a screw dislocation near a crack in the absence of any external stresses. The dislocation produces a stress intensity factor on the crack even without external stresses. The stress intensity factor at the crack tip plus the dislocation's contribution to the stress intensity factor add to the stress intensity factor due to the applied stresses. Also the interaction between the crack and dislocations, and between dislocations in the presence of the crack can be solved by simply considering the associated stress intensity factors at the crack tip. Several additional solutions derived are two dislocations at the crack tip, a dislocation off the crack plane, a circle of dislocations around the crack tip and a finite length crack with external stresses.

• Research Organization: Univ. of Rochester, NY
• DOE Contract Number: AS02-76ER02422
• OSTI ID: 5465173
• Journal Information: Acta Metall.; (United States), Journal Name: Acta Metall.; (United States) Vol. 29; ISSN AMETA
• Country of Publication: United States
• Language: English

Related Subjects

656000* -- Condensed Matter Physics
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRACK PROPAGATION
CRACKS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
ELASTICITY
FRACTURE PROPERTIES
LINE DEFECTS
MECHANICAL PROPERTIES
SCREW DISLOCATIONS
STRESS INTENSITY FACTORS
TENSILE PROPERTIES