Dislocation-free zone theory of fracture

Conference · Fri Jan 01 04:00:00 EST 1982

OSTI ID:5228772

Chang, S J; Ohr, S M

Recent observations by electron microscopy have shown the presence of a dislocation-free zone (DFZ) between the crack tip and a linear pileup of dislocations in the plastic zone. A singular integral equation was formulated to describe the equilibrium configuration of the dislocations. The distribution function of the dislocations and the stress intensity factor were obtained in terms of elliptic integrals. It was found that the stress intensiy factor is directly related to the length of the DFZ. The formation of the DFZ and the ductile-brittle nature of fracture are discussed based on the mechanism of dislocation emission at the crack tip proposed by Rice and Thomson. 3 figures.

• Research Organization: Oak Ridge National Lab., TN (USA); Union Carbide Corp., Oak Ridge, TN (USA). Computer Sciences Div.
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5228772
• Report Number(s): CONF-820614-5; ON: DE82017402
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
ELECTRON MICROSCOPY
ELEMENTS
FAILURES
FRACTURE MECHANICS
FRACTURES
LINE DEFECTS
MECHANICS
METALS
MICROSCOPY
RELAXATION
STRESS INTENSITY FACTORS
STRESS RELAXATION