Combined macroscopic and microscopic approach to the fracture of metals. Technical progress report, July 1976--June 1977

Technical Report · Fri Jul 01 04:00:00 EDT 1977

DOI:https://doi.org/10.2172/7286090· OSTI ID:7286090

Gurland, J; Rice, J R; Asaro, R J; Needleman, A

The work includes the completion of a comprehensive study of the contributions of dislocation substructures and local stresses at particle interfaces to the strain hardening of dispersion hardened steels, and the presentation of a model of segregant induced embrittlement of grain interfaces. Work was continued on crack initiation at inclusions and on the theory of plastic flow localization. These microscopic effects are discussed in relation to the mechanisms of brittle fracture and ductile rupture of metals and alloys. On a more macroscopic scale, the state of stress and strain associated with the large plastic deformation at a crack tip was further defined based on finite element and slip line calculations, and some preliminary results were obtained by finite element methods for stable crack growth under plane strain conditions. A new finite element method has been developed for fully plastic flow under plane strain conditions.

• Research Organization: Brown Univ., Providence, R.I. (USA). Dept. of Engineering
• Sponsoring Organization: USDOE
• OSTI ID: 7286090
• Report Number(s): COO-3084-53
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CRACKS
CRYSTAL STRUCTURE
DEFORMATION
DISPERSION HARDENING
ELASTICITY
FRACTURE PROPERTIES
GRAIN BOUNDARIES
HARDENING
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
MICROSTRUCTURE
STEELS
STRAIN HARDENING
STRESSES
TENSILE PROPERTIES
THERMOELASTICITY