Dynamic simulation of crack propagation with dislocation emission and migration

Conference · Sun Dec 01 04:00:00 EST 1996

OSTI ID:400611

Zacharopoulos, N; Srolovitz, D J ^[1]; LeSar, R A ^[2]

---

1. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Materials Science and Engineering
2. Los Alamos National Lab., NM (United States)

The authors present a simulation procedure for fracture that self-consistently accounts for dislocation emission, dislocation migration and crack growth. They find that the dislocation microstructure in front of the crack tip is highly organized and shows a complex temporal-spatial evolution. The final dislocation microstructure and the number of emitted dislocations immediately proceeding fracture varies rapidly with the loading rate. For high loading rates, fracture occurs at smaller loads with increasing loading rate. However, the load at fracture shows a maximum with respect to loading rates.

• OSTI ID: 400611
• Report Number(s): CONF-951155--; ISBN 1-55899-312-6
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
CRACK PROPAGATION
CRACKS
DISLOCATIONS
FRACTURE MECHANICS
LOADING RATE
MATHEMATICAL MODELS
PLASTICITY
STRAINS
STRESS INTENSITY FACTORS
STRESSES
SURFACE ENERGY
TWO-DIMENSIONAL CALCULATIONS
VELOCITY