Dynamic simulation of crack propagation with dislocation emission and migration

Book · Tue Dec 31 04:00:00 EST 1996

OSTI ID:488964

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

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

As is well known, crack propagation and dislocation plasticity are intimately linked in metallic alloys. Here, the authors present a simulation procedure for fracture that self-consistently accounts for dislocation emission, dislocation migration and crack growth. The authors 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.

• Sponsoring Organization: USDOE, Washington, DC (United States)
• OSTI ID: 488964
• Report Number(s): CONF-951155--; ISBN 1-55899-311-8
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
CALCULATION METHODS
COMPUTERIZED SIMULATION
CRACK PROPAGATION
CRYSTAL DEFECTS
DISLOCATIONS
FRACTURE MECHANICS
MICROSTRUCTURE
THEORETICAL DATA