SYMPOSIA PAPER Published: 01 January 1994

Dislocation Emission and Dynamics Under the Stress Singularity at the Crack Tip and Its Application to the Dynamic Loading Effect on Fracture Toughness


In previous work, computer simulation of dislocation emission and motion was carried out considering the stress singularity near the crack tip. It was found that there is a region in which no dislocation exists along the slip plane near the stressed source, namely, a dislocation free zone (DFZ), and that there is an inverse pileup of dislocations against the tip of this DFZ. A formula was obtained correlating the maximum dislocation density with the DFZ length.

Based on those results, an evaluation has now been attempted for fracture toughness within the brittle-ductile transition range of steel. The effect of dynamic loading on the fracture toughness and trigger point observed in the experimental results reported in the literature is explained.

Author Information

Yokobori, AT
Tohoku University, Sendai, Japan
Iwadate, T
Japan Steel Works Ltd., Hokkaido, Japan
Isogai, T
Teikyo University, Tochigi, Japan
Price: $25.00
Contact Sales
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Developed by Committee: E08
Pages: 464–477
DOI: 10.1520/STP13721S
ISBN-EB: 978-0-8031-5270-0
ISBN-13: 978-0-8031-1990-1