SYMPOSIA PAPER Published: 01 January 1989

Results on the Influence of Crack-Tip Plasticity During Dynamic Crack Growth


Dynamic fracture processes in structural materials are often described in terms of the relationship between a measure of the crack driving force and the crack-tip speed. In this paper, ongoing research directed toward establishing a basis for such a relationship in terms of crack-tip plastic fields is described. In particular, the role of material inertia on a small scale as it influences the perceived fracture resistance of a rate-independent material is discussed. Also, the influence of material strain rate sensitivity on the development of crack-tip plastic deformations, and the implications for cleavage propagation and arrest in a material that can undergo a fracture mechanism transition is considered. The discussion is concluded with mention of a few outstanding problems in the study of dynamic fracture, including some recent experimental evidence that the traditional crack-tip characterization viewpoint of fracture mechanics may be inadequate under very high rate loading conditions.

Author Information

Freund, LB
Brown University, Providence, RI
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Developed by Committee: E08
Pages: 84–97
DOI: 10.1520/STP18821S
ISBN-EB: 978-0-8031-5081-2
ISBN-13: 978-0-8031-1250-6