Effect of crack blunting on the ductile-brittle response of crystalline materials Conference Paper

abstract

• AbstractWe propose a self-consistent criterion for crack propagation versus dislocation emission, taking into account the effects of crack-tip blunting. Continuum concepts are used to evaluate the evolving competition between crack advance and dislocation nucleation as a function of crack- tip curvature. This framework is used to classify crystals as intrinsically ductile or brittle in terms of the unstable stacking energy, the surface energy, and the peak cohesive stresses achieved during opening and shear of the atomic planes. We find that ductile-brittle criteria based on the assumption that the crack is ideally sharp capture only two of the four possible fracture regimes. One implication of the present analysis is that a crack may initially emit dislocations, only to reinitiate cleavage upon reaching a sufficiently blunted crack-tip geometry.

authors

• Lipkin, Don

published proceedings

• FRACTURE AND DUCTILE VS. BRITTLE BEHAVIOR-THEORY, MODELLING AND EXPERIMENT

author list (cited authors)

• Lipkin, D. M., Beltz, G. E., & Fischer, L. L.

citation count

• 1

complete list of authors

• Lipkin, DM||Beltz, GE||Fischer, LL

publication date

• 1999

publisher

• Springer Nature  Publisher

published in

• MRS Online Proceedings Library  Journal

keywords

• 34 Chemical Sciences
• 40 Engineering
• 4016 Materials Engineering

Digital Object Identifier (DOI)

• 10.1557/proc-539-49

International Standard Book Number (ISBN) 10

• 1-55899-445-9

start page

• 49

end page

• 56

volume

• 539

URL

• http://dx.doi.org/10.1557/proc-539-49