A Self-Consistent Model For Directional Dependence Of Crack Growth

Zhang, X., Jeffrey, R. and Mai, Y. W. (2004). A Self-Consistent Model For Directional Dependence Of Crack Growth. In: Atrens, A., Boland, J. N., Clegg, R. and Griffiths, J. R. Structural Integrity and Fracture International Conference (SIF'04), Brisbane, Australia, (407-413). 26-29 September 2004.

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Author Zhang, X.
Jeffrey, R.
Mai, Y. W.
Title of paper A Self-Consistent Model For Directional Dependence Of Crack Growth
Conference Paper Type Fully Published Paper
Conference name Structural Integrity and Fracture International Conference (SIF'04)
Conference location Brisbane, Australia
Conference dates 26-29 September 2004
Editor Atrens, A.
Boland, J. N.
Clegg, R.
Griffiths, J. R.
Publication date 2004
Start page 407
End page 413
Abstract/Summary Fracture growth is considered as the competition between cleavage and dislocation self-organization in elastic-plastic solids. A self-consistent model is proposed to bridge the responses at relevant length scales, an elastic enclave in the immediate vicinity of crack tip, an array of disclination dipoles and macroscopic plastic deformation. The directional dependence of crack growth is studied. In the continuum limit, the flow stress is expressed by a spatial coupling in terms of a second-order gradient of the rotation strength of disclination dipoles. An estimate of the core size and the crack-tip shielding ratio is given by identification of the macroscopic plastic fields, the elastic field and the constitutive flow stress from the micromechanics consideration, on the boundary of elastic core. Strong dependence of apparent fracture toughness on the intrinsic surface energy and the ductile-to-brittle transition are examined.
Subjects 290801 Structural Engineering
Keyword crack growth
direction
disclination dipole
kink
core size
shielding ratio
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Conference Paper
Sub-type: Fully Published Paper
Collection: School of Mechanical & Mining Engineering Publications
 
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Created: Fri, 24 Dec 2004, 10:00:00 EST by Lucy Peachey on behalf of Research Management Office