Influence of Microcracking on Shear Localization
Publication: Journal of Engineering Mechanics
Volume 137, Issue 10
Abstract
This work examines the influence of microcracking on a material’s tendency to shear localize under compressive loading. A two-dimensional (2D) finite-element framework with explicit crack representation using cohesive-element methodologies is employed. The influence of microcracking is examined by taking the fracture toughness of the cohesive elements as a free parameter. The simulations suggest that an optimum fracture toughness exists for promoting shear localization. This value corresponds to the limiting mode I fracture toughness, below which microscopic material defects lead to brittle compressive failure, as opposed to shear localization. While in the presence of confinement, this value is shown to be close to zero; in the absence of confinement, it is computed to be 28% of the shear band toughness for the specific case of ultrafine-grained tungsten. More generally, it is found that the ratio of mode I fracture toughness to shear band toughness provides a crude indicator for predicting whether material defects are likely to lead to brittle failure or enhanced shear localization.
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Acknowledgments
This work was supported by the Ordnance Materials Branch of the United States Army Research Laboratory under Contract No. UNSPECIFIEDW911 NF-07-D-0001.
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Information
Published In
Journal of Engineering Mechanics
Volume 137 • Issue 10 • October 2011
Pages: 691 - 698
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Jun 8, 2010
Accepted: Apr 4, 2011
Published online: Apr 5, 2011
Published in print: Oct 1, 2011
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