Shear Localization: A Historical Overview |
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Authors: | SM Walley |
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Affiliation: | (1) Fracture and Shock Physics Section of the Surfaces, Microstructure, and Fracture Group (formerly Physics and Chemistry of Solids), Cavendish Laboratory, Cambridge, CB3 0HE, United Kingdom |
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Abstract: | This review presents a historical approach to the development of understanding of the shear localization phenomenon in materials,
concentrating particularly on impact. Deformation localization under these conditions is widely referred to as adiabatic shear
banding as the timescales are such that the distances heat can diffuse are small. Dimensional analysis shows that the phenomenon
is ultimately intractable to linear algebraic analysis, as it is a coupled mechanical/thermal problem. However, various linear
analyses from the literature are discussed along with their limitations as they shed light on the influence of various material
properties. The aim of gaining understanding is to be able to engineer materials with the required localization (and hence
fracture) characteristics. The most advanced analyses show that shear band widths and spacings are determined by optimizing
the diffusion of heat and inertia. Because inertia is involved, the phenomenon cannot be understood simply as a materials
property: geometry and structure must play a role.
This article is based on a presentation made in the symposium entitled “Dynamic Behavior of Materials,” which occurred during
the TMS Annual Meeting and Exhibition, February 25–March 1, 2007 in Orlando, Florida, under the auspices of The Minerals,
Metals and Materials Society, TMS Structural Materials Division, and TMS/ASM Mechanical Behavior of Materials Committee. |
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