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Flow localization in shear deformation of void-containing and void-free solids

✍ Scribed by B. Dodd; A.G. Atkins

Publisher
Elsevier Science
Year
1983
Weight
756 KB
Volume
31
Category
Article
ISSN
0001-6160

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✦ Synopsis

Geometrical softening is possible in shear if the solid contains voids, the flow becoming localized between the voids. Flow localization in shear may also be caused by quasi-adiabatic thermal softening along shear bands. Experimental instabilities may result from either cause, depending on the void nucleation strain, volume fraction of voids, pressure dependence of hole growth rates, the work hardening index and a characteristic material parameter M reflecting the thermomechanical properties of the solid. Second instabilities arc possible where the two causes act together. It is shown that data on shear strain flow instabilities which are considerably over-estimated by thermoplastic theory are readily explained by isothermal geometric softening in the presence of voids.

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