Abstract
Shear bands formation in collapsing thick walled cylinders occurs in a spontaneous manner. The advantage of examining spontaneous, as opposed to forced shear localization, is that it highlights the inherent susceptibility of the material to adiabatic shear banding without prescribed geometrical constraints. The Thick-Walled Cylinder technique (TWC) provides a controllable and repeatable technique to create and study multiple adiabatic shear bands. The technique, reported in the literature uses an explosive cylinder to create the driving force, collapsing the cylindrical sample. Recently, we developed an electro-magnetic set-up using a pulsed current generator to provide the collapsing force, replacing the use of explosives. Using this platform we examined the shear band evolution at different stages of formation in 7 metallic alloys, spanning a wide range of strength and failure properties. We examined the number of shear bands and spacing between them for the different materials to try and figure out what controls these parameters. The examination of the different materials enabled us to better comprehend the mechanisms which control the spatial distribution of multiple shear bands in this geometry. The results of these tests are discussed and compared to explosively driven collapsing TWC results in the literature and to existing analytical models for spontaneous adiabatic shear localization.
Highlights
The initiation and growth of shear bands have been extensively studied since the pioneering work of Zener and Hollomon [1], using various experimental techniques with which the formation of a shear band is well defined
We normalized the results in each specimen to the geometry upon initiation and used this definition for the explosively driven thick wall cylinder (ED-TWC) specimens reported in the literature as well
We measured and compared the shear band spacing in the different materials and compared them with results obtained in larger scaled, explosively driven tests reported in the literature and to theoreical predictive models for spacing
Summary
The initiation and growth of shear bands have been extensively studied since the pioneering work of Zener and Hollomon [1], using various experimental techniques with which the formation of a shear band is well defined. The common basis for all of these well-used techniques is that they all refer to a state of forced shear localization In such cases, shear bands are formed in well-defined regions, dictated by the specimen geometry, parallel to the direction of the maximum shearing load. We introduced an electromagnetically driven version of the TWC technique [14, 15], using a pulsed current generator This method has the advantage that it is highly controllable and somewhat simpler than the use of explosives or alternatively, the use of a large scale Mega-Joule energy facility. In a TWC experiment, one can measure the number, spacing and length of the spontaneously initiated We further compared the results with theoretical models in the literature for evaluating the spacing between shear bands
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