Dynamic shear deformation in high purity iron |

Issue		Volume 2, 2009 DYMAT 2009 - 9th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading


Page(s)		977 - 983
Section		Micro-Structural Effects
DOI		10.1051/dymat/2009137
Published online		15 September 2009

DYMAT 2009 (2009) 977-983
DOI: 10.1051/dymat/2009137

Dynamic shear deformation in high purity iron

E. Cerreta¹, J. Bingert¹, C. Trujillo¹, M. Lopez¹, C. Bronkhorst², B. Hansen² and G. Gray¹

¹ Los Alamos National Laboratory, MST-8/MS G755, Los Alamos, NM 87545, USA
² Los Alamos National Laboratory, T-3/MS B216, Los Alamos, NM 87545, USA

Published online: 15 September 2009

Abstract
The forced shear test specimen, first developed by Meyer et al. [Meyer L. et al., Critical Adiabatic Shear Strength of Low Alloyed Steel Under Compressive Loading, Metallurgical Applications of Shock Wave and High Strain Rate Phenomena (Marcel Decker, 1986), 657; Hartmann K. et al., Metallurgical Effects on Impact Loaded Materials, Shock Waves and High Strain rate Phenomena in Metals (Plenum, 1981), 325-337.], has been utilized in a number of studies. While the geometry of this specimen does not allow for the microstructure to exactly define the location of shear band formation and the overall mechanical response of a specimen is highly sensitive to the geometry utilized, the forced shear specimen is useful for characterizing the influence of parameters such as strain rate, temperature, strain, and load on the microstructural evolution within a shear band. Additionally, many studies have utilized this geometry to advance the understanding of shear band development. In this study, by varying the geometry, specifically the ratio of the inner hole to the outer hat diameter, the dynamic shear localization response of high purity Fe was examined. Post mortem characterization was performed to quantify the width of the localizations and examine the microstructural and textural evolution of shear deformation in a bcc metal. Increased instability in mechanical response is strongly linked with development of enhanced intergranular misorientations, high angle boundaries, and classical shear textures characterized through orientation distribution functions.

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