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The structure of controlled shear bands in dynamically deformed reactive mixtures

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Abstract

The structure of controlled high-strain-rate shear bands generated in heterogeneous reactive porous materials (Nb + Si, Mo + Si + MoSi2) has been investigated using axially symmetric experimental configurations in which the source of energy is the detonation of low velocity explosives. The deformation was highly localized, with profuse formation of shear bands, which have thicknesses of 5 to 20 μm. The experimental method generated overall strains up to 100 and strain rates\(\dot \gamma \) of approximately 107 s-1. Changes in particle morphology, melting, and regions of partial reaction on three different length scales were observed. The shear band thickness is smaller than the initial characteristic particle size of the porous mixture (≤44 μm), ensuring a cooling time of the deformed material on the same order of magnitude as the deformation time (10-5 s). In the shear localization regions, two characteristic phenomena were observed: (a) a shear fracture subdividing the Nb particles into thin parallel layers and (b) the formation of vortices. A mechanism for the reaction inside the shear bands is proposed, and an expression for the largest size of chemical products as a function of shear deformation is obtained.

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Authors and Affiliations

  1. Institute for Mechanics and Materials, Department of Applied Mechanics and Engineering Sciences, University of California, 92093, San Diego, CA

    M. A. Meyers (Professor), H. C. Chen (Graduate Student) & J. C. LaSalvia (Post-Doctoral Fellow)

Authors
  1. V. F. Nesterenko
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  2. M. A. Meyers
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  3. H. C. Chen
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  4. J. C. LaSalvia
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Additional information

Professor, on leave from the Lavrentyev Institute of Hydrodynamics, Russian Academy of Sciences, Novosibirsk, 630090, Russia.

This article is based on a presentation made in the symposium “Dynamic Behavior of Materials,” presented at the 1994 Fall Meeting of TMS/ASM in Rosemont, Illinois, October 3-5, 1994, under the auspices of the TMS-SMD Mechanical Metallurgy Committee and the ASM-MSD Flow and Fracture Committee.

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Nesterenko, V.F., Meyers, M.A., Chen, H.C. et al. The structure of controlled shear bands in dynamically deformed reactive mixtures. Metall Mater Trans A 26, 2511–2519 (1995). https://doi.org/10.1007/BF02669409

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