Fragmentation and Constitutive Response of Tailored Mesostructured Aluminum-Based Inert and Reactive Compacts

ORAL

Abstract

The fragmentation and constitutive response of tailored aluminum-based compacts is examined under dynamic conditions. Mesostructured compacts with tailored interfaces between the powders (with sizes of 40, 100, and 400 $\mu $m) were produced by swaging. In addition to these, reactive Ni-Al mixtures were prepared by the same technique; the Ni/Al layer thicknesses within the powders were varied to control the reaction rate between Ni and Al. The fragmentation produced in the explosively-driven rings expanded at a velocity of approximately 100 m/s was captured by high-speed photography. The fragment size distributions obtained varied widely and correlated with the interfacial strength of the compacts as well as with powder size. Experimental results are compared with fragmentation theories to characterize the behavior of reactive powders based on material mesostructure.

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Authors

  • Andrew Marquez

    University of California San Diego

  • Christopher Braithwaite

    Fracture and Shock Physics, SMF Group, Department of Physics, Cavendish Laboratory, J J Thomson, Avenue, Cambridge CB3 0HE, UK, Cambridge University, Fracture and Shock Physics Group: Cavendish Laboratory

  • Timothy Weihs

    Johns Hopkins University

  • Nick Krywopusk

    Johns Hopkins University

  • David Gibbins

    Johns Hopkins University

  • Marc Meyers

    University of California, San Diego, La Jolla, CA 92093, USA, University of California, San Diego, University of California San Diego