Session MF: Shock and Blast Waves

8:00 AM–10:10 AM, Tuesday, November 25, 2008
Room: 003B

Chair: Mark Short, Los Alamos National Laboratory

Abstract ID: BAPS.2008.DFD.MF.8

Abstract: MF.00008 : Blast-Induced Pressure Fields Beneath a Military Helmet for Non-Lethal Threats

9:31 AM–9:44 AM

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  David Mott
    (Naval Research Laboratory)

  Douglas Schwer
    (Naval Research Laboratory)

  Theodore Young
    (Naval Research Laboratory)

  Jeffrey Levine
    (Allen-Vanguard Corp. (Med-Eng Systems))

  Jean-Philippe Dionne
    (Allen-Vanguard Corp. (Med-Eng Systems))

  Aris Makris
    (Allen-Vanguard Corp. (Med-Eng Systems))

  Graham Hubler
    (Naval Research Laboratory)

Coordinated experiments and numerical simulations investigated the pressure field surrounding a head with a helmet subjected to a blast wave typical of injurious but non-lethal threats. Experiments were conducted with C4 explosive charges ranging from 0.75 kg to 5 kg, and two anthropomorphic test mannequins (Hybrid III) located 3 m from the explosive. Experimental diagnostics included pressure sensors mounted at selected locations around each mannequin's head and in the free-field. Numerical modeling was done using a two-step approach. First, the blast and ground reflection were computed using a multi-component, reacting flow model. Second, the results were used to specify the boundary conditions for a three-dimensional unsteady simulation of the head-helmet complex subjected to a blast wave. The helmet was shown to provide protection against primary blast injury both in computations and experiments. The simulations indicate that pressure waves entering the gap between the helmet and head focus on the side of the head away from the blast and produce pressures comparable to that experienced on unprotected surfaces subjected to the blast.

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