Accession Number : ADA181012

Title :   Modeling of Shockless Acceleration of Thin Plates Using a Tracked Random Choice Method.

Descriptive Note : Technical summary rept.,

Corporate Author : WISCONSIN UNIV-MADISON MATHEMATICS RESEARCH CENTER

Personal Author(s) : Plohr,Bradley J

PDF Url : ADA181012

Report Date : Feb 1987

Pagination or Media Count : 43

Abstract : A method for accelerating thin metallic plates to hypervelocities has been proposed by G. McCall. In this method a shock in a propellant generates a strong expansion wave that smoothly accelerates the plate. We have studied the hydrodynamics of this process in one dimension, both analytically and computationally. The metal was modeled as a stiffened gas, and the corresponding Riemann problem was solved. The asymptotic behavior of the solution was determined analytically. The one-dimensional random choice method, modified so that material boundaries are tracked and the spatial mesh is refined locally, was used to compute the flow, comparison with the for within the accelerating plate were accurately resolved, so that possible structural demate to the plate could be evaluated. Keywords: Computation; Numerical methods and procedures; Shock waves; Thermodynamic models; flow; Tungsten plates.

Descriptors :   *SHOCK WAVES, *ACCELERATION, *METAL PLATES, HYPERVELOCITY GUNS, EQUATIONS OF STATE, HYDRODYNAMIC CODES, ASYMPTOTIC SERIES, BOUNDARIES, EXPANSION, GASES, HYDRODYNAMICS, MATERIALS, MESH, MODELS, NUMERICAL METHODS AND PROCEDURES, ONE DIMENSIONAL, SHOCK, SPATIAL DISTRIBUTION, STIFFNESS, THERMODYNAMICS, THINNESS, TRACKING, TUNGSTEN, WAVES

Subject Categories : Ballistics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE