Accession Number : AD0848291

Title :   The Cagnaird Method for Investigating Edge Effects in the High-Explosive Simulation Technique (Hest), Project Hest Test V.

Descriptive Note : Rept for Jan-Jun 68,

Corporate Author : AGBABIAN-JACOBSEN ASSOCIATES LOS ANGELES CA

Personal Author(s) : Lee, L. C. ; Malthan, J. A.

Report Date : FEB 1969

Pagination or Media Count : 157

Abstract : The physical geometry of the HEST cavity introduces peculiarities which are not normally part of an idealized nuclear event. This study is limited to an examination of the effects caused by the finite dimensions of the loaded area (otherwise termed the HEST edge effects). The HEST configuration is idealized as a homogeneous isotropic elastic semi-infinite half-space loaded by a traveling pressure pulse in a buried rectangular cavity. The Cagnaird method is used to provide the half-space response as a superposition of closed-form solutions for the linear two-dimensional problem of a single spherical source. The HEST edge effects are studied in detail by comparing the half-space response of the simulated HEST load to that of an enlarged load cavity, with part or all edge effects excluded. The study shows that the principal effect of the cavity edges is to produce outward horizontal motions beneath the test cavity. Cross-axis coupling, defined as the vertical and along-the-edge motions induced by this outward motion, is weak and seems to suggest that two-dimensional plane strain calculations may be realistic, particularly at subcavity locations away from the edges. (Author)

Descriptors :   (*NUCLEAR EXPLOSIONS, DATA PROCESSING), BLAST, SURFACE BURST, SHOCK WAVES, PROPAGATION, LOADS(FORCES), SOILS, MATHEMATICAL MODELS, COMPUTER PROGRAMMING, COMPUTER PROGRAMS, MOTION, SIMULATION.

Subject Categories : Computer Programming and Software

Distribution Statement : APPROVED FOR PUBLIC RELEASE