Accession Number:

ADA030238

Title:

Effects of Depth of Burst and Geology on Calculated SBM Peak Stress Environments.

Descriptive Note:

Summary rept. Jul-Aug 76 on Phase 1,

Corporate Author:

ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS

Report Date:

1976-09-01

Pagination or Media Count:

39.0

Abstract:

A parametric study was conducted to obtain a first-order numerical assessment of the relative effects of depth of burst DOB and geology on the peak stress environments achievable with a 1-kt Shallow Burst Munition SBM. This paper presents a summary of the calculation results a comprehensive technical report will be published in early FY 77. Ten idealized ground shock problems were calculated using the two-dimensional, axisymmetric, small-strain, finite-difference LAYER code. The run matrix involved two DOBs 1 m and 3 m and three diverse geologic materials a dry soil, a wet soil, and a bedrock material. These earth media were modeled with a simplified version of the cap-type constitutive relation. Eight of the calculations were driven by combined airblast- and direct-induced AI and DI loadings the remainder were drived by airblast loadings only. The AI drivers were developed from SBM airblast calculation data furnished by the Air Force Weapons Laboratory. The DI drivers pressurized pillboxes were developed from SBM airblast source calculation data furnished by the Lawrence Livermore Laboratory. The study showed that, within the SBM DOB range, 1 direct-induced ground shock effects predominate over airblast-induced ground shock effects, 2 there is little sensitivity to DOB between 1 and 3 m, and 3 peak stresses at a given range are strongly dependent on whether the near-surface soils are wet or dry, with wet sites producing much higher stresses. Author

Subject Categories:

  • Geology, Geochemistry and Mineralogy
  • Numerical Mathematics
  • Explosions

Distribution Statement:

APPROVED FOR PUBLIC RELEASE