Bomb penetration tests, Fort Churchill, Canada
Livingston, Clifton W.
Technical ReportSummary: Inert mortar shells and inert general purpose, semi-armor-piercing, and armor-piercing bombs were dropped on frozen ground (glacial till) near Fort Churchill, Canada during the 1956-57 winter to observe projectile penetration and determine the feasibility of forming trenches and foxholes in frozen ground with aerial bombs. An analogy is drawn between plastic deformation and fluid flow, and an equation is derived which expresses the path length of a bomb penetrating a solid in terms of the weight and diam. of the bomb, the density and unit weight of the material penetrated, and two coefficients which are related to the material and its resistance to bomb penetration. Using the plastic deformation equation and the postulated model law for impact, equations are derived for predicting the type of fracturing, the degree of fragmentation, and the shape of the underground trajectory. None of the bombs presently available meets the requirements for making trenches and foxholes in frozen ground. Design characteristics are given for a series of new bombs, the FH series (for foxholes), which are expected to have a greater ballistic coefficient, less bombing error, and greater penetration. NOTE: This file is very large. Allow your browser several minutes to download the file.
U.S. Army Snow, Ice, and Permafrost Research Establishment.Engineer Research and Development Center (U.S.)
Frozen ground; Frozen soils; Permafrost; Muskeg; Projectile penetration; Bombing; Bombs; Explosives; Explosive effects; Blasting; Blast effects; Subsurface trajectories; Fort Churchill, Canada
SIPRE report ; 71.
Approved for public release; distribution is unlimited.