US Government as Represented by the Secretary of the Army

Daniel R Scheffler

William P Walters

Richard L Summers

Christopher S Meyer

Jason C Angel

Timothy G Farrand

Brett R Sorensen

Cyril L Williams

A cannon projectile having an elongated body with a plurality of elongated and circumferentially spaced segments. At least one tether is attached to at least one end of the segments to hold the segments together. A deployment device, when activated, enables the segments to deploy radially outwardly into a pattern controlled at least in part by the at least one tether using aerodynamic and inertial forces only.

Projectile

A method for extracting material and mechanical properties of a cylinder subject to expansion cause by an explosion so as to better understand the evolution of damage. The method is directed towards obtaining material and mechanical properties of the cylinder between an undeformed state and a state of deformation prior to total fracture. The method includes the steps of providing: (1) a plurality of cylinders, each of which have the same physical dimensions; (2) a plurality of charges, each of the plurality of charges having a different diameter and hence explosive force; and (3) a fluid having a shock impedance less than a shock impedance of any of the plurality of charges. The method further includes the step of placing the charges in a respective cylinders, tilling the cylinder with the fluid and detonating the charge, and recording the cylinder radial velocity during radial expansion and post-mortem material properties.

Method for studying the evolution of damage in cylinders subjected to internal radial explosion

A shaped charge explosive device which includes an axially symmetric body of explosive material, a liner lining the forward end of the body, and a detonator disposed at the bottom of the body. The liner has an apex disposed along the symmetry axis of the body and the forward end of the body contains a gas filled cavity which overlaps the apex of the liner. When the detonator detonates the explosive material, a detonation wave is produced that collapses the liner into a plurality of liner parts which are projected against an external target. The gas filled cavity shapes the detonation wave so that the detonation wave impacts the liner at the most favorable angle to transfer energy to the liner and maximize the effective penetration of the external target by the projected liner parts.

Shaped charge explosive device and method of making same

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Belcamp, MD, United States of America

Daniel R Scheffler