Ordered and highly scalable granular media for shock mitigation / by Robert Doney and Surajit Sen.

Format:

Book

Government document

Author/Creator:

Doney, Robert.

Contributor:

Sen, Surajit

U.S. Army Research Laboratory

Series:

ARL-TR (Aberdeen Proving Ground, Md.) ; 3612.

ARL-TR ; 3612

Language:

English

Subjects (All):

Shock.

Ballistics.

ballistics.

Physical Description:

1 online resource (vi, 60 pages) : illustrations.

Place of Publication:

Aberdeen Proving Ground, MD : Army Research Laboratory, [2005]

Summary:

We provide an update to our current efforts in studying shock mitigation using one-dimensional arrays of adjacent metal spheres that may progressively shrink in size. These tapered chains are characterized by the number of spheres, N, the amount of tapering, q, and restitutive losses, . Spheres are assumed to interact via the nonlinear Hertz potential, V 5/2, where is the amount of overlap of adjacent grains and the constant of proportionality varies with the material. To gauge the ability of such chains to absorb transient pulses, we look at the normalized kinetic energy, KEN, as a function of N, q, . A hard-sphere approximation and numerical analysis is therefore performed for 3 d N d 20 and 0 d q, d 0.1 for two tapered chain architectures. Intended experimental studies are outlined as those that have already been performed and focus on solitary wave propagation in monodisperse (q = 0) chains. Results are quite encouraging and independent of system size; consequently, we propose a tapered chain armor panel design consisting of many tapered chains working in tandem. The specific and gravimmetric absorbed energies are calculated for an example prototype. Intended work and further discussion are provided in the conclusion.

Notes:

Title from PDF title screen (Army, viewed July 22, 2010).

"September 2005."

Includes bibliographical references.

Prepared in cooperation with State Univ. of New York, Buffalo, NY.

OCLC:

74282648

Access Restriction:

APPROVED FOR PUBLIC RELEASE NOT AVAILABLE IN MICROFICHE.