Ballistic impact response of a coarse-aggregate barrier
- Army Research Lab., Aberdeen Proving Ground, MD (United States)
The physical understanding of the damage inflicted to a protective barrier resulting from impact with a projectile is paramount to the intelligent design of advanced protective systems. The configuration of the protective barrier used for ballistic impact studies depends upon the overall protective device that the barrier is to represent. Although many barriers are homogeneous in configuration, a much broader class of barriers involves a non-uniform agglomeration of components. Such barriers can conceivably represent the means of protection for ammunition bunkers, nuclear reactors, armored military vehicles, or any asset for which protection against projectile impact is desired. Here, an experiment-oriented investigation aimed at gaining insight and understanding of the physical phenomena that occur when a projectile impacts a thin barrier consisting of a uniform, coarse aggregate was performed at the US Army Research Laboratory. The thin barrier target was an assembly of solid steel cylinders oriented in a 15-by-15 rod square-packed array. The projectile consisted of a solid aluminum cylinder with a diameter of approximately 2.5 aggregate diameters and a length of 1.25 aggregate element lengths. The impact velocity was 2 km/s. The data collected consisted of the crater size in the barrier, plastic deformation of individual cylinders, a lateral damage wave velocity from the strain gage signals, and the residual penetrator length. A detailed analysis of the damage inflicted on the aggregate elements of the barrier was performed. The analysis focused primarily on the steel cylinders that resided outside of the eroded crater zone. Iso-strain contours were mapped on the face of the barrier to shed insight into the contact mechanics of the individual aggregate elements. A semi-empirical aggregate deformation model was created to predict the magnitude of deformation that occurs to cylinders located outside the physical crater.
- OSTI ID:
- 428118
- Report Number(s):
- CONF-960706-; ISBN 0-7918-1772-5; TRN: IM9708%%447
- Resource Relation:
- Conference: American Society of Mechanical Engineers (ASME) pressure vessels and piping conference, Montreal (Canada), 21-26 Jul 1996; Other Information: PBD: 1996; Related Information: Is Part Of Structures under extreme loading conditions -- 1996. PVP-Volume 325; Shin, Y.S. [ed.] [Naval Postgraduate School, Monterey, CA (United States)]; Zukas, J.A. [ed.] [Computational Mechanics Consultants, Inc., Baltimore, MD (United States)]; PB: 272 p.
- Country of Publication:
- United States
- Language:
- English
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