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Title: Development of a high-velocity powder gun and analysis of fragment penetration tests into sand
Authors: Butler, Dwain K.
Keywords: Fragmentation
Penetration tests
Powder guns
Publisher: Soils and Pavements Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Description: Miscellaneous Paper
Abstract: A high-velocity powder gun has been developed and is operational in the U.S. Army Engineer Waterways Experiment Station's Fragment Simulation Facility. The gun has many potential applications for study of the effectiveness of various components of fortification systems (such as soil, wood, fabric, concrete, steel, plastic, etc.) in defeating small-arms munitions and fragment-simulating projectiles. This report documents the design of the gun and presents the results of calibration tests (with nominal 3-g fragments) over the velocity range 0.05 to 0.222 cm/μsec. The results of 27 penetration tests of cylindrical fragments into dense sand targets are presented. Results are presented in the form of depth of penetration, fragment frontal enlargement, and fragment mass loss versus impact velocity plots. Comminution of the target material is also studied by performing posttest grain-size analyses for each test. The penetration depth achieved by high-velocity fragments in dense sand is observed not to be a monotonically increasing function of impact velocity but tends to remain constant after a critical impact velocity is exceeded; and the critical impact velocity appears to increase as the strength of the fragment material increases. The phenomenology of the impact-penetration process is discussed in detail. Correlations are established between the grain-size analyses, mass loss data, and frontal enlargement data, and the manner in which these complex phenomena interact is discussed in relation to the penetration depth-impact velocity curve. Finally, it is demonstrated that upper and lower bounds to the penetration depth-impact velocity data can be established in a rational manner with the WES analytical penetration model.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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