| Coupling of CFD and CSM Codes for the Study of Projectile Response to Ballistics Environment |
DEC 2004 |
3 pages |
| Authors:
Stephen E. Ray; James F. Newill; Michael J. Nusca; Albert W. Horst; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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 | The state-of-the-art interior ballistics (IB) code for the Army, ARL- NGEN3, is being used to predict the interior ballistics behavior of next- generation gun charges, which include densely-packed solid propellants. Recently, the results from ARL-NGEN3 code simulations were linked to structural dynamics codes in order to predict the in-bore behavior of the projectile afterbody. In the current paper results are presented from recent efforts to bring together the capabilities of ... |
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| Multidimensional, Two-Phase Simulations of Notional Telescoped Ammunition Propelling Charge |
SEP 2004 |
24 pages |
| Authors:
Michael J. Nusca; Albert W. Horst; James F. Newill; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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| One of the many challenges facing weapon developers is the requirement for a highly lethal, lightweight, and compact large caliber gun system. One concept recently investigated by the U.S. Army is that of a swing- chamber gun, necessitating the use of telescoped ammunition. Such ammunition not only reduces the volume available for the propellant change, but also places severe geometric constraints on both the distribution of the propellant and the ... |
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| Predicting the Nonlinear Response and Failure of Composite Laminates: Correlation With Experimental Results |
JUN 2004 |
26 pages |
| Authors:
Travis A. Bogetti; Christopher P. R. Hoppel; Vasyl M. Harik; James F. Newill; Bruce P. Burns; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
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| A comprehensive comparison of laminate failure models was established to assess the state-of-the-art in laminate modeling technologies on an international level (known as Worldwide Failure Olympics Exercise) Compos. Sci. Technol. 58(1998) 1001, 1011, 1225. In our first contribution to this Exercise (Part A), we presented a complete theoretical description of an analysis methodology and documented predictions for the laminate response and failure behavior of various laminates under a broad range ... |
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| Validation of the U.S. Army Research Laboratory's Gun Dynamics Simulation Codes for Prototype Kinetic Energy |
SEP 2003 |
30 pages |
| Authors:
James F. Newill; Bernard J. Guidos; Carl D. Livecchia; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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| This report compares a priori gun-projectile dynamic simulations to experimental ballistic jump test data for seven 120-mm prototype kinetic energy (KE) projectiles and describes the methodology used for the comparison. The projectiles contain significant differences in their charge, subprojectile, and sabot designs that span the design parameters encountered in KE cartridge development. In such tests, four or more sets of orthogonal radiograph images (x-rays), which are typically used to characterize ... |
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| Launch Dynamics of the XM1002 Cartridge, 120-mm Target Practice Multipurpose Projectile, TPMP-T |
SEP 2003 |
20 pages |
| Authors:
James F. Newill; James Garner; Anthony Farina; Rollie Dohrn; Dipak Kamdar; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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| This report details the launch performance of the experimental XM1OO2. The study compares the accuracy performance of candidate XMlOO2 designs to aid the development. The results show significant differences in launch characteristic of the two types of projectiles, which are related to their transverse moment of inertia. |
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| Methodology for Determining Optimal Tank Cannon Barrel Centerline Shape |
SEP 2002 |
20 pages |
| Authors:
James F. Newill; James M. Garner; Mark L. Bundy; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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| This study describes the methodology for determining optimal gun tube centerline shape. It starts with describing system accuracy and then shows how different gun tube centerline shapes affect accuracy performance. The results show that the shape that imparts the smallest transverse disturbance has the best accuracy performance. |
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| A Multidisciplinary Approach to Aerodynamic Loading of a 2.75-in Rocket With Fins |
SEP 2001 |
30 pages |
| Authors:
Karen R. Heavey; James F. Newill; Jubaraj Sahu; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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| A multidisciplinary effort was undertaken to investigate the effect of structural loading on a rocket of interest to the U.S. Army. This report addresses the element of aerodynamic loading. Computational fluid dynamics techniques have been used to obtain numerical solutions for the flow field of a rocket with and without fins. Computed results have been obtained for a Mach number of 2.0 at 0 deg and 5 deg angles of ... |
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| Railgun Launcher Efficiency: Useful Measure or Misused Metric? |
MAY 2001 |
26 pages |
| Authors:
Alexander E. Zielinski; James F. Newill; Trevor Watt; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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| The efficiency of an electromagnetic railgun is assessed. In addition to electrical and kinematic loss terms, the portion of useful mass launched downrange is considered. Both integrated and fixed integrated launch package design approaches are considered using a system assessment code. Various current profiles are used to assess the performance of the launcher and integrated launch-package performance for a 3.52-kg launch package at a muzzle velocity of 2.5 km/s in ... |
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| Moisture Absorption of Coated Composite Materials |
MAR 2001 |
42 pages |
| Authors:
Melissa A. Klusewitz; Christopher P. Hoppel; Steven H. McKnight; James F. Newill; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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| Moisture diffusion measurements were made for coated and uncoated composite materials. Two substrates were used: T650/1914-4 (a graphite fiber reinforced thermoset epoxy) and AS4/UItem (a graphite fiber reinforced thermoplastic polymer). The specimens were tested uncoated and coated with three polymer coatings MIL-P-53030 Primer, Humiseal 2A53, and 2031 Siloxirane. The coatings generally absorbed more moisture than the specimens and increased the total moisture absorption for the coated parts. For the AS4/Ultem ... |
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| Aerodynamics of the 120-mm M831A1 Projectile: Analysis of Free Flight Experimental Data |
NOV 2000 |
49 pages |
| Authors:
Keith P. Soencksen; James F. Newill; Peter Plostins; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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| The 120-mm M831A1 projectile is a low-cost training projectile used by U.S. armor troops. For the last several years, program managers have received feedback from the users that in some cases, M831A1 impact performance did not appear consistent with the current M831A1 computer correction factor. Based on this information, a low-scale but in-depth experimental analysis of the projectile was conducted to assess its aero-ballistic qualities and ... |
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Reports by Author
