| Measurement of Stress in Ceramic Laminates With Micro-Raman |
30 JUN 2003 |
8 pages |
| Authors:
Nina Orlovskaya; DREXEL UNIV PHILADELPHIA PA DEPT OF MATERIALS ENGINEERING
|
 | Residual stresses in laminate ceramic composites were measured by micro-Raman spectroscopy. The research proceeded from laminate samples preparation, which included the mixture of powders in certain proportions, grinding them up to submicron dispersity, rolling of the tapes, placing the tapes in a certain order, and hot pressing. Several different ceramic laminates, such as Ti3SiC2-ZrO2, B4C-SiC, and Si3N4-TiN, were used for the determination of residual stresses by micro-Raman. The AlMgB-TiB2 superhard ... |
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| An Examination of Intercontinental Ballistic Missile Development Within the United States From 1952 to 1965 |
06 JUN 2003 |
96 pages |
| Authors:
Jeffrey A. Bair; ARMY COMMAND AND GENERAL STAFF COLL FORT LEAVENWORTH KS
|
| Intercontinental ballistic missiles (ICBM) development by the United States from 1952 through 1965 is marked by extreme urgency. The initial impetus for the development did not proceed within military channels; this paper explores possible reasons why the military channels were not the originator of the program. These reasons include the competition for mission and resources an ICBM capability represented to manned strategic bombers. Significant technological breakthroughs and strong leadership from ... |
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| Operator's Manual for the Ballistic Data Acquisition System (BDAS) |
JUN 2003 |
26 pages |
| Authors:
Brian G. Smith; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The U.S. Army Research Laboratory (ARL) purchased hardware and software from National Instruments, Inc., to improve its existing data collection system in support of ballistic testing of military systems. The hardware and software have been configured with a personal computer to create a stand-alone, computer-controlled, data acquisition system with real-time data display. The data acquisition system is called "BDAS," an acronym for ballistic data acquisition system. The first priority was ... |
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| Fatigue and Hydrogen Cracking in Cannons With Mechanical and Thermal Residual Stresses |
APR 2003 |
16 pages |
| Authors:
J. H. Underwood; A. P. Parker; E. Troiano; G. N. Vigilante; M. D. Witherell; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS
|
| Bauschinger-modified autofrettage residual stresses are used to improve the fatigue intensity factor model for fatigue life of cannon pressure vessels. Effects of yield strength and initial crack size are included with applied and residual stress. In an S-N description of cannon tube life that matches full-scale cannon fatigue test results with an R2 correlation of O.92. Thermally induced residual stress near the bore of a fired cannon is modeled by ... |
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| Vented Fixture Modeling |
APR 2003 |
24 pages |
| Authors:
Paul Conroy; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Vented fixtures have been used extensively for erosion/erosivity investigation for many years. The fixtures can assist in quickly assessing materials/propellants and interactions as well as understanding mechanisms of erosion. In this report, two fixtures are modeled a 37-mm fixture at the U.S. Army Research Laboratory and a 2OO-mm bomb with a l-mm vent hole, located in Canada. Both fixtures erode a nozzle-type insert. The 37-mm fixture is designed to maintain ... |
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| Influence of Air Gaps on Long Rod Penetrators Attacking Multi-Plate Target Arrays |
FEB 2003 |
24 pages |
| Authors:
Allister Copland; Daniel Scheffler; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Quarter-scale shots of an L/D 20 65-g U-3/4 Ti long rod penetrator were fired into a series of rolled homogeneous armor targets at normal incidence at nominally 1600 m/s. The purpose was to determine the effect of small air gaps in a laminated stack of plates. Three replications of shots were fired at a monolithic target, a laminated target with plate faces in intimate contact, and at laminated targets separated ... |
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| Modeling of Rocket Motor Ballistics for Functionally Graded Propellants |
2003 |
13 pages |
| Authors:
Gregory Young; Hugh A. Bruck; Swaminathan Gowrisankaran; MARYLAND UNIV COLLEGE PARK DEPT OF MECHANICAL ENGINEERING
|
| Functionally Graded Solid Rocket Propellants are being developed at NSWC-lndian Head in conjunction with the University of Maryland. The approach being used treats these propellants as typical Functionally Graded Materials (FGMs), which by definition are structures that possess gradual variations in material behavior that enhance material andlor structural performance. For functionally graded propellants, Twin Screw Extrusion (TSE) processing is used to continuously vary the composition throughout a grain in a ... |
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| Optimizing Functionally Graded Materials to Resist Failure under Dynamic Loadings |
25 NOV 2002 |
13 pages |
| Authors:
Toshio Nakamura; STATE UNIV OF NEW YORK RESEARCH FOUNDATION AT STONY BROOK OFFICE OF SPONSOREDPROGRAMS
|
| After three years of the project, many of the proposed research topics have been completed and manuscripts were submitted for publication. First, for the dynamic crack propagation within functionally graded materials (FGMs), a novel fracture criterion was introduced. It is based on energy concept and controls crack growth rate and associated plastic dissipation flow. This model was implemented in dynamic failure analysis to investigate crack propagation within elastic plastic graded ... |
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| Penetration of a Highly Oblique Steel Plate by a Thin Disk |
SEP 2002 |
28 pages |
| Authors:
Nathaniel Bruchey; Kent Kimsey; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| Segmented rod penetrator concepts created interest in the ballistic performance of high-density, low length-to-diameter (LID) ratio penetrators, but there was a lack of data showing the performance of such thin disks vs. high- obliquity targets. An experimental and computational study was conducted to examine the basic case of a single tungsten heavy alloy disk with an LID of 1/8 impacting a high-obliquity (65 degrees) rolled homogeneous armor steel plate at ... |
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| Safe Maximum Pressure Determination for the M829E3/M256 Cannon Qualification Program |
SEP 2002 |
20 pages |
| Authors:
David C. Smith; Eugene E. Coppola; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS
|
| The M256 120-mm cannon is the main armament of the M1A1 and M1A2 tanks. With the increased pressure generated by the latest version of the M829 APFSDS-T cartridge (A3), the yield strength of the cannon would have been insufficient to prevent elastic deformation of the tube. Classic theory indicated that this pressure could not have been contained, but it was known that the theory is somewhat conservative. By testing to ... |
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| Performance Tradeoff Study of a GPS-Aided INS for a Rocket Trajectory |
MAR 2002 |
|
| Authors:
Muhittin Istanbulluoglu; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
 | The Turkish Air Force (TuAF) has started a project to launch a satellite using only Turkish resources. Primary motivation behind this research is to assist TuAF's project by keeping up with these innovations in the navigational arena. The basic challenge in navigation system design is to decide which navigation system (or systems) and implementation techniques will be used, depending on accuracy requirements. The two primary navigation systems that will be ... |
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| Recent Representative IAT Studies in Hypervelocity Penetration Mechanics With Bibliographies |
FEB 2002 |
27 pages |
| Authors:
W. G. Reinecke; TEXAS UNIV AT AUSTIN INST FOR ADVANCED TECHNOLOGY
|
| The Institute for Advanced Technology (IAT) has conducted, and continues to conduct, a broad program to investigate the penetration characteristics and lethality of rod penetrators. The IAT's investigations are experimental, analytical, and numerical and are concerned primarily with slender rods impacting armor steel and ceramic targets at hypervelocity that is, above about two km/s. This report summarizes the results developed in representative examples of these studies that supported the U.S./IiK ... |
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| A Study of a Steel Right Circular Cylinder (RCC) Striking 23 Plies of KM2 Fabric Using the LS-DYNA Lagrangian Hydrocode |
FEB 2002 |
56 pages |
| Authors:
Dennis S. Pritchard; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| A study was conducted to examine the terminal effects of a 1.0-g steel RCC impacting 23 plies of KM2 fabric using the LS-DYNA Lagrangian hydrocode. The simulated impact velocities were 200, 400, 600, 800, 1000, 1200, and 1400 m/s. The fabric was a plain weave of 850 denier yarn. The LS-DYNA- simulated V(sub s) versus V(sub r) data points generated at the U.S. Army Research Laboratory (ARL) were compared to ... |
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| Comparisons of Ballistic Trajectory Simulations Using Artillery Meteorological Messages Derived from Local Balloon Data and Battlescale Forecast Model Data for the 1998 SADARM IOT&E Firings |
NOV 2001 |
41 pages |
| Authors:
Terry C. Jameson; Saba A. Luces; Dave Knapp; ARMY RESEARCH LAB WHITE SANDS NM COMPUTATIONAL AND INFORMATION SCIENCE DIRECTORATE
|
| This report describes meteorological (Met) analyses of data collected during the Sense and Destroy Armor (SADARM) Initial Operational Test & Evaluation (IOT&E) firings that occurred during the summer of 1998 at Fort Greeley, Alaska. Due to the complex terrain and local wind conditions encountered in the test area during the IOT&E, the Met study was proposed as a way to evaluate current and future artillery Met forecasting capabilities to improve ... |
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| Acquisition of the Firefinder (AN/TPQ-47) Radar |
31 OCT 2001 |
58 pages |
| Authors:
INSPECTOR GENERAL DEPT OF DEFENSE ARLINGTON VA
|
| The Firefinder (AN/TPQ-47) Radar (the Q-47), an Army Acquisition Category III program, is intended to improve upon and replace the Firefinder (AN/TPQ-37) Radar (Q-37). The Q-47 will identify incoming projectiles, consisting of mortars, artillery, rockets, and short-range missiles and will determine the launch and impact location of the projectile. The Q-47 will provide greater mobility and range with 50 percent greater target location accuracy than the Q-37. The Army plans ... |
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| Insensitive High Energy Propellants for Advanced Gun Concepts |
OCT 2001 |
47 pages |
| Authors:
Albert W. Horst; Patrick J. Baker; Betsy M. Rice; Pamela J. Kaste; Joseph W. Colburn; Jennifer J. Hare; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| In recent years, substantial improvements in the performance of solid propellant guns have resulted from the development of higher energy propellants, higher loading density propellant charge configurations, and propellant geometries and concepts that have provided the progressively increasing gas generation rates required to efficiently use available increases in total energy. Unfortunately, these same features also typically lead to increases in ammunition vulnerability to enemy threats. Coupled with the current interest ... |
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| Aeroballistic Range Tests of Missile Configurations with Non-Circular Cross Sections |
SEP 2001 |
87 pages |
| Authors:
Wayne H. Hathaway; Benjamin Kruggel; Gregg Abate; Gerald Winchenbach; John Krieger; ARROW TECH ASSOCIATES SOUTH BURLINGTON VT
|
| Non-axisymmetric body shapes are currently being considered by weapon designers. These applications and requirements include increased range, increased maneuverability, and conformal stores to reduce aircraft drag or radar signature. The objective of this test program is to obtain experimental aerodynamics on several basic cross sectional shape variations, The resulting database will serve to supplement the existing database of experimentally determined aerodynamics and will be used to improve current analytical methodologies ... |
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| Comprehensive Visualization of Interface Defeat-Based Ballistic Impact Damage in a Titanium Carbide (TiC) Ceramic Target Disk |
SEP 2001 |
134 pages |
| Authors:
William H. Green; Joseph M. Wells; Nevin L. Rupert; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| This study was initiated to demonstrate the feasibility of applying the state-of-the-art nondestructive testing methodology known as x-ray computed tomography (CT) to a ballistic damage assessment. Specifically desired is the capture, digitization, and display, in both two-dimensional (2-D) and three- dimensional (3-D) formats, of the actual mesocracking damage created in bulk ceramic targets following an interface defeat or dwell ballistic impact experiment. Dwell involves the delay, and interface defeat involves ... |
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| Measurement of V50 Behavior of a Nylon 6-Based Polymer-Layered Silicate Nanocomposite |
SEP 2001 |
36 pages |
| Authors:
David Ostermayer; Frederick L. Beyer; Peter G. Dehmer; Melissa A. Klusewitz; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| The performance under ballistic impact conditions of a nylon 6-based polymer-layered silicate (PLS) nanocomposite was examined using a V50 test. The commercially available nanocomposites contained approximately 2.5-wt.% montmorillonite clay mineral and were fabricated by in situ polymerization of epsilon-caprolactam in the presence of an organosilicate clay mineral. The velocity at which 50% of 0.22-cal. fragment simulator projectiles penetrated the unmodified nylon 6 and 0.5-mm aluminum witness plate (V50) was determined ... |
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| Feasibility of Low Cost Fabrication of Lightweight, Protective Structures using Thermoplastic Matrix Composites |
SEP 2001 |
22 pages |
| Authors:
C. D. Rudd; A. M. Manwaring; R. Brooks; NOTTINGHAM UNIV (UNITED KINGDOM) SCHOOL OF MECHANICAL MATERIALS MANUFACTURING ENGINEERING AND MANAGEME
|
| An investigation has been carried out into the low cost fabrication of lightweight thermoplastic composites for ballistic protection. Panels have been manufactured over a range of conditions using lightweight ballistic reinforcement, interleaved with polymer films. The ease of production is promising, and even at relatively low molding pressures and times the panels are well consolidated. Quasi-static penetrative tests were carried out using a Fragment Simulating Projectile (FSP) and have established ... |
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| Development of an Urban Warfare Virtual Environment |
31 AUG 2001 |
90 pages |
| Authors:
R. D. Eisler; G. Tyra; A. K. Chatterjee; G. H. Burghart; MISSION RESEARCH CORP LAGUNA HILLS CA
|
| This effort provides a 3D real-time simulated urban warfare combat environment that allows training and analysis of the actions that take place in that environment without the expense and hazards associated with a live fire exercise. In traditional VR simulations the occurrence of weapon effects does not actually modify the three-dimensional database from which the simulated environment is generated. As a result, dynamic changes to the environment from weapon effects ... |
|
| Engine Debris Fuselage Pentration Testing, Phase 1 |
AUG 2001 |
31 pages |
| Authors:
Steven J. Lundin; NAVAL AIR WARFARE CENTER WEAPONS DIV CHINA LAKE CA
|
| During February 1999, the Naval Air Warfare Center Weapons Division (NAWCWD), China Lake, conducted a series of simulated uncontained engine failure structural impact tests. A large gas gun was used to launch turbine engine fan blade segments into an aircraft fuselage The impacts were documented and analyzed with high-speed photography. Impact velocities, presented areas, and residual velocities were calculated. The data were then compared to analytic results predicted by the ... |
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| Improving the Rod-Penetration Algorithm for Tomorrow's Armors |
JUN 2001 |
27 pages |
| Authors:
Steven B. Segletes; Rick Grote; John Polesne; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The performance of the respected Frank-Zook penetration algorithm (Zook, J. A., Frank, K., and Silsby, G. F., Terminal Ballistics Test and Analysis Guidelines for the Penetration Mechanics Branch', BRL-MR-3960, January 1992) is examined in light of an anticipated class of target technologies involving laminated targets whose layers are thin relative to the projectile diameter. This class of target designs encompasses multifunctional integral armors and, in the limiting case, armors incorporating ... |
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| Scalable Simulations of Penetration Mechanics on the SGI Origin 3800 and the IBM SP Power3 Computer Systems |
JUN 2001 |
31 pages |
| Authors:
Stephen J. Schrami; Kent D. Kimsey; Thomas M. Kendall; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| This report presents an overview of an explicit message-passing paradigm for an Eulerian finite volume method for modeling solid dynamics problems involving shock wave propagation, multiple materials, and large deformations. Three-dimensional simulations of high velocity impact were conducted on the SGI Origin 3800 and the IBM SP Power3 computer systems. The scalability of the message-passing code on these architectures is presented and compared to the ideal linear multiple processor performance. ... |
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| Penetration of Multiple, Axially Offset, Disk-Shaped Penetrators |
JUN 2001 |
31 pages |
| Authors:
Kent Kimsey; Stephen J. Schraml; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The terminal ballistic performance of high-velocity, low length-to- diameter (L/D) ratio projectiles impacting steel targets has been a topic of considerable interest in penetration mechanics to evaluate the efficacy of segmented projectiles. A computational study has been conducted to examine the penetration performance of multiple (i.e., three), axially offset, disk-shaped projectiles impacting semi-infinite rolled homogeneous armor (RHA). A constant 3.25 projectile diameter separation distance between each disk-shaped projectile was maintained ... |
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| Three-Dimensional Modelling and Simulation of Ballistic Impact |
01 MAY 2001 |
6 pages |
| Authors:
Michael Ortiz; CALIFORNIA INST OF TECH PASADENA GRADUATE AERONAUTICAL LABS
|
| The overarching theme of the work originally proposed concerned the development of three-dimensional computational capability enabling the lagrangian simulation of armor penetration. The principal objectives of the work, as stated in the proposal, were: (1) The development of three-dimensional computational capability including adaptive meshing, direct simulation of fracture and fragmentation by cohesive elements, nonsmooth contact and friction. (2) Verification and validation of the unit algorithms. (3) The demonstration of the ... |
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| Explicit Finite Element Methodologies for Simulating the Mega-Hertz Plate and the Ballistic Shock Simulator |
MAY 2001 |
43 pages |
| Authors:
Photios P. Papados; Raju R. Namburu; Krishan Bishnoi; Douglas Templton; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Modem armored vehicles are equipped with a variety of sensitive components on board, such as computers, telecommunication equipment, range finders, and infrared devices. One potential failure to these sensitive electronic components is due to the high frequency shock wave transmitted through the structure due to impact loads. Failure or malfunction of the electronic equipment can severely damage the combat capability of the armored vehicle, even though the crew survives and ... |
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| Spin Rate Sensor for Fuzing Applications, Theory and Test Results |
18 APR 2001 |
19 pages |
| Authors:
Dale Spencer; Tim Tiernan; Pete Solari; Fred Piering; KAMAN CORP BLOOMFIELD CT
|
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| Development, Theory & Some Test Results |
12 APR 2001 |
28 pages |
| Authors:
Thomas K. Harkins; COASTAL SYSTEMS STATION PANAMA CITY FL
|
| This presentation of viewgraphs describes hydroballistics, its development, theory and some test results. Hydroballistics is the study or design of objects that have momentum underwater; they are fully wetted, cavitating and supercavitating. Key parameters are drag, stability and control and structural integrity. |
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| Expanding the Traditional Effectiveness Window |
09 APR 2001 |
25 pages |
| Authors:
Jan Hasslid; NORDIC AMMUNITION CO RAUFOSS (NORWAY)
|
| This report on Expanding the Traditional Effectiveness Window is a slide presentation consisting of 25 presentation slides from the Proceedings of the 36th Annual Gun & Ammunition Symposium & Exhibition held on 9- 12 April 201. The symposium was sponsored by NDIA. |
|
| Rarefaction Wave Gun Propulsion |
APR 2001 |
23 pages |
| Authors:
E. Kathe; R. Dillon; S. Sopok; M. Witherell; S. Dunn; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS
|
| RArefaction waVE guN (RAVEN) propulsion constitutes a novel means to dramatically reduce the recoil momentum and heat imparted to future cannons during firing. The method may be considered a hybrid propulsion technology with features common to both closed-breech cannons and recoilless rifles. Reduction of recoil and gun heating would greatly facilitate large caliber gun integration within light future combat system (FCS) vehicles. Analysis of a RAVEN launcher comparable to the ... |
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| Effect of Body Cross Section on Projectile Aerodynamic Performance With Application to Electromagnetic (EM) Guns |
APR 2001 |
36 pages |
| Authors:
Paul Weinacht; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The most effective bore cross-section geometry for electromagnetic (EM) guns may differ significantly from the circular cross section of conventional guns. The geometry of the bore cross section will influence the shape of the armature/subprojectile launch package. For certain applications, a noncircular cross section may provide payload packaging benefits which have not been considered previously for conventional circular cross-section guns. Whether these benefits can be fully realized depends, in part, ... |
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| Interior Ballistics Modeling: Extensions to the One-Dimensional XKTC code and Analytical Studies of Pressure Gradient for Lumped Parameter Codes |
FEB 2001 |
184 pages |
| Authors:
Paul S. Gough; GOUGH (PAUL) ASSOCIATES INC PORTSMOUTH NH
|
| We describe a number of extensions to the XNOVAKTC (XKTC) Code, a model of interior ballistic phenomena based on a numerical solution of the governing equations for one-dimensional, multi-phase flow. We also present some analytical formulations for the pressure gradient in a gun in a form suitable for incorporation into a lumped parameter interior ballistics model. In XKTC, the flow resistance formula for stacked granular propellant is extended to account ... |
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| Basic Science of Preparation: Transmission Electron Microscopy and Modeling of Copper and Aluminum Targets |
JAN 2001 |
239 pages |
| Authors:
L. E. Murr; Christine Kennedy; TEXAS UNIV AT EL PASO DEPT OF METALLURGICAL AND MATERIALS ENGINEERING
|
| This research involves an effort to study and compare the residual microstructures and dynamic behavior of two metallic targets of finite thicknesses, namely OFHC (oxygen-free high-conductivity) copper and 7039 aluminum, subjected to ballistic impact and perforation by a tungsten heavy alloy (WHA) projectile. Also included in this work is an attempt to validate mathematical modelling of experimental results through the use of a computer hydrocode, AUTODYN-2D, which allows for the ... |
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| Comparison of Autofrettage Calculation Methods |
JAN 2001 |
15 pages |
| Authors:
G. P. O'Hara; Edward Troiano; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET WEAPONS LAB
|
| The use of residual bore compression to strengthen cannon barrels can be traced back to an 1856 test conducted by Captain Thomas Jefferson Rodman using ten-inch columbiads (ref 1). His residual stress was produced by a hollow casting method, and it is clear that Rodman did not understand the true reason for the nine-factor improvement in fatigue life over a solid cast gun. This problem had been corrected by l880, ... |
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| Simulations Varying Projectile Sabot Front-Bell Stiffness and its Effect on Dispersion |
JAN 2001 |
34 pages |
| Authors:
Thomas F. Erline; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| This report extends the results of XM881 dispersion modeling done previously by changing the front-bell spring stiffness. The models studied show the effect on dispersion of the XM88 1 when changing the sabot front-bell stiffness by a power of 10 softer and stiffer. These two modified cases are compared to the nominal case. The basis for this work comes from modeling and experimenting. All mathematical modeling results come from the ... |
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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
|
| 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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| An Adaptation of Walker-Anderson Model Elements into the Frank-Zook Penetration Model for Use in MUVES |
SEP 2000 |
58 pages |
| Authors:
Steven B. Segletes; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The performance of the well-respected Frank-Zook (FZ) penetration algorithm is examined in light of an anticipated class of target technology involving laminated targets whose layers are thin relative to the projectile diameter (in the limiting case, this target class incorporates functionally graded materials). Because of the manner in which the FZ algorithm anticipates changes in material properties along the shotline of the penetrator, the algorithm is susceptible to inaccuracy precisely ... |
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| A Computational Study of Munitions Response to Double Impact and Crushing Impact From a Flyer Plate |
AUG 2000 |
137 pages |
| Authors:
Patsy B. Simmers; Richard E. Lottero; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| This report describes the results of a series of hydrocode computations, each of which modeled a steel flyer plate striking a single munition, either an M2A3 or an M483, in one of two different mounting configurations. One mounting configuration was for the munition to be first struck by the flyer plate and then to subsequently translate and strike a backing plate. The second ... |
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| The Effective Velocity of Escape of the Powder Gas from A Gun |
28 JUL 2000 |
25 pages |
| Authors:
J. Vinti; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The effective velocity of escape of the powder gas from a gun, as defined by Eq. (1), is a quantity that is independent of the mass of the recoiling parts. It is the purpose of this report to develop a method for predicting the escape velocity that will be satisfactory for values of the ratio of the mass of the charge to that of the projectile as large as unity. ... |
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| Shape Factor of a Randomly Oriented Cylinder |
JUL 2000 |
46 pages |
| Authors:
Richard Saucier; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| This report defines a dimensionless shape factor which is useful for characterizing the penetration potential of projectiles and irregular shaped fragments. The shape factor, so defined is purely a function of shape and orientation and is independent of mass and material density. The shape factor of some simple shapes is calculated exactly, but the focus of this report is on a right circular cylinder (RCC). Not ... |
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| Modeling and Simulation of a Differential Roll Projectile |
JUL 2000 |
50 pages |
| Authors:
Mark F. Costello; OREGON STATE UNIV CORVALLIS
|
| This report develops the equations of motion for a differential roll projectile configuration with seven degrees of freedom. The dynamic equations are generated generically such that the forward and aft components are mass unbalanced. A hydrodynamic bearing exists between the forward and aft components, which couples the roll degree of freedom. A simulation investigation shows that bearing resistance and forward/aft body mass ratio are the ... |
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| A Methodology for Characterizing Barrel Flexure Due to Tank Motion |
JUN 2000 |
39 pages |
| Authors:
Mark Bundy; James Newill; Vince Marcopoli; Michael Ng; Charles Wells; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Barrel centerline curvature is known to influence the location of projectile shot impacts. Superimposed on the unique manufactured barrel centerline is the flexed barrel shape that can occur prior to firing while the tank is on the move. In order to understand and quantify the effects of barrel flexure on gun accuracy, it is necessary to determine what combination of fundamental mode shapes is most ... |
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| HSTSS Battery Development for Missile and Ballistic Telemetry Applications |
MAY 2000 |
37 pages |
| Authors:
Lawrence W. Burke; Edward Bukowski; Colin Newnham; Neil Scholey; William Hoge; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The rapid growth in portable and wireless communication products has brought valuable advancements in battery technology. No longer is a battery restricted to a metal container in cylindrical or prismatic format. Today's batteries (both primary and secondary) can be constructed in thin sheets and sealed in foil/plastic laminate packages. Along with improvements in energy density, temperature performance, and environmentally friendly materials, these batteries offer ... |
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| European Forum on Ballistics of Projectiles (EFPB 2000) |
14 APR 2000 |
621 pages |
| Authors:
M. Giraud; V. Fleck; INSTITUT FRANCO-ALLEMAND DE RECHERCHES SAINT-LOUIS (FRANCE)
|
| This is an interdisciplinary conference. Topics include: Defense Research Organization; Projectiles; Internal Ballistics/Propulsion; Launch Dynamics; Aeroballistics; Flight Dynamics; Terminal Ballistic Effects and Vulnerability; Sensors and Metrology; and Perspectives towards the 21st Century. |
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| Impact Effects in Multilayered Plates |
APR 2000 |
33 pages |
| Authors:
Jonas A. Zukas; Daniel R. Scheffler; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| This report presents results of numerical simulations of impact effects in monoblock and multilayered plates using both Lagrangian and Bulerian wave propagation codes. It is found that lagrangian simulations compare favorably with experimental and analytical results. Eulerian codes, while ideal for large distortion situations such as penetration, have great difficulty in describing multiplate perforation due primarily to problems with the interface treatment in Eulerian ... |
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| Flight Mechanics of an Elastic Symmetric Missile |
APR 2000 |
76 pages |
| Authors:
Charles H. Murphy; William H. Mermagen Sr; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The free-flight motion of an elastic missile is approximated with three bodies connected by two massless elastic cantilever beams. If the mass distribution of the three bodies is 1-2-1, the frequency of the symmetric oscillation of the outer bodies is within 5% of the classical frequency of the oscillation of a free-free beam. A second combined pitching antisymmetric flexing motion can occur with a frequency that is almost twice that ... |
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| Automated Ballistic Constant Determination |
27 MAR 2000 |
26 pages |
| Authors:
Anthony F. Bessacini; Robert F. Pinkos; Eugene Bessacini; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A method for the automated generation of ballistic constants for use in a trajectory control system. The potential trajectory of a pursuing vehicle is divided into a plurality of multiple sequential phases wherein each phase is characterized by a plurality of ballistic parameters. Known simulated data from a number of runs concerning the pursuing vehicle is analyzed. Ballistic parameter values for each run are obtained and statistically analyzed to produce ... |
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| A Numerical Analysis of the Back Plane Transient Defromation of a Polycarbonate Plate |
FEB 2000 |
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| Authors:
Dennis Nandlall; Manon Bolduc; Gilles Pageau; DEFENCE RESEARCH ESTABLISHMENT VALCARTIER (QUEBEC)
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| This report presents experimental and numerical studies of the back plane transient deformation of a 3O4.8-mm square 4.76-mm thick, clamped polycarbonate plate Impacted by a specially designed polycarbonate fragment simulating projectile. This was done to simulate the back plane transient deformation of a composite helmet. The maximum transient deformation of the back plane of the plate Is presented as a function of the striking velocity. ... |
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| Scalability of the CTH Hydrodynamics Code on the Sun HPC 10000 Architecture |
FEB 2000 |
27 pages |
| Authors:
Stephen J. Schraml; Kent D. Kimsey; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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| This report presents an overview of an explicit message-passing paradigm for an Eulerian finite volume method for modeling solid dynamics problems involving shock wave propagation, multiple materials, and large deformations. Three-dimensional simulations of high velocity impact were conducted on the Sun HPC 10000 computer system. The scalability of the message- passing code on this symmetrical multiple processor architecture is presented and is compared to ... |
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Ballistics
