| Attempts to Create Ball Lightning with Triggered Lightning |
Oct-2009 |
33 pages |
| Authors:
Jonathan D Hill; Martin A Uman; Michael Stapleton; Douglas M Jordan; Alexander M Chebaro; Christopher J Biagi; FLORIDA UNIV GAINESVILLE DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
 | During the 2008 ball lightning experiment, around 100 different material samples were exposed to both relatively continuous (initial stage and inter-stroke continuing current) and to impulsive (return stroke) triggered lightning current. All events with properties similar to those reported by eye-witness and laboratory accounts of ball lightning were produced by slowly varying, relatively low amplitude currents during the initial stage of the triggered-lightning process. No events with sustained luminosity duration ... |
|
| Bactericidal Efficacy of Sanitizers Produced by Commercial Water Treatment Generators |
Apr-2009 |
23 pages |
| Authors:
CLAIRE LEE; Edmund M Powers; Joshua Magnone; Chad Haering; POWERS (EDMUND M) CO FRAMINGHAM MA
|
| Five commercial water sanitizer generators were tested, by the U.S. Army Natick Soldier Research, Development and Engineering Center (NSRDEC), for bactericidal efficacy of their sanitizer on stainless steel surfaces. Sanitizers generated were Acid Electrolyzed Water (AEW), hydrogen peroxide, mixed oxidants, and ozone. Manually produced chlorine dioxide was also tested. Surfaces were inoculated with three strain cocktails of S. aureus and E.coli, dried and then immersed in a solution of each ... |
|
| Galvanic Corrosion Study on SS Cartridge Design |
05-Feb-2009 |
24 pages |
| Authors:
Daniel P Schmidt; ARMY RESEARCH DEVELOPMENT AND ENGINEERING COMMAND ABERDEEN PROVING GROUND MD
|
| BACKGROUND: Lightweight Cartridge for Small Arms program at Picatinny -- Designing/developing stainless steel cartridge case -- For structural support inserting Al plug * Galvanic corrosion -- Dissimilar metals that are in electrical contact while immersed in a solution electrolyte * 3 main galvanic couples of concern. OBJECTIVE: To investigate the galvanic interaction between the materials used in the new ammunition design under aggressive conditions to determine if there will be ... |
|
| Evaluation of the Snap Sampler for Sampling Ground Water Monitoring Wells for Inorganic Analytes |
Dec-2008 |
74 pages |
| Authors:
Louise V Parker; Nathan D Mulherin; Gordon E Gooch; ENGINEER RESEARCH AND DEVELOPMENT CENTER HANOVER NH COLD REGIONS RESEARCH AND ENGINEERING LAB
|
| Abstract: Laboratory studies and a field demonstration were conducted to determine the ability of the Snap Sampler to recover representative concentrations of inorganic analytes, including metals, from ground water. For the laboratory studies, concentrations of analytes in Snap Sampler samples were compared with concentrations of the analytes in samples collected from a standpipe (i.e., control samples). These studies clearly demonstrated that Snap Sampler concentrations were comparable to control sample concentrations. ... |
|
| Laboratory-Scale Study in Determining the Decontamination Standards for Personnel Protective Equipment Used by Homeland Defense Personnel: Evaluation of Commercial Off-the-Shelf Technologies for Decontamination of Personnel Protective Equipment-Relevant S |
01-Jun-2008 |
19 pages |
| Authors:
Lalena Wallace; Vipin K Rastogi; Lisa S Smith; Saumil S Shah; Jonathan Sabol; EDGEWOOD CHEMICAL BIOLOGICAL CENTER ABERDEEN PROVING GROUND MD
|
| In 2001, dissemination of letters tainted with anthrax-causing spores through USPS led to a limited number of deaths and contamination of several hundred thousand cubic feet of surface space within government and commercial buildings. In the context of homeland security, these and other cases involving ricin toxin demonstrated the urgent need to develop countermeasures for cleaning up complex surfaces relevant to personnel protective equipment (PPE). Four relevant surface materials (polycarbonate, ... |
|
| Laser Dot Projection Photogrammetry and Force Balance Measurement Techniques for Flapping Wing Micro Air Vehicles |
Mar-2008 |
135 pages |
| Authors:
David H Curtis; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| The purpose of this research was to develop testing methods capable of analyzing the performance of a miniature flapping-wing mechanism that can later be adapted to a flapping wing micro air vehicle (MAV). A previously designed and built flapping only mechanism was used for testing, while a previously designed flapping and pitch mechanism was fabricated utilizing an Objet Eden 500V 3-dimensional printer and its operation demonstrated. The flapping mechanism was ... |
|
| The Influence of Marine Biofilms on Corrosion: A Concise Review |
Jan-2008 |
7 pages |
| Authors:
Richard I Ray; Brenda J Little; Jason S Lee; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
|
| The following is a concise review of the literature that addresses the impact of marine biofilms on two phenomena--ennoblement of corrosion potential and sulfide derivitization due to sulfate-reducing bacteria. A universally defined mechanism of potential ennoblement has not been established. Extent of ennoblement varies among locations and the extent of ennoblement for a particular material cannot be used to predict an increased likelihood of localized corrosion. There is some controversy ... |
|
| Remote Measurement of High Temperatures in the Presence of a Strong Magnetic Field |
07 MAY 2007 |
50 pages |
| Authors:
Scott F. Lord; NAVAL ACADEMY ANNAPOLIS MD
|
| The environment inside a railgun makes conventional temperature sensing techniques ineffective. Large time-varying magnetic fields induce noise into sensors with electrical connections. The high rate of change of temperature requires a fast thermal response and a fast sampling rate. Finally, the intense heat generated requires a sensor that is thermally stable over a large range of temperatures. To overcome such environmental challenges, this project utilized an interferometric technique where the ... |
|
| Progress Report on Activities in Support of Composite Repair Engineering Development Program Tasks AF, AH and AI |
NOV 2006 |
|
| Authors:
A. N. Rider; D. Parslow; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION VICTORIA (AUSTRALIA) AIR VEHICLES DIV
|
 | Research has been undertaken to support the Royal Australian Air Force's commitments to the F/A-18 Composite Repair Engineering Development Program (CREDP). This report details work that has examined the effectiveness of surface treatments for adhesive bonding to aluminium, titanium and stainless steel (Tasks AF and AH) and the benefit of resin injection repairs to damaged composite laminates to restore fatigue strength (Task Al). The studies showed that bonding to high ... |
|
| Corrosion of Cellular Metals in Marine Environments |
30 SEP 2006 |
35 pages |
| Authors:
John R. Scully; VIRGINIA UNIV CHARLOTTESVILLE DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| The specific objective of this research is to establish the foundation to enable the next generation of corrosion resistance cellular metals for high performance naval applications. The basis for this work is an interdisciplinary approach that aims to understand: (a) the electrochemical, chemical, and metallurgical conditions that corrode cellular metals in marine environments when fabricated by brazing processes, (b) the impact of braze fabrication time, temperature and diffusion length on ... |
|
| Hybrid Mole Computer Using Vapor Phase Assembly |
MAY 2006 |
73 pages |
| Authors:
L. R. Harriott; J. C. Bean; M. Stan; N. Swami; VIRGINIA UNIV CHARLOTTESVILLE
|
| The UHV vapor phase assembly of molecules was performed in a stainless steel chamber that is part of a molecular beam epitaxy (MBE) system (shown on the following page) that Professor John Bean brought to the University of Virginia from Bell Labs. This MBE system has two chambers: one that was used for silicon and germanium growth, and the second (referred to as Dep 2 from now on) we engineered ... |
|
| Overview of Low Plasticity Burnishing for Mitigation of Fatigue Damage Mechanisms |
SEP 2005 |
7 pages |
| Authors:
Paul S. Prevey; N. Jayaraman; John Cammett; LAMBDA RESEARCH CINCINNATI OH
|
| Surface enhancement technologies such as shot peening (SP), laser shock peening (LSP), and low plasticity burnishing (LPB) can provide substantial fatigue life improvement. However, to be effective, the compressive residual stresses that increase fatigue strength must be retained in service. LPB provides thermally stable compression and can be performed in conventional machine shop environments on CNC machine tools. LPB enables the extension of component service lives fatigue limited by various ... |
|
| Development of Heterostructure Materials for Thermoelectric Device Applications |
AUG 2005 |
17 pages |
| Authors:
Eugene A. Fitzgerald; Merton C. Flemings; Mayank Bulsara; MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| A seed program was performed to establish directions for materials research in lead salt quantum dot superlattices. The objective is to define a program that could increase the ZT of quantum dot superlattices in the lead salt system, as well as move in a direction compatible with future DOD commercial access. This final report for the seed contract also acts as the main input into a proposal for future work, ... |
|
| Investigation of Local Hydrogen Uptake in Rescaled Model Occluded Sites Using Crevice Scaling Laws |
APR 2005 |
46 pages |
| Authors:
John R. Scully; Michael Switzer; VIRGINIA UNIV CHARLOTTESVILLE DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| The effects of occluded site geometry and applied potential on hydrogen production and uptake in a martensitic stainless steel (Fe-l3Cr-8Ni-2Mo-1Al) were explored. On planar electrode surfaces, the total hydrogen concentration was found to increase exponentially with hydrogen overpotential. The x(exp 2)/gap scaling law, where x is the pit/crevice depth and "gap" is the pit/crevice width, was utilized to rescale model pits from micrometer to millimeter dimensions. Such rescaling enabled local ... |
|
| Evaluation of Corrosion Preventive Compounds for Aviation Materials Applications |
APR 2005 |
149 pages |
| Authors:
Brian E. Placzankis; Chris E. Miller; Scott M. Grendahl; Tracey L. Miller; Stephanie M. Piraino; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Corrosion preventive compounds (CPCs) were evaluated using substrates comprised of five commonly used rotary wing aviation materials. The materials used were magnesium alloy AZ31B-H24 aluminum alloy 2024-T3, 4130 low alloy steel. 4340 high strength steel, and AM-355 stainless steel. The relative performance of each CPC was assessed in combination with the materials under several different tests. These tests consisted of general corrosion resistance. resistance to crevice corrosion attack. stress corrosion ... |
|
| Investigation and Development of Oil-Injection Nozzles for High-Cycle Fatigue Rotor Spin Test |
MAR 2005 |
113 pages |
| Authors:
Oscar R. Moreno; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF MECHANICAL AND ASTRONAUTICAL ENGINEERING
|
| Resonant excitation tests of rotor blades in vacuum spin pits using discrete oil jets showed that impact erosion of the blades could limit test times, but lower excitation amplitudes were produced using mist nozzles. Smaller diameter discrete jets might extend test times, but to fully prevent erosion, oil mist droplet size needed to be 30 microns or less. The present study examined both approaches. Prototype nozzles were developed to create ... |
|
| Propulsion and Power Rapid Response To Research and Development Support. Delivery Order 0028: Lithium Carbon Monoflouride Cell Development |
MAR 2005 |
49 pages |
| Authors:
Timothy Counts; EAGLE-PICHER TECHNOLOGIES LLC JOPLIN MO
|
| This document reports the work performed and the results obtained in developing materials and processes that could lead to a relatively high rate primary Li/CFx D cell. |
|
| Optimization of Superaustenitic Stainless Steel Filler Metals for Welding Advanced Double Hull Combatant Ships |
16 FEB 2005 |
58 pages |
| Authors:
Timothy D. Anderson; Kenneth D. Adams; Matthew J. Perricone; John N. DuPont; Arnold R. Marder; LEHIGH UNIV BETHLEHEM PA DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| The performance of welds on superaustenitic stainless steels (SASS) such as AL-6XN has been improved through the use of a new microstructutal development sequence. Thermodynamic calculations were used to isolate the range of possible filler metal compositions, the results of which were confirmed experimentally through alloy construction and EPMA analysis. HED welds on the alloys were used to induce the massive transformation, which is capable of producing fully-austenitic welds with ... |
|
| Solid Acid Based Fuel Cells |
28 JAN 2005 |
18 pages |
| Authors:
Sossina M. Haile; CALIFORNIA INST OF TECH PASADENA
|
| High power density fuel cells based on solid acid electrolytes have been demonstrated. In particular, a fuel cell with a 25 micron thick CsH2PO4 membrane was fabricated and yielded a power density of 425 mW/cm2 at 26O C (H2/ O2) without pressurization. In this configuration, the thin-film fuel cell is supported on a porous stainless steel gas diffusion layer and the electrocatalyst and electrolyte layers are spray-deposited. In parallel with ... |
|
| An Evaluation of an Inline Sensor for Detection of Microbial Activity |
2005 |
|
| Authors:
Jason S. Lee; Richard I. Ray; Brenda J. Little; Daniel R. DeMarco; Michael H. Dorsey; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
|
| Laboratory experiments were designed to determine the influence of polarization (+175 mV vs. saturated calomel electrode) in natural fresh water and in dilute microbiological media (1:100 Luria-Bertani broth) on biofllm formation on 316L stainless steel. Biofllms formed on all polarized and unpolarization surfaces within 120 hours. Variability among the surfaces was detected with environmental scanning electron microscopy. Polarization influenced microbial formed in the absence of polarization. |
|
| Novel Approach for Welding Stainless Steel Using Cr-Free Welding Consumables |
31 DEC 2004 |
80 pages |
| Authors:
J. C. Lippold; G.S. Frankel; OHIO STATE UNIV COLUMBUS DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| This project was a SERDP seed grant that was extended from the normal one year duration to a total of two years. The goal of the project was to demonstrate the feasibility of a new approach for welding stainless steel using Cr-free consumables. Stainless steels are usually selected as a material of construction for their corrosion resistance. When they are fabricated into structures, stainless steel components are often joined by ... |
|
| Laser Surface Preparation for Adhesive Bonding II. Task Order 5TS5703D035S |
DEC 2004 |
69 pages |
| Authors:
Craig T. Walters; CRAIG WALTERS ASSOCIATES DUBLIN OH
|
| For several years, research has been undertaken for the U.S. Air Force to assess the utility of pulsed laser beams in the cleaning of surfaces without the use of solvents or abrasives. Initial efforts led to the development of a prototype laser-based cleaning system that could effectively remove paint, contaminants, and oxides from metal surfaces such as aluminum, stainless steel, and titanium. In follow-on research, the basic laser cleaning concepts ... |
|
| Prediction of Ductile Fracture of Thin-Walled Cylinders Subjected to Localized Intense Heat |
30 NOV 2004 |
77 pages |
| Authors:
C. T. Sun; Z. Jin; S. Kalyanam; Nick Bruno; Adam Deitemeyer; PURDUE UNIV LAFAYETTE IN
|
| The objective of this research was to further develop two models that are capable of predicting crack growth in ductile materials. In this study, we measured CTOA (crack tip opening angle) at elevated temperatures for a stainless steel and aluminum alloy 2014-T6. The CTOA curves were then used as the fracture criterion to simulate crack extension and instability in thin-walled cylinders subjected to localized intense heat. The commercial finite element ... |
|
| Microelectromechanical System Pressure Sensor for Projectile Applications |
SEP 2004 |
20 pages |
| Authors:
Eugene Zakar; ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
|
| A miniaturized high pressure sensor for cannon-launched munitions was fabricated, based on microelectromechanical system (MEMS) technology. It uses a 0.5 microns thin film of lead zirconate titanate (PZT) material for producing an electrical charge that is directly proportional to the pressure. The sensor was mounted on a customized stainless steel housing, placed into a high pressure vessel, and tested to a maximum pressure of 40,000 psi. The shape and configuration ... |
|
| Tribology-Related Behaviour of Coated Titanium Ball Screw Mechanisms under Thermal-Vacuum Conditions |
01 JUN 2004 |
12 pages |
| Authors:
Sandro Corradi; Mario Marchetti; Fabio Mazza; UNIVERSITA DEGLI STUDI LA SAPIENZA ROME (ITALY)
|
| Grade 5 Titanium telescopic ball screws have been tested under thermal-vacuum conditions in order to verify performances during on-orbit functioning. A solid multilayer film of Tungsten Carbide/Carbon (WC/C) was deposited on screw surfaces as a lubricant and was then compared with the case of no lubrication, which presently appears promising for many mechanisms. In order to compare experimental results, traditional stainless steel (AISI 4140) mechanisms were also tested and analyzed. ... |
|
| Physical, Chemical, and Mechanical Bonding Concept/Mechanisms for Joining Steel and Composite Sections |
22 APR 2004 |
44 pages |
| Authors:
Vijay Gupta; CALIFORNIA UNIV LOS ANGELES OFFICE OF CONTRACTS AND GRANTS ADMINISTRATION
|
| Silane-based chemistries on stainless steel substrates have been investigated to develop reliable stainless steel/E-glass composite sections. A chemistry has been uncovered that leads to a joint stronger than one of the substrate (composite). Effects of moisture and seawater on the fracture energies of the joints were also determined. Silane layers have been found that control the fracture path through the multilayer joint assembly in a way that improves the long-term ... |
|
| Vacuum Breakdown of Sub-Micrometer Gap with Pointed Electrode |
07 APR 2004 |
2 pages |
| Authors:
Y. Hirata; K. Ozaki; K. Fukatani; T. Takenaka; U. Ikeda; OSAKA UNIV (JAPAN) GRADUATE SCHOOL OF ENGINEERING
|
| Vacuum breakdown of very small gap in the range of 30nm to 2f m, between a pointed cathode of thin tungsten wire and a plane anode of stainless steel, was experimentally investigated. The experimental setup, which consists of both electrodes and precise positioning mechanisms actuated by piezoelectric devices, was installed in scanning electron microscope (SEM). Breakdown voltage decreases with decrease of gap spacing and/or radius of curvature at the tip ... |
|
| Dynamic Recrystallization of Low Stacking Fault Energy Metals |
18 MAR 2004 |
18 pages |
| Authors:
Frank Montheillet; Jean-Philippe Thomas; ECOLE NATIONALE SUPERIEURE DES MINES SAINT-ETIENNE (FRANCE)
|
| Viewgraphs of presentation on the dynamic recrystallization of low stacking fault energy metals. |
|
| Mitigation of FOD and Corrosion Fatigue Damage in 17-4 PH Stainless Steel Compressor Blades With Surface Treatment |
MAR 2004 |
|
| Authors:
Paul S. Prevey; N. Jayaraman; Ravi Ravindranath; LAMBDA RESEARCH CINCINNATI OH
|
| Compressor blades of a military aircraft turbine engine made of 17-4 PH stainless steel have been reported to have blade edge foreign object damage (FOD), corrosion pitting, and erosion damage that reduce fatigue life. This paper reports the findings of a comprehensive investigation of the effect of residual compressive stresses, imparted by various surface treatments, to improve leading edge damage tolerance and active corrosion fatigue performance in a salt water ... |
|
| Pipe Cleaning Using 3M HFE Solvents and the RAAF Oxygen System Pipe Cleaning System |
FEB 2004 |
|
| Authors:
Lyn E. Fletcher; Robert Zugno; Jim Dimas; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION VICTORIA (AUSTRALIA) PLATFORM SCIENCES LAB
|
| This report details the stages in the development of a novel oxygen system pipe cleaning system, and associated cleaning procedures, for use at RAAF oxygen maintenance workshops. This cleaning system uses 3M HFE solvents and pressure vessels for solvent delivery. Detailed test results and procedures are included. These tests covered RAAF oxygen system pipes in various diameters ranging from 1/8" to 1/2" in stainless steel, copper and aluminium, and various ... |
|
| Effective Use of Weld Metal Hydrogen Trapping and Advance Diffusible Hydrogen Sensing |
2004 |
40 pages |
| Authors:
David L. Olson; Yeong-Do Park; COLORADO SCHOOL OF MINES GOLDEN DEPT OF METALLURGICAL ENGINEERING
|
| The development of an advance measuring apparati for diffusible hydrogen content based on electronic, optical and magnetic property measurements was investigated. The effort was to develop a rapid and accurate determination for both steel weld metal diffusible hydrogen content and its distribution. This investigation used the instrumentation acquired by the DURIP grant program. Thermoelectric (Seebeck) coefficient measurements are used to assess hydrogen content in higher strength low alloy steel, nickel-aluminum ... |
|
| CVN-21 Carrier Casing |
19 AUG 2003 |
2 pages |
| Authors:
NATIONAL CENTER FOR DEFENSE MANUFACTURING AND MACHINING LATROBE PA
|
| The part in question was a pump-housing made of 304 Stainless Steel weighing 37,000 lbs., and taking approximately 1400-1500 hours to machine. To be awarded the contract for 4 housings, pricing had to be competitive. Creative machining methods had to be developed and utilized. One problem area was an operation to cut 24 4.25-inch threaded holes 10 inches deep. Other advanced machining methods and techniques were required to reduce the ... |
|
| In-Situ Measurements of Temperature Profiles and Plume Formation at the Surfaces of Samples Irradiated by a Picosecond Laser Pulse Train |
03 JUL 2003 |
53 pages |
| Authors:
J. Grun; R. Fischer; C. K. Manka; R. F. Wenzel; R. Cozzens; NAVAL RESEARCH LAB WASHINGTON DC BEAM PHYSICS BRANCH
|
| One-inch diameter samples of various materials, such as stainless steel, painted and unpainted aluminum, fused silica, and fiberglass composites, were irradiated by a train of picosecond-duration pulses from a free-electron laser at irradiances of 0.5 to 10 kW/cm2. These experiments were the first to examine the lethality of a train of picosecond-duration laser pulses in an irradiance regime relevant to high energy laser lethality, i.e., utilizing laser intensities that have ... |
|
| Development of an Ultrasonic TNT Slurry Analyzer |
JUL 2003 |
20 pages |
| Authors:
Wes Cobb; Paul Betts; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY ARSENAL NJ
|
| The goal of this work was to develop, install, and test an ultrasonic instrument for continuous, nondestructive evaluation of TNT mixtures inside a production melt kettle. A first instrument was installed and tested at a pilot- scale melt kettle in building 810 at the U.S. Army Armament Research, Development and Engineering * Center, Picatinny Arsenal, NJ. This instrument was then lengthened for installation in a full-sized melt kettle on Line ... |
|
| US Navy Evaluation of the High Reynolds' Number Thermal Stability (HiReTS) Test Unit |
23 APR 2003 |
78 pages |
| Authors:
John E. Colbert; Clarence J. Nowack; Richard A. Kamin; Douglas F. Mearns; NAVAL AIR SYSTEMS COMMAND PATUXENT RIVER MD FUELS AND LUBRICANTS DIV
|
| The HiReTS was developed by Shell Global Solutions, Fuels Business Group as a small- scale unit for evaluating the thermal stability of jet fuel prior to shipment to the consumer. The HiReTS was designed to operate at high fuel flow rates through a heated, stainless steel tube (capillary) representative of turbulent flow conditions in actual engine fuel injectors. At the standard operating conditions (SOC), the HiReTS has a Reynolds' Number ... |
|
| Multifunctional Mechatronic Materials |
21 FEB 2003 |
|
| Authors:
Anthony Evans; PRINCETON UNIV NJ OFFICE OF RESEARCH AND PROJECT ADMINISTRATION
|
| Contributions have been made in two basic areas: ultralight structures based on sandwich panels with truss and textile cores, and high authority actuating structures based on the properties of the Kagome system. This final report contains the following studies: (1) Effective Properties of the Octet-truss Lattice Material, by V.S. Deshpande, N.A. Fleck, and M.F. Ashby; (2) Kagome Plate Structures for Actuation, by R.G. Hutchinson, N. Wicks, A.G. Evans, N.A. Fleck, ... |
|
| Materials Research Society Symposium Proceedings Volume 740 Held in Boston, Massachusetts on December 2-6, 2002. Nanomaterials for Structural Applications |
FEB 2003 |
462 pages |
| Authors:
Christopher C. Berndt; Traugott E. Fischer; Ilya Ovid'ko; Ganesh Skandan; Thomas Tsakalakos; MATERIALS RESEARCH SOCIETY WARRENDALE PA
|
| This volume contains selected papers presented at the symposium whose thematic sessions covered nanostructured bulk materials, films, coatings and nanocomposites. These new materials are now being introduced in structural applications, such as wear resistance, plastic forming, and other load bearing applications, Nanophase or nanocrystalline materials are also being used in electronics, refractory, biological and catalytic applications, Progress in a wide range of structural applications for nanomaterials crucially depends on the ... |
|
| Coaxial Injection under Supercritical Conditions |
JAN 2003 |
3 pages |
| Authors:
Bruce Chehroudi; Doug Talley; ENGINEERING RESEARCH AND CONSULTING INC(ERC INC) EDWARDS AFB CA
|
| This work reports on findings from the initial phase of a coaxial injection process under both subcritical and supercritical conditions. The results presented here are part of a systematic investigation of common rocket engine injectors, such as impinging and coaxial designs. Liquid nitrogen (LN2) is injected through a large length-to-diameter ratio circular hole and exposed at the exit to an annular jet of different gases including nitrogen, helium, and argon. ... |
|
| Microstructures and Mechanical Properties of Nanostructured Copper-304 Stainless Steel Multilayers Synthesized by Magnetron Sputtering |
2003 |
7 pages |
| Authors:
X. Zhang; A. Misra; H. Wang; J. D. Embury; R. G. Hoagland; LOS ALAMOS NATIONAL LAB NM MATERIALS SCIENCE AND TECHNOLOGY DIV
|
| Nanostructured Cu/304 stainless steel (SS) multilayers were prepared by magnetron sputtering at room temperature. 304SS has a face-centered cubic (fcc) structure in bulk. However, in the Cu/304SS multi layers, the SS layers exhibited fcc structure for layer thickness of less than or equal to 5 nm. For 304SS layer thickness larger than 5nm, bcc 304SS grains were observed to grow on top of the initial approx. 5 nm of fcc ... |
|
| Study of Five Discrete Interval-Type Groundwater Sampling Devices |
AUG 2002 |
57 pages |
| Authors:
Louise V. Parker; Charles H. Clark; COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
|
| Five relatively newly developed ground- water-sampling devices (the Kabis, HydraSleeve, Discrete Interval, Pneumo-Bailer, and USGS Passive Diffusion Bag PDB samplers) were tested to determine their ability to recover representative concentrations of a variety of analytes, including volatile organics, explosives, pesticides, and metals. The first phase of the study included several standpipe experiments with known concentrations of analytes. In the second phase, the devices were used in the field to sample ... |
|
| Seawater Crevice Corrosion Resistance of Stainless Steels Coated with Silane and Antifouling Paint Systems |
AUG 2002 |
100 pages |
| Authors:
Robert M. Kain; LAQUE CENTER FOR CORROSION TECHNOLOGY INC WRIGHTSVILLE BEACH NC
|
| Normally, stainless steel is utilized without any type of coating whatsoever. However, there are occasions where coatings may be contemplated. One of present interest to the U.S. Navy is that associated with the use of antifouling coatings on ship hulls fabricated of non-magnetic, austenitic stainless steel. Testing in natural seawater has demonstrated that coatings can protect susceptible stainless steel from barnacle related crevice corrosion and localized corrosion at weldments. However, ... |
|
| Experimental Study on the Effect of Misfit and Mismatch of Ship Plating Welds |
JUN 2002 |
|
| Authors:
Robert E. Bebermeyer; MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF MECHANICAL ENGINEERING
|
| Misfits and mismatches in the welding of ship hull plating may affect survivability after explosions, accidents, or other extreme external forces. Experiments, Slip Line Theory (SLT), and Finite Element Analysis (FEA) help to explain the necking, deformation, and mechanisms of fracture of misfit welded plating. The effect of misfits or offsets on both overmatched and evenmatched welds under tension are studied. The tension creates a moment about the offset weld ... |
|
| Resin Composite Restorations: Effect of Energy Density on Properties and Marginal Integrity |
30 MAY 2002 |
229 pages |
| Authors:
Kraig S. Vandewalle; OREGON HEALTH SCIENCES UNIV PORTLAND
|
| Resin composite (Z250, 3M, St Paul, MN) was bonded in bulk with various degrees of cure into Class 2 preparations in extracted human molar teeth. Two control groups consisted of a highly-cured incrementally-placed group and a non-fatigued low- cure group. The restorations were subjected to 1000 thermal-cycles and 500,000 fatigue cycles from 18 to 85 Newtons using a stainless-steel sphere. Marginal integrity was evaluated using visual rating (ridit analysis) and ... |
|
| Demonstration of Temperature Measurement on a Curved Surface Using Thermographic Phosphors |
MAY 2002 |
26 pages |
| Authors:
Jamie Ervin; Christopher Murawski; Charles MacArthur; Minking Chyu; David Bizzak; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH PROPULSION DIRECTORATE
|
| An optical technique for surface temperature measurement based on the fluorescent emission of rare-earth ion-doped phosphors was demonstrated in an experiment with a heated cylinder in cross flow. In this experiment, a uniform heat flux is imposed by applying a constant voltage across the thin stainless- steel cylinder surface to produce surface temperatures between 24 deg. C and 55 deg. C. The fluorescent emission of a thermographic phosphor, lanthanum oxysulfide ... |
|
| Oxygen Source for Underwater Vehicle Fuel Cells |
04 MAR 2002 |
35 pages |
| Authors:
William E. Batton; Kevin D. Hotton; Jonathan A. Peters; Martin Klanchar; BARBER-NICHOLS ENGINEERING CO ARVADA CO
|
| Four successful tests were conducted to demonstrate the usefulness of lithium oxide as a catalyst and manganese as a fuel for the release of oxygen by the decomposition of lithium perchlorate at low temperature. The test apparatus included two stainless vessels, one to hold molten lithium perchlorate and the other the reaction vessel. The molten perchlorate was fed to the reaction vessel using dry nitrogen gas as a driver. Two ... |
|
| High-Power COIL and YAG Laser Welding |
24 JAN 2002 |
9 pages |
| Authors:
Fumio Wani; Tokuhiro Nakabayashi; Akiyoshi Hayakawa; Sachio Suzuki; Kozo Yasuda; KAWASAKI HEAVY INDUSTRIES LTD KOBE (JAPAN)
|
| We have constructed a laser welding system, which enabled high-power laser welding by combining three laser beams of 1 micrometer wavelength. Its wavelength enables optical silica fibers transmission and the flexible system. The heart of this system consists of a 4 kW and a 6 kW Nd:YAG lasers and a 10 kW Chemical Oxygen-Iodine Laser (COIL). The average power of the combined beam is up to over 20 kW. The ... |
|
| Supersonic Flow Field Visualization Studies of the M (infinity) = 6 Price Waverider Planform |
SEP 2001 |
108 pages |
| Authors:
Karl Garcia; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| personic tests of the conical flow derived M(infinity) =6 (design) Price waverider planform were conducted using the Naval Postgraduate School wind tunnel, These tests are part of a continuing effort to study the characteristics of waverider configured vehicles, Two sting-mounted, flat-plate stainless-steel Price waverider planform models were utilized for testing in the NPS 4-inch by 4-inch cross section supersonic blowdown wind tunnel, Tests at Mach numbers of M 1,7, 2,8 ... |
|
| Bond Durability of Grit-Blast and Silane Treated Metallic Adherends Bonded With Room Temperature Curing Adhesives |
JUL 2001 |
|
| Authors:
Andrew Rider; AERONAUTICAL AND MARITIME RESEARCH LAB MELBOURNE (AUSTRALIA)
|
| The "Australian Silane Treatment" has been successfully used for bonded repairs carried out at RAAF Airbases for a number of years. This surface treatment has provided a reliable and non-toxic alternative to surface pre- treatments recommended in Structural Repair Manuals (SRM) for metallic adhesive bonded repairs. Generally, however, the silane treatment has only been applied in bonded repairs involving the use of high temperature curing structural adhesives. The purpose of ... |
|
| Loose-Tube Neutral Tether Fiber Optic Termination Procedure |
JUN 2001 |
|
| Authors:
Martin F. Bowen; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
|
| Neutral tethers for unmanned underwater vehicles may contain a bundle of single-mode, optical fibers that are protected inside flexible stainless steel tubing. To date the author knows of no commercially available systems or kits that substitute for the following procedure, which is a step-by-step method for terminating electro-optical, loose-tube tether assemblies when used in oil- compensated, underwater applications. This procedure alone will not result in a load-bearing assembly. It assumes ... |
|
| Observation of Patterns by Magnetic Force Microcopy in Fe-Alloys with Shape Memory Effect |
APR 2001 |
6 pages |
| Authors:
M. I. DA Silva; J. C. Gonzalez; M. S. Andrade; NORTH CAROLINA STATE UNIV AT RALEIGH ANALYTICAL INSTRUMENTATION FACILITY
|
| In this study, we investigated the magnetic domains of a FeMnSiNiCr stainless steel sample using Magnetic Force Microscope (MFM). We compared the magnetic patterns obtained by scanning the sample with three coated probes with different magnetic properties: Medium magnetic moment (MM), low magnetic moment (LM), and low coercivity (LC). The probe-surface separation was varied between 25 to 300 nm in order to quantify the magnetic microstructure of the sample. A ... |
|
Reports by Keyword(s)
STAINLESS STEEL
