| Measurement of Apparent Temperature in Post-Detonation Fireballs Using Atomic Emission Spectroscopy |
May-2009 |
5 pages |
| Authors:
W K Lewis; C G Rumchik; DAYTON UNIV OH RESEARCH INST
|
 | The energy release dynamics of explosives are of ongoing interest, but the short timescales involved often limit the measurements that can be made during these processes. We have used atomic emission spectroscopy to measure the temperature of fireballs resulting from detonation of charges of Hexahydro-1,3,5-trinitro-1,3,5-triazine doped with barium nitrate. The time-averaged emission spectra indicate an apparent temperature of 3000 K, in good agreement with theoretical predictions. The technique demonstrated herein ... |
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| A Coupled Creep Plasticity Model for Residual Stress Relaxation of a Shot Peened Nickel-Base Superalloy (Postprint) |
Sep-2008 |
12 pages |
| Authors:
Reji John; Dennis J Buchanan; Robert A Brockman; Andrew H Rosenberger; DAYTON UNIV OH RESEARCH INST
|
| Shot peening is a commonly used surface treatment process that imparts compressive residual stresses into the surface of metal components. Compressive residual stresses retard initiation and growth of fatigue cracks. During the component loading history, loading, or during elevated temperature static loading, such as thermal exposure and creep. In these instances, taking full credit for compressive residual stresses would result in a methodical approach for characterizing and modeling residual stress ... |
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| Organizational Effectiveness in the Tanker Airlift Control Center |
01-May-2008 |
35 pages |
| Authors:
Joseph B Lyons; Laura G Militello; Anne K Offner; Greg Padula; Stephanie D Swindler; DAYTON UNIV OH RESEARCH INST
|
| The Tanker Airlift Control Center (TACC) controls more than 1200 aircraft and over 600 missions across 50 countries per day. This complex organization organically adapts to a constantly changing set of missions including wartime efforts, humanitarian relief, response to natural disasters, presidential movement, and many others. As such, the TACC represents a particularly fertile ground for studying organizational change. The research team drew from management and psychology literatures, and from ... |
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| Deep Defect Detection within Thick Multilayer Aircraft Structures Containing Steel Fasteners Using a Giant-Magneto Resistive (GMR) Sensor (Preprint) |
OCT 2007 |
10 pages |
| Authors:
Ray T. Ko; Gary J. Steffes; DAYTON UNIV OH RESEARCH INST
|
| Defect detection within thick multilayer structures containing steel fasteners is a challenging task in eddy current testing due to the magnetic permeability of the fasteners and overall thickness of the structure. To address these issues, a magnet is applied to the fasteners during the inspection to reduce the noise caused by the permeability. Using a GMR sensor coupled with a lock-in amplifier to increase eddy current sensitivity, data is obtained ... |
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| Resonant Frequency Eddy Current Liftoff Measurements for Shot Peening Intensity Assessment in Materials (Preprint) |
JUL 2007 |
10 pages |
| Authors:
Ray T. Ko; Mark P. Blodgett; Shamachary Sathish; Thomas R. Boehnlein; DAYTON UNIV OH RESEARCH INST
|
| The shot peening intensity of nickel base materials has been examined with an innovative eddy current measurement. The goal is to provide a nondestructive tool to quantitatively evaluate the surface conditions after shot peening. Traditionally, the residual stress caused by the shot peening process can be examined by X-ray diffraction. Recent eddy current works have shown promising results in evaluating the small conductivity variation due to the residual stress. This ... |
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| A Coupled Creep-Plasticity Model for Residual Stress Relaxation of a Shot-Peened Nickel-Base Superalloy |
MAY 2007 |
122 pages |
| Authors:
Dennis J. Buchanan; DAYTON UNIV OH RESEARCH INST
|
| Shot peening has been employed in numerous industries for decades to impart beneficial compressive residual stresses on the surface of metal components. Compressive residual stresses retard initiation of surface cracks and therefore improve fatigue resistance and fatigue life. For elastic conditions, accurate fatigue life predictions, including credit for residual stresses, are possible for complex geometries with complicated load histories. For inelastic material behavior, shot-peened residual stresses may change continuously under ... |
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| Nanocomposites Derived from Carbon Nanofibers and a Hyperbranched Poly(Ether-Ketone): In Situ Polymerization, Chain-End Modification, and Properties (Preprint) |
MAY 2007 |
41 pages |
| Authors:
David H. Wang; Peter Mirau; Loon-Seng Tan; Bing Li; Christopher Y. Li; Jong-Beom Baek; DAYTON UNIV OH RESEARCH INST
|
| 5-Phenoxyisophthalic acid, an A2B monomer, was easily polymerized via a Friedel-Crafts acylation in poly(phosphoric acid)/phosphorus pentoxide (PPA/P2O5; 1:4 w/w) medium to form a CO2H-terminated hyperbranched poly(ether-ketone), HPB-PEK. Thus, the polymerization of 5-phenoxyisophthalic acid, in the presence of various amounts (1, 2, 5, 10, 20, 30 and 40 wt%) of vapor-grown carbon nanofibers (VGCNF) was performed under similar reaction conditions. The resulting (HPB-PEK)-g-VGCNF nanocomposites were insoluble in dichlorobenzene or toluene, but ... |
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| Development of Improved and Novel Thermal Control Coatings (Preprint) |
MAY 2007 |
13 pages |
| Authors:
Amber I. Davis; Clifford A. Cerbus; Joel A. Johnson; DAYTON UNIV OH RESEARCH INST
|
| Thermal control coatings (TCCs) play a critical role in the thermal management of space assets through the reflection of incident solar energy and emittance of infrared heat. The development of new thermal control coatings with improved solar energy reflection, infrared emittance, and reduced weight are essential to the design of future space assets that will reside in harsh environments and have increasing constraints on weight. Optimization of pigment particle size ... |
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| Tensile Failure Prediction and Measurement in Composite Scarf Repair (Preprint) |
MAY 2007 |
10 pages |
| Authors:
Endel V. Iarve; Timothy D. Breitzman; Benjamin M. Cook; Gregory A. Schoeppner; David H. Mollenhauer; DAYTON UNIV OH RESEARCH INST
|
| Oversized quasi-isotropic tensile specimens were manufactured from IM6/3501-6 graphite/epoxy prepreg. Seven specimens were scarfed in the center of the panel, and four of the panels were subsequently repaired. The repair patch consisted of a ply-by-ply replacement of the removed material with a FM-300M095 film adhesive placed between the repair patch and the scarfed specimen. The patch and adhesive were then co-cured. The repaired and unrepaired specimens were strain gaged and ... |
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| Image Reconstruction Based Modeling of 3D Textile Composite (Postprint) |
APR 2007 |
22 pages |
| Authors:
Eric Zhou; David Mollenhauer; Endel Iarve; DAYTON UNIV OH RESEARCH INST
|
| Innovative weaving and braiding processes open up a new opportunity for making 3-D textile composites that give significantly damage-tolerant structural response with design flexibility for durable joints, near-net shape processing, etc. To fully understand the mechanical behavior of 3-D textile composites, it is essential to perform analyses to predict effective material properties and damage initiation and growth. In this paper we present a new approach to generating 3-D textile composite ... |
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| Room-Temperature, Near IR Fluorescence of High Optical Quality KTP (Postprint) |
APR 2007 |
10 pages |
| Authors:
S. M. Hegde; K. L. Schepler; R. D. Peterson; D. E. Zelmon; DAYTON UNIV OH RESEARCH INST
|
| We investigated room temperature fluorescence in the 500-900nm spectral region from high optical quality, polished and uncoated KTP crystals from three different commercial vendors. The crystals were all cut into 5x5x5 mm3 cubes with their dielectric axes along the cube edges. The pump source was a tripled Nd:YAG laser operating at 355nm and 7mJ energy having 3ns pulse width and 100Hz pulse repetition rate. Samples from two vendors showed low ... |
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| Quantification of Impact Damage in CMC Thermal Protection Systems Using Thin-Film Piezoelectric Sensors (Preprint) |
MAR 2007 |
12 pages |
| Authors:
Samuel J. Kuhr; James L. Blackshire; DAYTON UNIV OH RESEARCH INST
|
| Thermal protection systems (TPS) are frequently subjected to impacts from micrometeoroids and ground handling during refurbishment. The damage resulting from such impacts can greatly reduce the vehicle's overall ability to resist extreme temperatures. Therefore, it is essential to have a reliable method to detect and quantify the damage resulting from impacts. In this effort, the effectiveness of lightweight thin film piezoelectric sensors was evaluated for impact detection and quantification in ... |
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| Detection of Localized Heat Damage in a Polymer Matrix Composite by Thermo-Elastic Method (Preprint) |
FEB 2007 |
16 pages |
| Authors:
John Welter; Shamachary Sathish; Erik Ripberger; Eric Lindgren; DAYTON UNIV OH RESEARCH INST
|
| Reduction of strength of polymer matrix composites when exposed to high temperatures is a major concern in aerospace industry. Loss of mechanical strength can be measured only through established destructive techniques; there is a need for detection and evaluation of heat damage in PMC. This paper describes a thermo-elastic based non-contact nondestructive technique for detection and evaluation of heat damage in PMC. The efficiency of the material to convert acoustic ... |
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| Stoichiometry and Characterization of Aluminum Oxynitride Thin Films by Ion-Beam-Assisted Pulsed Laser Deposition (Preprint) |
JAN 2007 |
23 pages |
| Authors:
J. S. Zabinski; J. J. Hu; J. E. Bultman; N. A. Pierce; A. A. Voevodin; DAYTON UNIV OH RESEARCH INST
|
| Oxides are inherently stable in air at elevated temperatures and may serve as wear resistant matrices for solid lubricants. Aluminum oxide is a particularly good candidate for a matrix because it has good diffusion barrier properties and modest hardness. Most thin film deposition techniques that are used to grow alumina require high temperatures to impart crystallinity. Crystalline films are about twice as hard as amorphous ones. Unfortunately, the mechanical properties ... |
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| Infrared Damage Detection System (IDDS) for Real-Time, Small-Scale Damage Monitoring |
JAN 2007 |
9 pages |
| Authors:
George A. Hartman; DAYTON UNIV OH RESEARCH INST
|
| Macroscopic damage and final failure of components subjected to repeated loading is preceded by microscopic damage accumulation in localized areas of the component material. The microscopic damage accumulation phase often comprises the majority of the life of the component. Thus, a detailed understanding of the processes involved would be invaluable for material design and life prediction. In metals, these localized damage accumulation areas are usually on the scale of the ... |
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| Nanocomposites Derived From a Low-Color Aromatic Polyimide (CP2) and Amine-Functionalized Vapor-Grown Carbon Nanofibers: In Situ Polymerization and Characterization (Preprint) |
JAN 2007 |
55 pages |
| Authors:
David H. Wang; Michael J. Arlen; Jong-Beom Back; Richard A. Vaia; Loon-Seng Tan; DAYTON UNIV OH RESEARCH INST
|
| Vapor-grown carbon nanofibers (VGCNF) were functionalized with amine-containing pendants via a Friedel-Crafts acylation reaction with 4-(3-aminophenoxy)benzoic acid. The resulting H2N-VGCNF with ca. 5 atom% functionaliztion was in attendance during the polymerization of 2,2-bis(phtalic anhydride)-1,1,1,3,3,3-hexafluoroisopropane (6FDA) and 1,3-bis(3-aminophenoxy)benzene (APB) in N,N-dimethylacetamide (DMAc) to afford a series of polyimide (CP2)-based nanocomposite films, which contained 0.1 to 5.0 wt% of H2N-VGCNF. For comparison purposes, the pristine VGCNF (0.1-5.0 wt%) was also used in ... |
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| The Effect of As-Large-As (ALA) Grains on the High-Temperature Fatigue Life of Waspaloy |
DEC 2006 |
120 pages |
| Authors:
Mandy L. Brogdon; DAYTON UNIV OH RESEARCH INST
|
| Waspaloy is a nickel superalloy that, when processed, may contain as-large-as (ALA) grains in the outer surface of the billet. Many components were manufactured containing this ALA region. The common practice now is to remove the ALA-affected region; however, the effect of these ALA grains in Waspaloy has not directly been studied. To characterize the material and determine the effects of the ALA grains, tensile tests and fatigue tests were ... |
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| Off-Axis Creep Behavior of Oxide/Oxide Nextel(Trademark)720/AS-0 (Preprint) |
NOV 2006 |
23 pages |
| Authors:
Dennis J. Buchanan; Reji John; Larry P. Zawada; DAYTON UNIV OH RESEARCH INST
|
| Oxide/Oxide Ceramic Matrix Composites (CMC) are currently being demonstrated in high-temperature aerospace applications where their oxidation resistance is critical to a successful design. Many applications are engine components that are axisymmetric in shape and subject to axisymmetric thermal and mechanical loadings. Traditionally woven CMC materials used in these components are typically made from 0 deg/90 deg fiber architectures. In many cases the highest stresses are not always coincident with the ... |
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| The Effect of Hard Coated Metals on the Thermo-Oxidative Stability of a Branched Perfluoropolyalklyether Lubricant (Preprint) |
OCT 2006 |
39 pages |
| Authors:
Patrick T. Hellman; Jeffrey S. Zabinski; Lois J. Gschwender; Carl E. Snyder; Andras L. Korenyi-Both; DAYTON UNIV OH RESEARCH INST
|
| M-50 and carburized Pyrowear 675(registered) steel coupons deposited with commercially available physical vapor deposited (PVD) TiN, TiCN, TiAlCN, TiCrCN/TiB4C multilayer, electroless Ni (E-Ni) TiN, and E-Ni TiCN coatings were immersed in a branched perfluoropolyalklyether (PFPAE), Krytox AC(registered), in an oxidative environment at temperatures ranging from 315 to 360 deg C for a duration of 24 hours and compared to uncoated coupons. Coated and uncoated Pyrowear 675(registered) coupons demonstrated superior corrosion ... |
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| Power and Thermal Technology for Air and Space. Delivery Order 0006: Nano-filled Polymers for Electrical Insulation |
OCT 2006 |
17 pages |
| Authors:
Donald A. Klosterman; Mary Galaska; DAYTON UNIV OH RESEARCH INST
|
| The objective of this delivery order was to conduct research aimed at developing nano-filled polymers for electrical insulation. Improved polymers could be used in wiring, cabling, potting compounds, and capacitors. Specifically, this effort involved research in areas such as nano-filler dispersion, bulk sample fabrication, and thin film processing. These activities are designed to contribute to the improvement of highly stressed electrical insulation with a goal of improved mean time before ... |
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| Quick Reaction Evaluation of Materials and Processes. Delivery Order 0010: Bonded Boron Patch Repair Evaluation |
SEP 2006 |
62 pages |
| Authors:
Nick J. Jacobs; DAYTON UNIV OH RESEARCH INST
|
| The C-141 weep-hole repair, performed in the early 1990s, was the first widespread application of a bonded boron composite repair on a critical structure. This program involved the evaluation of the residual strength and integrity of the bonded boron repairs from aircraft that were decommissioned and to be scrapped. A total of 67 residual strength tests were performed, including 54 original bonded boron composite repaired specimens, 4 new bonded repair ... |
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| Corner Crack Propagation in the Presence of Residual Stresses (Preprint) |
MAY 2006 |
12 pages |
| Authors:
A. L. Hutson; M. Huelsman; D. Buchanan; R. John; S. Haering; DAYTON UNIV OH RESEARCH INST
|
| BA technology development program known as Engine Rotor Life Extension (ERLE) has been initiated by the United States Air Force. One of the key technologies being assessed under the ERLE program is the analysis of 3D crack propagation at critical locations in turbine engine components. These critical locations are typically shot peened requiring the ability to predict 3D crack propagation at stress concentration sites in the presence of residual stresses. ... |
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| Beamforming of Lamb Waves for Structural Health Monitoring (Preprint) |
APR 2006 |
11 pages |
| Authors:
Steven E. Olson; Martin P. DeSimio; Mark M. Derriso; DAYTON UNIV OH RESEARCH INST
|
| Structural health monitoring techniques are being developed to reduce operations and support costs, increase availability, and maintain safety of current and future air vehicle systems. The use of Lamb waves, guided elastic waves in a plate, has shown promise in detecting localized damage, such as cracking or corrosion, due to the short wavelengths of the propagating waves. The use of such techniques for structural health monitoring of simple plate and ... |
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| Non-Chromated Coating Systems for Corrosion Protection of Aircraft Aluminum Alloys (Preprint) |
APR 2006 |
14 pages |
| Authors:
N. Voevodin; D. Buhrmaster; V. Balbyshev; A. Khramov; J. Johnson; R. Mantz; DAYTON UNIV OH RESEARCH INST
|
| The Air Force requires the development of an environmentally compliant chromate-free aircraft coating system that meets or exceeds current corrosion protection capabilities. A number of non-chromated pretreatments and primers have been independently developed over the past years. This report compares the corrosion resistance performance of selected fully non-chromate systems to the standard chromate containing coating system. The data identified two non-chromated systems that performed comparably to the standard chromated aircraft ... |
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| Propulsion and PWR Rapid Response Research and Development (R&R) Support: Delivery Order 0030: Study of Hot Deformation of Nanocomposite Rare Earth Magnets |
MAR 2006 |
53 pages |
| Authors:
Shiqiang S. Liu; DAYTON UNIV OH RESEARCH INST
|
| High performance bulk anisotropic nanograin composite Nd2Fe14B/Fe and Nd2Fe14B/Fe-Co magnets were successfully synthesized using hot compacting blended Nd-Fe-B and ?Fe-Co powders or coated ND-Fe-B powders followed by a subsequent hot deformation. Using both techniques, (BH)max could reach 45-55 MGOe. In addition, bulk anisotropic hybrid nanograin Pr2Fe14B/PrCo5 magnets with improved thermal stability were synthesized, and nanograin Sm2(Co, Fe) 17Fe-Co magnets were studied. |
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| Analytical Modeling of Lamb Waves for Structural Health Monitoring (Preprint) |
MAR 2006 |
11 pages |
| Authors:
Steven E. Olson; Martin P. DeSimio; Mark M. Derriso; DAYTON UNIV OH RESEARCH INST
|
| Structural health monitoring techniques are being developed to reduce cost, increase availability, and maintain safety of current and future air vehicle systems. Various techniques have been investigated depending on the scale of the damage to be detected. For example, damage such as fastener failure may have a more global effect on the structural dynamics and therefore modal-based damage detection techniques may be suitable. This paper focuses on detecting smaller scale ... |
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| Composites Containing Barrier Layers for Reduced Permeability at Cryogenic Temperatures |
MAR 2006 |
13 pages |
| Authors:
Vernon T. Bechel; Steven L. Donaldson; Ran Y. Kim; DAYTON UNIV OH RESEARCH INST
|
| To help prevent leakage that may occur if cracks develop in a cryogenic composite pressure vessel due to thermo-mechanical fatigue, liners are occasionally implemented. However, liners can be difficult to fabricate and maintain, and mismatch of their CTE with the underlying composite can promote debonding of the liner. In this effort, two approaches to incorporating a barrier layer directly into a carbon/bismaleimide PMC (IM7/5250-4) were investigated for their effectiveness in ... |
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| User Feedback on RFID and Integrated Flightline Data for Maintenance Decisions |
JAN 2006 |
8 pages |
| Authors:
DAYTON UNIV OH RESEARCH INST
|
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| Implications of Conation for Design: Presentation/Briefing |
08 DEC 2005 |
12 pages |
| Authors:
DAYTON UNIV OH RESEARCH INST
|
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| Aerospace Power Scholarly Research Program. Delivery Order 0011: Single Ionic Conducting Polymer Electrolyte |
DEC 2005 |
19 pages |
| Authors:
Allen Turner; DAYTON UNIV OH RESEARCH INST
|
| This report focuses on the development of a lithium-ion conducting channel as a solid-state electrolyte for rechargeable lithium batteries. Dilithium phthalocyanine (Li2Pc) has been used in this development since it can undergo molecular self-assembly to form the ionically conducting channel. The essential features of the channel are that it is designed such that the anion matrix of the unsaturated macrocycle forms the channel through which the lithium ions move, thus ... |
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| Power and Thermal Technologies for Air and Space. Delivery Order 0001: Single Ionic Conducting Solid-State Electrolyte |
NOV 2005 |
22 pages |
| Authors:
Allen Turner; DAYTON UNIV OH RESEARCH INST
|
| This report focuses on the development of a lithium-ion conducting channel as a solid-state electrolyte for rechargeable lithium batteries through the use of thin films of dilithium phthalocyanine (Li2Pc) which have been solvent cast onto manganese dioxide cathodes. Experimental procedures have been developed which have resulted in the successful deposition of Li2Pc with low ionic resistance. AC impedance measurements and analysis of the equivalent circuit has shown that specific ionic ... |
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| Research and Development (R&D) on Advanced Nonstructural Materials. Delivery Order 0001: Cleaning Efficiency Study of Malabar International and Pall Corporation Portable Fluid Purifiers |
OCT 2005 |
29 pages |
| Authors:
Jr. Snyder Carl E.; Shashi K. Sharma; Lois Gschwender; George W. Fultz; Timothy Jenney; DAYTON UNIV OH RESEARCH INST
|
| Hydraulic fluids are a critical, safety-of-flight material for all Air Force aircraft. Hydraulically actuated mechanisms are responsible for a large number of aircraft functions ranging from highly sophisticated flight controls to applications such as accessory door actuation. The Air Force alone uses approximately 1,000,000 gallons of hydraulic fluid per year, costing over $12M in procurement and disposal costs. Used hydraulic fluid currently is the second largest waste stream for the ... |
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| Nonmetals Test And Evaluation. Delivery Order 0006: Support for Aging Aircraft Technology Transition |
OCT 2005 |
72 pages |
| Authors:
Daniel B. McCray; Jeffery A. Smith; Paul K. Childers; DAYTON UNIV OH RESEARCH INST
|
| The purpose of this effort was to assist the transition of several technologies developed by AFRL/MLSA to Air Force maintenance units. Work on three specific technologies was conducted: (1) sol-gel prebond surface preparations, (2) development of a composite materials database for the design of composite patches and (3) documentation of material and processing repair procedures. The bulk of the effort for this program was on Tasks 1 and 2. Very ... |
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| Nonmetals Test and Evaluation. Delivery Order 0003: Fuel System Materials Compatibility Testing of Fuel Additives for Reducing the Amount of Small Particulate in Turbine Engine Exhaust |
OCT 2005 |
46 pages |
| Authors:
William G. Fortener; Susan S. Saliba; DAYTON UNIV OH RESEARCH INST
|
| Environmental legislation is being drafted by the EPA to reduce small particles in turbine engine exhaust. Six of the most promising fuel additives were chosen for a comparative evaluation as to the material compatibility with the non-metallic materials present on aircraft. These additives were added to JP-8+100 fuel prior to testing. In general, all results showed no significant concerns with the materials tested. |
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| Refueling Tanker Truck Temperature Measurements |
FEB 2005 |
29 pages |
| Authors:
Theodore F. Williams; Marlin D. Vangsness; James R. Shardo; Jamie S. Ervin; DAYTON UNIV OH RESEARCH INST
|
| In support of efforts involving thermal management studies, an instrumentation package was assembled to monitor the temperature of refueling tank trucks (specifically for the Oshkosh Rl1 refueling truck). As part of the program, two trucks were temporarily instrumented at two Air Force bases to log temperatures over a period of 1 to 4 weeks. The first instrumentation installation was performed at WPAFB and the data acquisition covered a 6-day period ... |
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| Design Engineering and Support Program (DESP). Delivery Order RZ16: Effects On Mechanical Properties From Laser Paint Stripping |
FEB 2005 |
63 pages |
| Authors:
DAYTON UNIV OH RESEARCH INST
|
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| High-Performance, Soft Magnetic Laminates for Aerospace Power Systems |
DEC 2004 |
39 pages |
| Authors:
Shiqiang Liu; DAYTON UNIV OH RESEARCH INST
|
| Effort has been made to improve high-temperature (^600 degrees C) creep resistance of Fe-Co-V soft magnetic laminates for aerospace power system applications. An innovative approach has been applied to modify the commercial Hiperco 50 (Fe-Co-V) alloy sheets. This approach includes a small amount of cold deformation (with or slightly more than 3 percent) followed by an anneal at 850 degrees C for 3 hours. After the anneal, very large grains ... |
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| Corrosion Rate Evaluation Procedure (CREP): A Convenient Reliable Method for Determining Corrosion Inhibition Ability of Lubricants (Preprint) |
OCT 2004 |
17 pages |
| Authors:
Marcie B. Roberts; George Fultz; Lois J. Gschwender; Carl E. Snyder; DAYTON UNIV OH RESEARCH INST
|
| The Corrosion Rate Evaluation Procedure (CREP) was first designed as a screening test for corrosion inhibited aerospace gas turbine engine oils as a substitute for the Humidity Cabinet corrosion Test (ASTM D1748) in order to screen large numbers of oils in a short period of time for their ability to prevent rust. The CREP was later adapted for hydraulic fluids and greases because of its simplicity, low cost, and speed. ... |
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| Fuel Cell Support Testing. Delivery Order 0029: Fuel Cells for Aerospace Power |
SEP 2004 |
48 pages |
| Authors:
Binod Kumar; DAYTON UNIV OH RESEARCH INST
|
| The purpose of this effort was the basic advancement of high temperature solid oxide fuel cell electrolyte technology. This paper reports the effects of heterogeneously doped Al2O3 on the ionic conductivity of yttria stabilized zirconia (YSZ). At lower dopant concentration, grain growth occurred and the grain boundaries were re-formed. Subsequent increases in the dopant concentration decreased the transport of oxygen ions. the presence of Al2O3 also leads to a blocking ... |
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| Advanced High Cycle Fatigue Life Assurance Methodologies |
JUL 2004 |
|
| Authors:
J. Gallagher; T. Nicholas; A. Gunderson; J. Ruschau; P. Miedlar; DAYTON UNIV OH RESEARCH INST
|
 | This program was a follow-on effort to a program on improved High Cycle Fatigue (HCF) Life Prediction, the results of which are documented in the final report on that PRDA program. This program continued work on addressing key issues associated with developing, verifying, & implementing a material damage tolerant design methodology capable of predicting HCF limits & material thresholds for Ti-6A1-4V. The methodology development was extended to another titanium alloy, ... |
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| Advanced High Cycle Fatigue (HCF) Life Assurance Methodologies |
JUL 2004 |
1161 pages |
| Authors:
J. Gallagher; T. Nicholas; A. Gunderson; J. Ruschau; P. Miedlar; A. Hutson; g. hardy; D. Walls; C. Annis; R. deLaneuville; DAYTON UNIV OH RESEARCH INST
|
| This program was a follow-on effort to a program on Improved High Cycle Fatigue (HCF) Life Prediction, USAF Contract F33615-96-C-5269, the results of which are documented in the final report on that PRDA program 1. This program continued work on addressing key issues associated with developing, verifying, & implementing a material damage tolerant design methodology capable of predicting HCF limits & material thresholds for Ti-6Al-4V. The methodology development was extended ... |
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| Endurance Pump Test with MIL-PRF-83282 Hydraulic Fluid, Purified with Malabar Purifier |
JUN 2004 |
56 pages |
| Authors:
Shashi K. Sharma; Carl E. Snyder Jr.; Lois J. Gschwender; George W. Fultz; Timothy A. Jenney; DAYTON UNIV OH RESEARCH INST
|
| The possible deterioration of the fluid during use or the potential for the purifier to remove some of the performance improving additives from the fluid as well as the contaminants was investigated. Endurance aircraft hydraulic pump tests under carefully controlled conditions were previously conducted using hydraulic fluid purified with a rotating-disk and vacuum type purifier, the portable purifier manufactured by Pall Corporation, to assess the potential negative effect the fluid ... |
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| Research on Advanced Nondestructive Evaluation (NDE) Methods for Aerospace Structures |
MAR 2004 |
118 pages |
| Authors:
Thomas Boehnlein; Jeffrey Fox; Brian Frock; Edward Klosterman; Ray Ko; DAYTON UNIV OH RESEARCH INST
|
| Efforts were conducted to develop nondestructive acoustic and energy- dispersive x-ray spectroscopy techniques for quantitative determination of residual stress and depth-wise residual stress gradients in aerospace materials. Cross-correlation techniques were studied for precise determination of acoustic velocity as a function of frequency. Studies were conducted using eddy-current techniques with GMR sensors to determine their capabilities for detection and monitoring hidden corrosion in multi-layer aerospace structures. Nonlinear acoustic and eddy-current techniques ... |
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| Advanced Integrated Fuel/Combustion Systems |
JAN 2004 |
309 pages |
| Authors:
S. Zabarnick; J. S. Ervin; M. J. Dewitt; D. R. Ballal; K. E. Binns; DAYTON UNIV OH RESEARCH INST
|
| This report is a compilation of highlights of research accomplishments completed under Contract No. F33615-97-C-2719, "Advanced Integrated Fuel/Combustion Systems," with the Air Force Research Laboratory, Propulsion Directorate, Turbine Engine Division. This report covers work performed during the period September 29, 1997 to December 31, 2003. Research efforts covered a wide range of topics toward development of advanced fuels and combustion systems. These efforts included High Heat Sink Fuels Studies, Low ... |
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| Electronic Flight and Technical Manual Design Guidelines |
OCT 2003 |
54 pages |
| Authors:
Sarah Swierenga; Jesse Walker; Andrea Snead; Canton Donahoo; Laurie Quill; DAYTON UNIV OH RESEARCH INST
|
| The United States military is dedicated to improving processes associated with electronic manuals including generation, dissemination, and utilization of manuals used for reference while working. In this case, electronic manuals refer to both manuals used in flight (electronic flight manuals), and manuals used in support of maintaining aircraft (electronic technical manuals). Among those military organizations working in this area, The United States Air Force (USAF) has been a leader in ... |
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| Core Automated Maintenance System (CAMS) at the Flightline: Nellis AFB Structured Study Test Report |
JUL 2003 |
43 pages |
| Authors:
Megan Gorman; Shilo Anders; Carlton Donahoo; Laurie Quill; Johnnie Jernigan; DAYTON UNIV OH RESEARCH INST
|
| One data collection system the US Air Force uses to capture all aircraft maintenance actions is the Core Automated Maintenance System (CAMS). Infrastructure and hardware are in place at Nellis AFB for CAMS to be used via a mobile device on the flightline. The mobile system at Nellis AFE is referred to as the Nellis AFE CAMS at the Flightline system. This document describes a usability test conducted by the ... |
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| Life Prediction Methodologies for Aerospace Materials Annual Report, 2003 |
JUN 2003 |
314 pages |
| Authors:
N. E. Ashbaugh; R. A. Brockman; D. J. Buchanan; G. A. Hartman; A. L. Hutson; DAYTON UNIV OH RESEARCH INST
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| The ability to predict turbine-engine-materials behavior under operating conditions is an important facet of Phase 0 DARPA Prognostics programs. Studies of nickel-based superalloys - Rene 88DT, IN-100, and Waspaloy -- have been undertaken to assess: (a) baseline mechanical props. of material extracted from retired turbine disks, (b) microstructures of each alloy using optical microscopy and SEM, including OIM, (c) environment and load-history effects on FCG props., and (d) capability of ... |
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| Ceramic Bar-on-Bar Impact Experiments |
MAY 2003 |
26 pages |
| Authors:
N. S. Brar; DAYTON UNIV OH RESEARCH INST
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| Ceramic bar-on-bar (uniaxial stress) experiments are performed to extend uniaxial strain deformation states imposed in flyer plate impact experiments. The major objective of these experiments is to generate a variety of multi axial deformation states for characterizing the failure mechanisms in ceramics and other brittle materials. |
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| Grit-Blast/Silane (GBS) Aluminum Surface Preparation for Structural Adhesive Bonding |
30 APR 2003 |
69 pages |
| Authors:
James J. Mazza; Jason B. Avram; Ronald J. Kuhbander; DAYTON UNIV OH RESEARCH INST
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| A silane surface preparation for on-aircraft adhesive bonding of aluminum, known as the grit-blast/silane (GBS) process, has been optimized. It consists of abrasion using 3M Company Scotch-Brite(R) pads, aluminum oxide grit blast, and application of an epoxy-functional organosilane coupling agent hydrolyzed in water. The surface preparation has advantages for on-aircraft repair since it does not require the use of acids. |
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| Dwell-Time Fatigue Crack Growth in Ni-Base Superalloys |
APR 2003 |
55 pages |
| Authors:
Ashok Saxena; Kip Findley; DAYTON UNIV OH RESEARCH INST
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| The state-of-the-art dwell-time fatigue crack growth models applicable to materials systems such as Waspaloy, Rene'95, Rene'88 and IN 100 were critically assessed. The review included models based on linear elastic fracture mechanics (LEFM) and those based on time dependent fracture mechanics (TDFM). The pertinent creep deformation and time and cycle dependent crack growth rate data on these materials were also collected to enable the evaluation of these models and for ... |
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