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Mar 26, 2021
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xix, 307 p. : 25 cm
Topic: Air Force Research Laboratory (Wright-Patterson Air Force Base, Ohio)
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This short segment from an Air Force news magazine shows some of the airplanes at the Air Force Museum at Wright Patterson Air Force Base, including the B-29, B-36, and B-52 bombers. It is hosted by Capt. Bill Cole, an assistant safety engineer on the B-1 bomber. This film is part of the Periscope Film LLC archive, one of the largest historic military, transportation, and aviation stock footage collections in the USA. Entirely film backed, this material is available for licensing in 24p HD...
Topics: United States Air Force, Wright-Patterson Air Force, Wright-Patterson Air Force Base
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Shipping list no.: 2003-0161-P
Topics: Airplanes, Military -- United States -- Design and construction, Wright-Patterson Air Force Base...
Topics: DTIC Archive, Lindgren,Eric A, Materials and Manufacturing Directorate Wright-Patterson Air Force...
The National Research Council (NRC) issued a report on the exposure of Department of Defense (DOD) personnel to lead (Pb) at firing ranges (NRC, 2013). In this report, they expressed the opinion that the current Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (PEL) was not sufficiently protective of DOD firing range personnel. A need has been identified by the Office of the Deputy Under Secretary of Defense (Installations and Environment) to derive of airborne Pb...
Topics: DTIC Archive, Sweeney,Lisa M, Naval Medical Research Unit Dayton Wright-Patterson Air Force Base,...
Transient electronics is an emerging technology area that lacks proper definitions of what it means to be transient. The purpose of this technical report is to provide a background of the issues related to transient electronic systems and provide a categorization of transience modes to establish a common language for technologists and technology managers. The technical paper can be used as a background document for discussions and internal planning. The scope of this document is limited to the...
Topics: DTIC Archive, Bayraktaroglu,Burhan, AFRL/RYDD Wright-Patterson Air Force Base United States,...
The last 2 decades have produced a vast literature describing relationships between cognitive performance and neuropsychological data. This literature has provided the foundation for countless theories about the neural correlates of cognitive processing and specific theories regarding the role of different cortical areas in human cognition. In this paper, we examine a particular theory - the error likelihood model (Brown & Braver, 2005) - that attempts to account for the function of a...
Topics: DTIC Archive, AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AIR FORCE BASE OH COGNITIVE MODELS AND AGENTS...
During the past fiscal year, researchers with the Air Force Research Laboratorys Combustion Branch made substantial progress in numerous areas including: 1) ultra-compact combustors, 2) inter-turbine burner concepts, 3) bluff-body stabilized turbulent flames, 4) well-stirred reactors for chemical kinetics, and 5) detonation-stabilized turbulent flames.Lean blowout data was collected on propane and jet fuel bluff-body stabilized flames and was combined with data taken from past literature to...
Topics: DTIC Archive, Caswell,Andrew W, Combustion Branch (AFRL/RQTC), Turbine Engine Division...
Shot-peening-induced compressive residual stresses are often introduced in Ni-base superalloy components to help prevent or retard surface fatigue crack initiation and early growth at near surface inclusions. In certain cases these compressive residual stresses can shift the fatigue crack initiation site from surface to sub-surface locations. However, the ability to computationally predict the improvement in fatigue life response and scatter due to induced compressive residual stresses are...
Topics: DTIC Archive, Musinski,William, Materials and Manufacturing Directorate Wright-Patterson Air Force...
This interim technical report summarizes activity on AFRL 6.1 laboratory task LRIR 15RQCOR102 during fiscal year 2016. The objective of this task is to better understand boundary layer transition in hypersonic flow fields with spanwise nonuniformity. Several advances were made under this task during FY16. Quantitative simultaneous infrared thermography and fluctuating pressure measurements on the HIFiRE-5 configuration were made in a quiet flow wind tunnel. These measurements quantified the...
Topics: DTIC Archive, Kimmel,Roger, Hypersonic Sciences Branch Wright-Patterson Air Force Base United...
This paper presents methods for combining process monitoring, thermal modelling and microstructure characterization together to draw process-to-structure relationships in metal additive manufacturing. The paper discusses heterogeneities in the local processing conditions within additively manufactured components and how they affect the resulting material structure. Methods for registering and fusing disparate data sources are presented, and some effort is made to discuss the utility of...
Topics: DTIC Archive, Groeber,M A, AFRL Materials and Manufacturing Directorate Wright Patterson Air Force...
Origami, the art of paper folding, transforms a flat sheet into complex, active or passive art using sequential mathematically defined actions. The goal of this research is to develop methodologies and toolsets necessary to integrate physics-based considerations into these procedures, and thus afford a new design strategy to solve aerospace and challenges with mechanically relevant performance criteria that are faced by Air Force personnel.
Topics: DTIC Archive, Joo,James J, Design and Analysis Branch (AFRL/RQVC), Aerospace Vehicles Division...
The U.S. Air Forces (USAF) Aircraft Structural Integrity Program (ASIP) was established in November 1958 in response to in-flight structural failures. Additional failures in the late 1960s, far short of the qualified safe-life, demonstrated that the safe-life approach had shortcomings. The USAF implemented a damage tolerance approach in response to these failures, recognizing that an aircrafts structure has a wide range of initial quality from manufacturing processes plus service induced damage...
Topics: DTIC Archive, Lindgren,Eric A, Materials and Manufacturing Directorate Wright-Patterson Air Force...
The effect of O3 on C2H4/synthetic-air flame propagation at sub-atmospheric pressure was investigated through detailed experiments and simulations. A Hencken burner provided an ideal platform to interrogate flame speed enhancement, producing a steady, laminar, nearly one-dimensional, minimally curved, weakly stretched, and nearly adiabatic flame that could be accurately compared with simulations. The experimental results showed enhancement of up to 7.5% in flame speed for 11 000ppm of O3 at...
Topics: DTIC Archive, Pinchak,Matthew, US Air Force Research Laboratory Wright-Patterson Air Force Base...
Topics: DTIC Archive, Jones,Aaron M, Layered Sensing Exploitation Division, Radio Frequency Exploitation...
In a previous paper, we introduced a modified Steinmetz equation to account for dc-bias field effects, which requires only a simple dc permeability measurement to predict total power loss. In this paper, we expanded our investigation to include Finemet nanocrystalline material and found that our modified Steinmetz formalism was effective in predicting dc-bias-related losses for this system as well. In this paper, it was observed that Finemet cores exhibit lower losses than Metglas cores under...
Topics: DTIC Archive, Turgu,Zafer, AFRL/RQQE Wright-Patterson Air Force Base United States, power supplies,...
The U.S. Air Forces (USAF) Aircraft Structural Integrity Program (ASIP) was established in November 1958 in response to in-flight structural failures. Additional failures in the late 1960s, far short of the qualified safe-life, demonstrated that the safe-life approach had shortcomings. The USAF implemented a damage tolerance approach in response to these failures, recognizing that an aircrafts structure has a wide range of initial quality from manufacturing processes plus service induced damage...
Topics: DTIC Archive, Lindgren,Eric A, Materials and Manufacturing Directorate Wright-Patterson Air Force...
The spontaneous conversion of a flat film into a 3-D shape requires local programming of the mechanical response. Historically, the ability to locally program the mechanical response of high strain (30 ) liquid crystalline elastomers (LCEs) has been limited to magnetic or mechanical alignment techniques, which limits spatial resolution. Recently, we reported on the preparation of LCEs capable of 55 strain with spatial control of the mechanical response at scales as small as 0.01 mm2. Here, we...
Topics: DTIC Archive, Ware,Taylor H, AFRL Materials and Manufacturing Directorate Wright Patterson Air...
A numerical method was developed for calculating the Rayleigh Surface Wave (RSW) velocity in arbitrarily oriented single crystals in 360 degrees of propagation. This method relies on the results from modern analysis of RSW behavior with the Stroh formalism to restrict the domain in which to search for velocities by rst calculating the limiting velocity. This extension of existing numerical methods also leads to a natural way of determining both the existence of the RSW as well as the...
Topics: DTIC Archive, Cherry,Matthew R, AFRL Materials and Manufacturing Directorate Wright Patterson Air...
Advances in materials are an important contributor to our technological progress, and yet the process of materials discovery and development itself is slow. Our current research process is human-centered, where human researchers design, conduct, analyze and interpret experiments, and then decide what to do next. We have built an Autonomous Research System (ARES)an autonomous research robot capable of first-of-its-kind closed-loop iterative materials experimentation. ARES exploits advances in...
Topics: DTIC Archive, Nikolaev,Pavel, AFRL Materials and Manufacturing Directorate Wright Patterson Air...
Building on recent efforts [1-4] to characterize carbon nanotube fibers (CNFs) and electron emission [5,6] suitable for compact, high power, high frequency, vacuum electronic devices, this paper describes a proposed exhaustive approach towards optimizing CNF field emission (FE) properties. It outlines how a platform geared towards meaningful comparisons between different CNF-based emitters can be developed. The platform envisages an iterative procedure involving (a) the growth, processing, and...
Topics: DTIC Archive, Fairchild,Steven B, Air Force Research Laboratory Wright Patterson Air Force Base...
The U.S. Air Forces (USAF) Aircraft Structural Integrity Program (ASIP) was established in November 1958 in response to in-flight structural failures. Additional failures in the late 1960s, far short of the qualified safe-life, demonstrated that the safe-life approach had shortcomings. The USAF implemented a damage tolerance approach in response to these failures, recognizing that an aircrafts structure has a wide range of initial quality from manufacturing processes plus service induced damage...
Topics: DTIC Archive, Lindgren,Eric A, Materials and Manufacturing Directorate Wright-Patterson Air Force...
With its low work function and high mechanical strength, the LaB6 /VB2 eutectic system is an interesting candidate for high performance thermionic emitters. For the development of device applications, itis important to understand the origin, value, and spatial distribution of the work function in this system. Here we combine thermal emission electron microscopy and low energy electron microscopy with Augerelectron spectroscopy and physical vapor deposition of the constituent elements to explore...
Topics: DTIC Archive, Back,Tyson C, AFRL Materials and Manufacturing Directorate Wright Patterson Air Force...
Previous studies of hypoxia have largely examined different altitudes in isolation. Pilots, however, receive two sequential exposures during in-flight hypoxic emergencies (IFHEs): the initial exposure at altitude, followed by a second mild exposure after descending and removing the breathing mask. Conventional wisdom holds that performance recovers with blood oxygen saturation and that exposure to mild hypoxia is safe, but recent studies have challenged these assumptions. This study examined...
Topics: DTIC Archive, Robinson,Frank E, Naval Medical Research Unit Dayton Wright-Patterson Air Force Base...
This thesis develops and implements a process to rapidly respond to host level security events using a host agent, Software Defined Networking and OpenFlow updates, role based flow classes, and Advanced Messaging Queuing Protocol to automatically update configuration of switching devices and block malicious traffic. Results show flow table updates are made for all tested levels in less than 5.27 milliseconds and event completion time increased with treatment level as expected. As the number of...
Topics: DTIC Archive, Todd , Michael C, Air Force Institute of Technology Wright-Patterson Air Force Base...
High-fidelity simulation was employed to address several complex unsteady interactions important to future USAF air vehicles. The research described in this report was focused on three key elements: 1. Vortex interactions in formation flight. 2. Dynamic stall. 3. Plasma-based transition control.
Topics: DTIC Archive, Visbal,Miguel R, Aerodynamic Technology Branch (AFRL/RQVA) Wright-Patterson Air Force...
Flow visualization measurement techniques, namely high-speed schlieren and two-photon Kr planar laser-induced fluorescence (PLIF at 10-Hz repetition rate), were developed and implemented in a new AFRL Mach-6 Ludwieg Tube Hypersonic Wind Tunnel. Because of its high frame rates, the schlieren technique was first employed to image the starting shock and the entire startup process. These schlieren images also helped interpret the pressure measurements during the startup process and characterize the...
Topics: DTIC Archive, Kimmel,Roger L, Hypersonic Sciences Branch WRIGHT-PATTERSON AIR FORCE BASE United...
The focus of this study was to evaluate the toxicity of ten jet fuels of interest to the United States Department of Defense. Specifically, this study aimed to determine the potential of the jet fuels to induce DNA damage that may lead to genetic mutations. All of the jet fuels tested were considered to be negative for mutagenicity in the bacterial reverse mutation assay using Salmonella and E. coli strains. Based on the parameters used in this in vitro study, Citgo JP8 (POSF 4658), Valero 25...
Topics: DTIC Archive, Mumy,Karen L, Naval Medical Research Unit Dayton Wright-Patterson Air Force Base, jet...
This interim technical report summarizes technical activity on AFRL 6.1 laboratory task LRIR 15RQCOR102 during fiscal year 2017. The objective of this task is to better understand boundary layer transition in hypersonic flowfields with spanwise nonuniformity. Several advances were made under this task during FY17. The HIFiRE-5b flight data were analyzed. Wind tunnel tests were conducted at angles of attack and yaw representative of flight, and computations were carried out for the flight...
Topics: DTIC Archive, Kimmel,Roger, Hypersonic Sciences Branch Wright-Patterson Air Force Base, flow...
Ignition of an ethylene fueled cavity in a supersonic flow was achieved through the application of two energy deposition techniques: a spark discharge and pulse detonator (PD). High-frequency shadow graph and chemiluminescence imaging showed that the spark discharge ignition was passive with the ignition kernel and ensuing flame propagation following the cavity flow field. The PD produced a high-pressure and temperature exhaust that allowed for ignition at lower tunnel temperatures and...
Topics: DTIC Archive, Ombrello,Timothy M, U.S. Air Force Research Laboratory Wright-Patterson Air Force...
A simple thermodynamic criterion is proposed to predict the presence or absence of equilibrium intermetallic phases in a high entropy alloy at a given temperature T. The criterion was verified using 45 currently available HEAs, for which equilibrium phases and respective annealing temperature are reported. The present model shows good correlation with experiment and gives an improved ability to predict formation of solid solution and intermetallic phases compared to earlier models.
Topics: DTIC Archive, Senkov,O N, AFRL Materials and Manufacturing Directorate Wright Patterson Air Force...
A dedicated experimental test program characterized the mechanical behavior of a melt infiltrated SiC/SiC ceramic matrix composite material at room and elevated temperature. This report describes tensile, creep, and fatigue testing procedures and presents the results.
Topics: DTIC Archive, Zawada,Larry P, Air Force Research Laboratory Wright Patterson Air Force Base United...
Though not often mentioned, the price point of many eye tracking systems may be a factor limiting their adoption in research. Recently, several inexpensive eye trackers have appeared on the market, but to date little systematic research has been conducted to validate these systems. The present experiment attempted to address this gap by evaluating and comparing five different eye trackers, the Eye Tribe Tracker, Tobii EyeX, Seeing Machines faceLAB, Smart Eye Pro, and Smart Eye Aurora for their...
Topics: DTIC Archive, Funke,Gregory, Air Force Research Laboratory, Wright-Patterson Air Force Base United...
Peak amplitudes of mode converted shear wave signals back scattered from macro-texture regions (MTRs) in an aerospace grade titanium alloy material are measured to be about the same level as corner trapped shear wave signals. In addition to the abnormally high shear wave responses, the time of flight data indicates that the MTR signals are back scattered from a location deep in the sample so that the round trip travel time is close to that of corner trapped signals. In this work, these two...
Topics: DTIC Archive, Blackshire,James L, AFRL Materials and Manufacturing Directorate Wright Patterson Air...
The U.S. Air Forces (USAF) Aircraft Structural Integrity Program (ASIP) was established in November 1958 in response to in-flight structural failures. Additional failures in the late 1960s, far short of the qualified safe-life, demonstrated that the safe-life approach had shortcomings. The USAF implemented a damage tolerance approach in response to these failures, recognizing that an aircrafts structure has a wide range of initial quality from manufacturing processes plus service induced damage...
Topics: DTIC Archive, Lindgren,Eric A, Materials and Manufacturing Directorate Wright Patterson Air Force...
The rapid heating of carbon-fiber-reinforced polymer matrix composites leads to complex thermophysical interactions which not only are dependent on the thermal properties of the constituents and microstructure but are also dependent on the thermal transport between the fiber and resin interfaces. Using atomistic molecular dynamics simulations, the thermal conductance across the interface between a carbon-fiber near-surface region and bismaleimide monomer matrix is calculated as a function of...
Topics: DTIC Archive, Varshney,Vikas, AFRL Materials and Manufacturing Directorate Wright Patterson Air...
The aim of this study was to examine the effects of uncertainty about where in the field of view critical signals for detection appear during a vigilance task (spatial uncertainty) on cerebral blood flow velocity (CBFV) and oculomotor fatigue. Background: Neuroergonomics is a dimension of human factors founded by Raja Parasuraman that studies brain functions underlying performance at work. Neuroergonomic studies have shown that observers in vigilance tasks lose information processing resources...
Topics: DTIC Archive, Funke,Matthew E, Naval Medical Research Unit Dayton Wright-Patterson Air Force Base...
An assessment was conducted to determine the suitability of subscale, low-Mach-number, particle image velocimetry (PIV) testing and computational fluid dynamics (CFD) analysis to evaluate swirling flow downstream of a swirl pattern generation system composed of continuous patterns of turning vanes. Successful demonstration of the evaluation methods required acceptable comparison of the PIV and CFD to an independent five-hole probe measurement performed at the design Mach number and full-scale...
Topics: DTIC Archive, Sanders,Darius D, Turbomachinery Branch, Turbine Engine Division Wright-Patterson Air...
In this work, electrical capacitance tomography (ECT) and neural networks were used to automatically identifytwo-phase flow patterns for refrigerant R-134a flowing in a horizontal tube. In laboratory experiments, highspeedimages were recorded for human classification of liquidvapor flow patterns. The correspondingpermittivity data obtained from tomograms was then used to train feedforward neural networks to recognizeflow patterns. An objective was to determine which subsets of data derived from...
Topics: DTIC Archive, Roman,Abdeel J, Mechanical and Thermal Systems Branch, Power and Control Division...
A dedicated experimental test program characterized the durability behavior of A500(Restricted) C/SiC ceramic matrix composite material at room and elevated temperature. Specimens were exposed to salt fog and then burner rig thermal cycles. This report describes the conditioning and the residual tensile behavior after exposure.
Topics: DTIC Archive, Zawada,Larry P, AFRL/RXCC Composites Branch, Structural Materials Division Wright...
The KC-46A Tanker Modernization (KC-46A) will replace the U.S. Air Force's aging fleet of Tankers which have been the primary refueling aircraft for more than 50 years. The KC-46A will have enhanced refueling capabilities with greater capacity, and both cargo and aeromedical evacuation with improved efficiency and increased capabilities. The KC-46A will provide aerial refueling support to the United States Air Force, Navy, and Marine Corps, as well as allied nation coalition aircraft. The...
Topics: DTIC Archive, Richardson ,Duke Z, U.S. Air Force Wright-Patterson Air Force Base United States,...
This report presents the data and findings for the analysis of two aviation fuels using the fuel system simulator (FSS).One is a commercially sourced Jet A, referred to as Gulf Coast, which meets all criteria in the Jet A specification. The other fuel is an F-24 obtained from Fort McCoy Garrison in Wisconsin. The F-24 fuel, referred to as McCoy, when initially received at Fort McCoy, failed the Jet Fuel Thermal Oxidative Test (JFTOT) breakpoint criteria. The analysis ofthe fuels using the FSS...
Topics: DTIC Archive, Morris,Robert Jr W, Fuels Branch, Turbine Engine Division, Air Force Research...
The study examined both the pharmacokinetic properties and efficacy of a low-dose, aqueous, intranasal scopolamine spray (INSCOP) as an anti-motion sickness prophylaxis. The study was divided into two phases: a pharmacokinetics (PK) phase, which established pharmacokinetic parameters, and an Efficacy phase, which was a within-subjects, cross-over, double blind, placebo controlled trial testing the efficacy of INSCOP during mechanical rotation. Cognitive testing, blood samples, subjective...
Topics: DTIC Archive, Geyer,Daniel J, Naval Medical Research Unit - Dayton Wright-Patterson Air Force Base...
Layered transition metal dichalcogenides (TMDs) are an emerging class of 2-dimensional materials due to their diverse property suite, which range from semiconducting and semimetallic to metallic and superconducting.1 Their lamellar structure consists of a transition metal layer (M) sandwiched between two chalcogen layers (X) with strong M-X intralayer bonding. These layers are separated by a weak van der waals gap. At the few- to mono-layer limit, coupling between layers is reduced, in-plane...
Topics: DTIC Archive, Jawaid,Ali, Air Force Research Laboratory Wright Patterson Air Force Base United...
Advances in the fundamental understanding of microstructure evolution and plastic flow during primary and secondary processing of titanium alloys are summarized. Examples focus on the recrystallization of the beta phase and spheroidization of alpha lamellae during the breakdown of alpha/beta titanium alloys, challenges in the rolling of foil of alpha/beta and gamma-TiAl alloys, and the effect of microstructure and composition on the superplastic flow behavior of alpha/beta titanium alloys....
Topics: DTIC Archive, Semiatin,S L, Air Force Research Laboratory (AFRL) Materials and Manufacturing...
LiTbF4 has the potential to replace traditional magneto-optic (MO) garnet materials as a Faraday rotator in high power laser systems due to its high Verdet constant. New measurements are reported of the ordinary and extraordinary refractive indices of LiTbF4 as functions of wavelength and temperature respectively, as well as their corresponding Sellmeier expressions. Consequently, the Verdet coefficient was calculated and plotted as a function of wavelength and temperature. These measurements...
Topics: DTIC Archive, Zelmon,David E, AFRL Materials and Manufacturing Directorate Wright Patterson Air...
Synthetic approaches to prepare designer materials that localize deformation, by combining rigidity and compliance in a single material, have been widely sought. Bottom-up approaches, such as the self-organization of liquid crystals, offer potential advantages over topdown patterning methods such as photolithographic control of crosslink density, relating to the ease of preparation and fidelity of resolution. Here, we report on the directed self-assembly of materials with spatial and...
Topics: DTIC Archive, Ware ,Taylor H, AFRL Materials and Manufacturing Directorate Wright Patterson Air...
beta-Ga2O3 based devices show great promise for power switching applications based on metrics such as Baligas Figure of Merit (FOM), exceeding Si by orders of magnitude and even exceeding emerging wide bandgap materials such as GaN and SiC. This and similar FOMs are valuable metrics to assess the promise of a material for an application. They allow materials to be compared to each other under the assumption that the ideal device can be fabricated for each material, and additionally that no...
Topics: DTIC Archive, Heller,Eric, Air Force Research Laboratory Wright Patterson Air Force Base United...
Performance effects due to insufficient sleep have been documented for decades. Given the prevalence of caffeine as a fatigue countermeasure among military personnel, and the availability of modafinil to select populations, commanders and medical staff have expressed concern over the safety of potentially combining the two alertness aids. The present study compared the combined effects of modafinil and caffeine with those of either substance alone during 35 h of continuous wakefulness....
Topics: DTIC Archive, Caldwell,J L, Naval Medical Research Unit Dayton Wright-Patterson Air Force Base...
Microstructural and mechanical characterization of SiC/SiNC ceramic-matrix composite (CMC) materials was conducted. Materials investigated in this study were woven composite systems in both 2-D and 3-D weave architectures. Two matrix precursors were evaluated for tensile, creep, and shear applications: the standard S200-1 and the Starfire(registered trademark) resin systems. In addition, two different ply thicknesses were evaluated: a 4-ply, 0.080-inch laminate and a 9-ply, 0.145-inch material.
Topics: DTIC Archive, Zawada,Larry P, AFRL Materials and Manufacturing Directorate Wright Patterson Air...
