| 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 ... |
|
| 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 ... |
|
| 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 ... |
|
| 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
|
| 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 ... |
|
| Ceramic Bar-on-Bar Impact Experiments |
MAY 2003 |
26 pages |
| Authors:
N. S. Brar; DAYTON UNIV OH RESEARCH INST
|
| 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. |
|
| 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
|
| 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. |
|
| Dwell-Time Fatigue Crack Growth in Ni-Base Superalloys |
APR 2003 |
55 pages |
| Authors:
Ashok Saxena; Kip Findley; DAYTON UNIV OH RESEARCH INST
|
| 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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| Point of Maintenance Hurlburt Initial Structured Study Test Report |
MAR 2003 |
26 pages |
| Authors:
Megan Gorman; Carlton Donahoo; Laurie Quill; Johnnie Jernigan; Matthew W. Goddard; DAYTON UNIV OH RESEARCH INST
|
| 13 ABSTRACT (Maximum 200 words) This document describes the usability test conducted by the Air Force Research Laboratory, Logistics Readiness Branch (AFRL/HESR) and the University of Dayton Research Institute (UDRI) to assess user performance with the Point of Maintenance (POMX) system for maintenance data collection on the flightline. This test consisted of observations of task performance in baseline Corps Automated Maintenance System (CAMS) and batch POMX conditions, and feedback questionnaires ... |
|
| The Wipe Solvent Program: Delivery Order 0005: Fluids, Lubricants, and Related Materials |
FEB 2003 |
41 pages |
| Authors:
Marcie B. Roberts; Lois J. Gschwender; Carl E. Snyder Jr; DAYTON UNIV OH RESEARCH INST
|
| Freon 113 TF(Registered) solvent, 1,1,2 -trichloroethane (Freon 113(Registered)) was widely used to clean equipment. With the banning of many halogenated solvents due to ozone depleting tendencies, users desperately sought substitute environmentally friendly solvents. In many cases, the substitutes did not work as well and had other issues that made them less than ideal. Often, it was difficult to assess various solvents based on the manufacturers' claims. In this work, which ... |
|
| The Pivotal Role and Current Status of Nondestructive Inspection Systems in the Maintenance of Aging Aircraft |
FEB 2003 |
14 pages |
| Authors:
J. P. Gallagher; W. C. Hoppe; Alan Berens; David Stubbs; Charles Buynak; DAYTON UNIV OH RESEARCH INST
|
| This paper discusses the pivotal role that Nondestructive Inspection (NDI) plays not only for maintaining safety through early crack detection in airframes and engines, but also for minimizing corrosion maintenance costs. The paper is based on multiple projects that have supported developing and validating NDI systems for crack detection in airframe and engine components and for corrosion detection in airframe structures. These projects have led to a new understanding of ... |
|
| Point of Maintenance Ruggedized Operational Device Evaluation and Observation Test Report |
NOV 2002 |
114 pages |
| Authors:
Megan Gorman; Carlton Donahoo; Laurie Quill; Johnnie Jernigan; DAYTON UNIV OH RESEARCH INST
|
| The Air Force Directorate of Maintenance (USAF/ILM) and the Standard Systems Group, Maintenance Systems Division (HQ SSG/ILM) sponsored an evaluation test for the purpose of identifying potential electronic tools for use at the flightline point of maintenance. The Air Force Research Laboratory, Logistics Readiness Branch (AFRL/HESR) and the University of Dayton Research Institute (UDRI) were commissioned by SSG/ILM to independently and objectively perform the evaluation. The evaluation was conducted at ... |
|
| Analysis and Support Initiative for Structural Technology (ASIST) delivery Order 0016: USAF Damage Tolerant Design Handbook: Guidelines For the Analysis and Design of Damage Tolerant Aircraft Structures |
NOV 2002 |
835 pages |
| Authors:
Peggy C. Miedlar; Alan P. Berens; Allan Gunderson; J. P. Gallagher; DAYTON UNIV OH RESEARCH INST
|
| This is the revised U.S. Air Force Damage Tolerant Design Handbook. The technical content of the 2002 edition is enhanced by the addition of new developments in the areas of corrosion, widespread fatigue damage, and probabilistic methods. New sample problems are included which illustrate the stress intensity factor calculation, fatigue crack life prediction, residual strength risk assessment, resistance curves, inspection intervals, and analysis of aircraft areas, including longeron, wing spars, ... |
|
| Life Prediction Methodologies for Aerospace Materials Annual Report, 2002 |
JUN 2002 |
250 pages |
| Authors:
N. E. Ashbaugh; R. A. Brockman; D. J. Buchanan; G. A. Hartman; A. L. Hutson; DAYTON UNIV OH RESEARCH INST
|
| Three types of models to predict behavior of gamma titanium aluminide (g-TiAl) alloys in a high temperature turbine engine environment were developed and have been refined: (a) a model to evaluate linear elastic response, (b) a crystal plasticity model, and (c) a computational model for analyzing stress variations within polycrystals of g-TiAl. Orientation-imaging microscopy (OIM) has been used to understand the role that crystallographic orientation plays with respect to fatigue ... |
|
| New Technique for Achieving Impact Velocities Greater Than 10km/sec. |
MAY 2002 |
|
| Authors:
A. J. Piekutowski; DAYTON UNIV OH RESEARCH INST
|
| This Contractor Report describes and presents the results of work that was done in an attempt to develop an augmented acceleration technique that would launch small projectiles of known shape, mass, and state to velocities of 10 km/sec and higher. The higher velocities were to be achieved by adding a third stage to a conventional two-stage, light-gas gun and using a modified firing cycle for the third stage. The technique ... |
|
| Aerospace Composite Materials Delivery Order 0003: Nanocomposite Polymeric Resin Enhancements for Improved Composite Performance |
MAR 2002 |
38 pages |
| Authors:
Chenggang Chen; DAYTON UNIV OH RESEARCH INST
|
| Epoxy nanocomposites were successfully prepared using different montmorillonite-based organoclays with an epoxy resin system including several added to fiber preforms. The cation exchange capacity of the clays was the most important factor affecting the clay exfoliation. The addition of clays does not significantly alter the viscosity or cure kinetics so that the modified resin will still be suitable for liquid composite molding techniques such as resin transfer molding. The cure ... |
|
| Aerospace Composite Materials: Delivery Order 0002: Development and Validation of Micromechanical Models for Composites |
MAR 2002 |
167 pages |
| Authors:
V. Buryachenko; E. Iarve; R. Kim; S. Sihn; G. P. Tandon; DAYTON UNIV OH RESEARCH INST
|
| Mechanics modeling and verification of a variety of systems continues to be examined. Systems successfully examined include the single filament cruciform test, identification of failure modes in composites, woven fabric composite, carbon foams, the fiber pushout test, and slanted free-edge plies. Techniques used include concentric cylinder modeling, finite element method, B- spline approximation, and in situ observation of damage during testing via scanning electron microscopy (SEM). The iteration method was ... |
|
| The Evaluation of Ambient-Temperature Processes for Repair Bonding of Aluminum Alloys |
JAN 2002 |
33 pages |
| Authors:
Daniel B. McCray; DAYTON UNIV OH RESEARCH INST
|
| On-aircraft adhesive bonding of metal substrates typically requires the use of impractical surface preparation processes in order to attain the desired bonded joint strength and durability. Surface preparations currently used for on-aircraft repairs rely on hazardous materials and/or inconvenient processing steps, or they do not yield adequate bond performance. Many U.S. Air Force Technical Orders (T.O.s) require the use of surface preparations such as phosphoric acid anodize (PAA) or acid ... |
|
| Point of Maintenance Usability Study Final Report (Spiral 1 Usability Test, Spiral 3 Synthetic Usability Test, and Spiral 3 Field Usability Test) |
JAN 2002 |
93 pages |
| Authors:
Carlton Donahoo; Megan Gorman; David Kancler; Laurie Quill; Allen R. Revels; DAYTON UNIV OH RESEARCH INST
|
| The goal of the Point of Maintenance (P-O-Mx) program is to demonstrate timely, accurate, and effective data collection, and logistics operations processing to meet the maintainer's needs at the point of origin. As part of the P-O-Mx efforts, the Air Force Research Laboratory, Logistics Readiness Branch (AFRL/HESR) funded a series of Human Factors usability tests for the purpose of evaluating the maintenance hardware devices to be used at the Point ... |
|
| Self-Etch Environmentally Acceptable Primer Testing (SEEAPT) Deliver Order 0001 |
DEC 2001 |
82 pages |
| Authors:
Christopher A. Joseph; DAYTON UNIV OH RESEARCH INST
|
| Self-etching and wash primers have the potential to reduce depot and field flow times and related wasted streams by combining several steps in the coating application process. These materials have been used with limited success. A project was initiated to ascertain the state-of-the-art with these materials. An initial screening was completed with 12 candidate self-etching and wash primers under current MIL-PRE-85285 topcoats. The focus of the testing was on primer ... |
|
| Fuel and Fuel System Materials Compatibility Test Program for A JP-8+100 Fuel Additive. Volume 1: Thermal Stability Additive Package BetzDearborn Spec Aid(Registered) 8Q462 |
OCT 2001 |
385 pages |
| Authors:
Dexter Kalt; Marlin Vangsness; Benjamin Wilt; Susan Saliba; John Dues; DAYTON UNIV OH RESEARCH INST
|
| This report describes a program inaugurated to test the compatibility of aircraft fuel system materials with a JP-8 fuel containing a new thermal stability additive (TSA) package. The JP-8 fuel containing this new TSA is commonly referred to as JP-8+100. (The "+100" refers to the expected 100 deg F increase in thermal stability range of fuel containing the additive over the thermal stability range of JP-8 fuel.) In this test ... |
|
| Automated Corrosion Detection Program |
OCT 2001 |
117 pages |
| Authors:
Wally Hoppe; Jennifer Pierce; Ollie Scott; DAYTON UNIV OH RESEARCH INST
|
| An evaluation of several hidden corrosion-detection technologies was performed using a probability of detection (POD) method for percent material loss that is similar to well -established crack detection assessment methods. Several other tasks were performed, with overall goal of contribution to aging aircraft maintainability improvement. Automation concepts were studied and tested for improved speed and accuracy. Nondestructive Evaluation (NDE) requirements were surveyed within the industry for issues and needs pertaining ... |
|
| Point of Maintenance Spiral One Usability Study |
AUG 2001 |
34 pages |
| Authors:
Carlton Donahoo; Megan Gorman; David Kancler; Laurie Quill; Allen R. Revels; DAYTON UNIV OH RESEARCH INST
|
| The goal of the Point of Maintenance (P-O-Mx) program is to demonstrate timely, accurate, and effective data collection, and logistics operations processing to meet the maintainer's needs at the point of origin. The Spiral One Usability Test consisted of human factors and user-centered evaluations of the P-O-Mx activity. User level evaluations were conducted to determine the maintenance effectiveness of P-O-Mx devices in presenting, modifying, and transmitting maintenance and service data. ... |
|
| Life Prediction Methodologies for Aerospace Materials |
JUN 2001 |
246 pages |
| Authors:
N. E. Ashbaugh; R. A. Brockman; D. J. Buchanan; G. A. Hartman; A. L. Hutson; DAYTON UNIV OH RESEARCH INST
|
| Damage tolerance investigations of gamma-TiAl alloys have involved assessments of lamellar lath orientations of colonies and defects in large-scale production ingots. An investigation of elastic properties of colonies has continued with conjoint efforts in the experimental evaluation of test specimens containing large colonies and in finite element analysis of modeling of the contiguous colony locations and orientations within the test specimens. Experimental behavior of Nextel TM720/AS ceramic matrix composite was ... |
|
| Ionically Conducting Polymer Electrolytes |
JUN 2001 |
72 pages |
| Authors:
Bindo Kumar; DAYTON UNIV OH RESEARCH INST
|
| This report presents an investigation on the development of composite electrolytes for lithium batteries. The investigation covers a diverse range of composite electrolyte compositions and reveals that the incorporation of a ceramic component in a polymer matrix leads to enhanced conductivity. The conductivity enhancement depends upon the weight fraction of the ceramic phase, annealing parameters, nature of polymer-ceramic system, and temperature. The roles of ceramic additives are to depress the ... |
|
| Nonmetals Test and Evaluation: Delivery Order 0007: The Development of On-Aircraft Surface Preparations Utilizing Sol-Gel Coatings for Adhesive Bonding Aluminum Alloys |
MAY 2001 |
91 pages |
| Authors:
Daniel B. McCray; DAYTON UNIV OH RESEARCH INST
|
| High-performance surface preparations for adhesive bonding of metals typically require the use of strong acids or bases, volatile organic compounds (VOCs), and hexavalent chromium. Surface preparations used for on-aircraft repair of aluminum rely on hazardous materials or inconvenient processing steps, or they do not yield adequate bond performance. Grit-blast/silane (GBS)', phosphoric acid containment system (PACS)2, which is a version of phosphoric acid anodize (PAA)3, and certain acid paste etches are ... |
|
| Polymer Matrix Composite (PMC) Damage Tolerance and Repair Technology |
APR 2001 |
27 pages |
| Authors:
Ran Y. Kim; DAYTON UNIV OH RESEARCH INST
|
| The application of composites in space structures such as reusable launch vehicles requires a detailed understanding of their mechanical behavior and damage resistance in the service environment. Experimental and analytical studies were conducted on IM7/977-3, a graphite-toughened epoxy, to characterize the influence of cryogenic service temperatures on the strength, modulus, and fracture of this material system, and on transverse crack initiation in cross- ply laminates at 23, -129, and -196 ... |
|
| Evaluating Aircrew and Maintainer Warfighter Performance in Aeronautical Systems using Mission-Oriented Measures of Effectiveness |
FEB 2001 |
266 pages |
| Authors:
P. S. Best; Frank C. Gentner; Paul H. Cunningham; Terrence C. Tiller; Aaron W. Schopper; DAYTON UNIV OH RESEARCH INST
|
| Manpower, Personnel, and Training (MPT) research and development (R&D) traditionally validates its products and procedures using outcome criteria such as end-of-course grades, time to master, cost-benefit analyses, or sometimes by job performance indices. However, R&D funders react more favorably to research outcomes linked to warfighting capabilities and readiness impacts. Therefore, incorporating these criteria into MPT R&D is critical to future success. The Air Force Research Laboratory commissioned the present effort ... |
|
| Intrinsically Survivable Structural Composite Materials |
FEB 2001 |
52 pages |
| Authors:
David P. Anderson; Chenggang Chen; Larry Cloos; Thao Gibson; DAYTON UNIV OH RESEARCH INST
|
| Three aspects of nanocomposite materials were examined in this project: spherical silicates, commercial layered silicates, and synthetically modified layered silicates. Aerospace epoxy resins were used throughout with primary focus on the resin transfer molding (RTM) grade Epon 862/Cure W. |
|
| Improved High-Cycle Fatigue (HCF) Life Prediction |
JAN 2001 |
1154 pages |
| Authors:
J. P. Gallagher; R. H. Van Stone; R. E. deLaneuville; P. Gravett; R. S. Bellows; DAYTON UNIV OH RESEARCH INST
|
| An overall building block approach facilitated the development and adaptation of models for immediate application to each of the three in-service generated damage states (the foreign object damage (FOD) and fretting damage models are dependent on the low cycle fatigue / high cycle fatigue (LCF/HCF) and base-line models). The program demonstrated the overall approach for developing methods that can be adapted and integrated into engine company design practices. Approaches and ... |
|
| Life Prediction Methodologies for Aerospace Materials |
JAN 2001 |
162 pages |
| Authors:
N. E. Ashbaugh; R. A. Brockman; D. J. Buchanan; G. A. Hartman; A. L. Hutson; DAYTON UNIV OH RESEARCH INST
|
| The understanding of the effect of material defects, i.e., inclusions and grain size variances, on tensile and fatigue behavior, specifically initiation, in wrought gamma titanium aluminides was improved. Orientation imaging microscopy (OIM) aided in determining microstructural situations favorable for initiation of fatigue cracks. Finite element models were refined to predict elastic and plastic behavior of fully lamellar microstructures under static loading. An effective ligament model that successfully correlated crack growth ... |
|
| Evaluation of PMB Particulate Testing |
NOV 2000 |
26 pages |
| Authors:
David W. Barrington; DAYTON UNIV OH RESEARCH INST
|
| Researchers at the University of Dayton Research Institute (UDRI), acting on behalf of the Air Force Coating Technology Integration Office (CTIO), were asked to investigate several technical issues which had been reported regarding the specification for plastic media for the depainting of aircraft, MlL-P-85891A. The technical issues included the method for specific gravity determination, a reported incompatibility of the reagents called for in testing for heavy and light particulates, and ... |
|
| Composite Materials for Advanced Global Mobility Concepts |
OCT 2000 |
62 pages |
| Authors:
K. K. Han; DAYTON UNIV OH RESEARCH INST
|
| A 3-D stress and strain model of woven fabric composites based on Reissner's variational principle was developed and the model included 29 unknown variables. Strength predictions were also included, obtained by introducing penalty energy terms. The model results show good agreement when compared with woven composite experiments and flat laminate experiments and models. This agreement includes moduli, strength, and failure modes. Similar 3-D modeling of graphitic foam structures was initiated ... |
|
| Diesel Engine Cold Start Improvement Using THermal Management Techniques |
OCT 2000 |
146 pages |
| Authors:
Scott D. Stouffer; Arthur B. Lewis; Thomas J. Whitney; Michael L. Drake; DAYTON UNIV OH RESEARCH INST
|
| The objective of the research program was to investigate, develop, and demonstrate thermal energy storage systems for the improvement of the starting characteristics of Army Diesel engines exposed to cold temperatures overnight. Because of the effect of the oil temperatures on starting work, a passive thermal protection system that used Phase Change Materials (PCM) and insulation was designed for the oil pan and filter. Waste ... |
|
| Development of New High Temperature and High Performance Permanent Magnet Materials |
SEP 2000 |
94 pages |
| Authors:
S. Liu; G. E. Kuhl; DAYTON UNIV OH RESEARCH INST
|
| Permanent magnet materials capable of operating at high temperatures (equal or greater than 400 deg C) are required for advanced aerospace power systems. Prior to the UDRI AMPS team's successful program, the best available high temperature permanent magnets could not operate above 300 deg C. The problem for higher temperature operation has been that the strength of conventional magnets, as characterized by their intrinsic coercivity ... |
|
| Life Prediction Methodologies for Aerospace Materials |
AUG 2000 |
166 pages |
| Authors:
N. E. Ashbaugh; D. J. Buchanan; A. L. Hutson; R. John; K. Li; DAYTON UNIV OH RESEARCH INST
|
| The effect of microstructure, environment, and coatings on mechanisms of fatigue and fatigue crack initiation and growth in TiAl intermetallic alloys has been investigated. For a gamma titanium aluminide alloy, the coarse and refined lamellar materials with colony sizes equal to 700 and 280 m, respectively, have substantially greater crack growth resistance than does the fine duplex material with approximately 20 m grain size. The influence of laboratory air on ... |
|
| Comparisons of 325 Degrees F Temperature Flowing Fuel Line Couplings "O" Ring Application Fuel Leakage Test Results to Physical Property Test Results (CD-ROM) |
MAY 2000 |
|
| Authors:
Dexter Kalt; Susan Saliba; Alan Fletcher; Marlin Vangsness; John Dues; DAYTON UNIV OH RESEARCH INST
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| ELECTRONIC FILE CHARACTERISTICS: 1 Adobe PDF file : ill. PHYSICAL DESCRIPTION: 1 computer laser optical disc (CD-ROM); 4 3/4 in.; 16.1MB. SYSTEMS DETAIL NOTE: Requires CD-ROM drive and Adobe Acroabat Reader. ABSTRACT: This report describes the test results of JP-8 fuel aging at 325 deg F temperature of various "O" ring materials (fluorosilicone/fluorocarbon) as found in U.S. Air Force aircraft fuel line couplings (both fixed and variable cavity types). The ... |
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| Intrinsically Survivable Structural Composite Materials |
APR 2000 |
28 pages |
| Authors:
D. P. Anderson; B. P. Rice; DAYTON UNIV OH RESEARCH INST
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| Spherical nanoscale particles were incorporated into an aerospace epoxy resin. When properly dispersed with a combination of mechanical and ultrasonic mixing, the fracture toughness could be made twice that of the control resin. Spherical nanoparticles were added as a suspension which tended to agglomerate, dry fumed powders which were easiest to disperse and were formed in situ from silanes. The spherical particles had little effect on the flexural properties of ... |
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| Spline Variational Theory for Composite Bolted Joints |
APR 2000 |
45 pages |
| Authors:
E. V. Iarve; R. Y. Kim; DAYTON UNIV OH RESEARCH INST
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| Three dimensional failure initiation and progression modeling and the experimental work required to verify the analysis methods were conducted. verify the analysis methods were conducted. Damage initiation and progression in the unidirectional and quasi-isotropic laminates was modeled based on the property degradation methodology. Reissner-Hellinger variational principle was applied to rigorously represent the degraded material properties in order to model the discrete damage at the hole edge. A recursive algorithm based ... |
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