| Nondestructive Evaluation of Grain Size Distributions Using Multifractal Analysis of Backscattered Ultrasonic Signals |
10 DEC 92 |
47 pages |
| Authors:
N. Bilgutay; B. Onaral; D. Nicoletti; DREXEL UNIV PHILADELPHIA PA DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
 | Grain size is one of the factors which influence mechanical properties of metals like strength and fracture toughness. Ultrasonic waves propagating in polycrystalline materials are subject to attenuation dominated by grain boundary scattering. The importance of grain size estimation for industrial applications warrants the investigation of alternative methods of nondestructive grain size determination. Analysis of the power-law behavior of ultrasonic attenuation experimental data is used to link the wavelength dependence ... |
|
| Cyclic Load Testing of Unreinforced Masonry Walls |
DEC 92 |
50 pages |
| Authors:
Daniel P. Abrams; Nirav Shah; ILLINOIS UNIV AT URBANA ADVANCED CONSTRUCTION TECHNOLOGY CENTER
|
| The report presents results of three laboratory experiments done to investigate in-plane lateral strength and behavior of unreinforced masonry walls. The parameters of the experimental study were the length-to-height aspect ratio of the test walls and the level of vertical compressive stress. Wall specimens were newly constructed using reclaimed brick and a mortar representative of older construction. Measured strength and behavior of the test walls is correlated with each other, ... |
|
| Integrated Blade Inspection System (IBIS) Upgrade Study |
DEC 92 |
294 pages |
| Authors:
Tony J. DeLiberato; Steven W. Perkins; Steven K. Saplin; John G. Snyder; Gregory J. Toussaint; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| The purpose of this design study was to identify ways to improve the Integrated Blade Inspection System. The Air Force requires inspection of jet engine compressor and turbine blades to locate defects and prevent engine failure. The current inspection process uses fluorescent penetrant as an aid to identify cracked blades. A systems engineering design process was applied to evaluate the current inspection techniques and to develop alternative methods to satisfy ... |
|
| U.S. Army Advanced Construction Technology Fellowship Program. Final Report to the Army Research Office |
16 NOV 92 |
12 pages |
| Authors:
Joseph P. Murtha; ILLINOIS UNIV AT URBANA DEPT OF CIVIL ENGINEERING
|
| This is a report of the Fellowship Program conducted by the University of Illinois Advanced Construction Technology Center. The program was in effect from October 1, 1986 to September 30, 1992. During that time, thirty- five American graduate students were appointed to the program and designated U. S. Army Advanced Construction Technology Fellows. These fellows participated in the Research Program of the Center, while completing their graduate studies.... Graduate Fellowships, ... |
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| Damage Evaluation of Structures Using Frequencies and Mode Shapes Extracted from Laser Interferometry |
NOV 92 |
12 pages |
| Authors:
Roberto A. Osegueda; TEXAS UNIV AT EL PASO
|
| Non destructive damage evaluation theories to detect, locate and quantify damage in structures from vibrational characteristic measurements are summarized. Modal analysis experiments were conducted on cantilever beams and suspended plates using a laser interferometer vibration pattern imager. Resonant frequencies and mode shapes measured before and after damage were used to assess the inflicted damage. Three theories of damage detection were tested with the experimental measurements. It was found that the ... |
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| Some Recent Results on Stresses in Thin Films and Precipitates |
OCT 92 |
20 pages |
| Authors:
J. B. Cohen; NORTHWESTERN UNIV EVANSTON IL DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| Diffraction remains the premier tool for sampling the residual stresses in materials non destructively, the only one capable of determining the entire stress tensor, and with few assumptions. The technique has kept pace with the needs of researchers in the area of multiphase materials; now, the stresses can be separated into macro and micro components. The deviatoric macro and micro stress components and hydrostatic macrostress can be measured without knowledge ... |
|
| Advanced Construction Technology Research Equipment |
22 SEP 92 |
13 pages |
| Authors:
Joseph P. Murtha; ILLINOIS UNIV AT URBANA DEPT OF CIVIL ENGINEERING
|
| This report describes the research equipment purchased under the terms of a grant from the U.S. Army Research Office. The grant was part of the Department of Defence - University Research Initiative Program. Research Equipment. The Center's research program is organized into the following five thrust areas: (1) Nondestructive Evaluation Technologies for Constructed Works; (2) Construction Site Metrology; (3) Computer Aided Construction; (4) New Technologies and Materials for Building Construction; ... |
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| Ultrasonic Inspection of Filament Wound Graphite Epoxy Cylinders |
SEP 92 |
30 pages |
| Authors:
Lisa A. Tardiff; Bradley M. Taher III; ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB
|
| A nondestructive inspection procedure utilizing ultrasonic C-scan imaging was developed to test cylindrical filament wound graphite epoxy rocket motor cases. These cylinders are part of a joint U.S. Army, Navy, NASA, and Air force (JANNAF) research round robin to evaluate destructive testing techniques for this PM of composite. The rocket motor cases are made from T650/42 graphite fibers (Amoco) in a Lincoln Resin Formulation (LRF) and have six layers (twelve ... |
|
| The DARPA High-Performance Polymer Program. Volume 1. Program Background and Highlights of the Program Review Held on 14-15 January 1992 |
SEP 92 |
|
| Authors:
David R. Squire; George Mayer; INSTITUTE FOR DEFENSE ANALYSES ALEXANDRIA VA
|
 | In a series of projects dating back to 1984, the Defense Advanced Research Projects Agency (DARPA) has instigated research in advanced polymers including such goals as thermally oxidatively stable matrix resins for 700 F composite applications, rigid molecular composites, liquid crystal displays, and piezoelectric sensors. Volume I of the present report reviews the history and accomplishments of the DARPA High-Performance Polymer Program and presents highlights of the program review conducted ... |
|
| A Portable Sorption Tester for Nondestructive Testing of Chemical Protective Garments |
AUG 1992 |
36 pages |
| Authors:
Stephen Kerrin; Elizabeth Klemperer; TRACER TECHNOLOGIES SAN DIEGO CA
|
| A prototype portable instrument was developed to measure, nondestructively, sorptive capacity of chemical protective garments in the field. The instrument contains four major subsystems: flow control, detection, microprocessor controller, and sample cell. A low-boiling halocarbon mimics carbon tetrachloride, the standard test vapor. A very low flow mass flow controller mixes challenge from a pressurized cylinder with a controlled flow of air from a diaphragm pump. A double sample cell is ... |
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| Internal Structural Characterization |
AUG 92 |
128 pages |
| Authors:
R. Klaassen; M. Bashyam; GENERAL ELECTRIC CO CINCINNATI OH AIRCRAFT ENGINE TECHNICAL DIV
|
| The nondestructive evaluation (NDE) techniques most appropriate for the detection of a variety of defects in metal-and ceramic matrix composites (MMC and CMC's) are described. NDE techniques which were investigated for application to these materials include acoustic microscopy, ultrasonic pulse- echo, ultrasonic through-transmission, ultrasonic velocity, ultrasonic backscatter, ultrasonic surface wave velocity, ultrasonic surface wave attenuation, film radiography, microtomographic radiography, and dual-energy microtomographic radiography. Types of defects for which optimized techniques ... |
|
| Proceedings of the Government Neural Network Applications Workshop Held at Wright-Patterson AFB, Ohio on August 24-26, 1992. Volume 1 |
AUG 1992 |
130 pages |
| Authors:
Steve Suddarth; Steven K. Rogers; TACTICAL WEAPONS GUIDANCE AND CONTROL INFORMATION ANALYSIS CENTER CHICAGO IL
|
| This volume contains the proceedings of the Government Neural Networks Application Workshop held 24-26 August 1992 at the Hope Hotel, Wright- Patterson AFB, OH. The Tri-Service Neural Network working group organizes this meeting annually to highlight achievements in applying neural networks to government problems. Papers presented addressed the following applications: manufa |
|
| A Portable Sorption Tester for NOndestructive Testing of Chemical Protective Garments |
AUG 92 |
43 pages |
| Authors:
Stephen Kerrin; Elizabeth Klemperer; TRACER TECHNOLOGIES SAN DIEGO CA
|
| A prototype portable instrument was developed to measure, nondestructively, sorptive capacity of chemical protective garments in the field. The instrument contains four major subsystems: flow control, .detection, microprocessor controller, and sample cell. A low-boiling halocarbon mimics carbon tetrachloride, the standard test vapor. A very low flow mass flow controller mixes challenge from a pressurized cylinder with a controlled flow of air from a diaphragm pump. A double sample cell in ... |
|
| Laboratory and Field Testing of the M1 Lightweight Steel Tow Bar System |
AUG 92 |
32 pages |
| Authors:
Christopher Cavallaro; Robert B. Dooley; ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB
|
| In conjunction with the U.S. Army Tank-Automotive Command (TACOM), the U.S. Army Materials Technology Laboratory (MTL) has developed a lightweight steel tow bar system as an alternative to the current system used in the recovery of Ml Main Battle Tanks. The advantages of the new tow bar system are an increase in strength (by 30%), lighter weight (23% weight savings), and interchangeable legs. A series of instrumented laboratory and field ... |
|
| Spreadsheet-Like Image Analysis |
AUG 92 |
12 pages |
| Authors:
Paul Wilson; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY ARSENAL N J PRODUCT ASSURANCE DIRECTORATE
|
| This report describes the design of a new software system being built by the Army to support and augment automated nondestructive inspection (NDI) on- line equipment implemented by the Army for detection of defective manufactured items. The new system recalls and post-processes (off-line) the NDI data sets archived by the on-line equipment for the purpose of verifying the correctness of the inspection analysis paradigms, of developing better analysis paradigms and ... |
|
| A Boundary Integral Method for an Inverse Problem in Thermal Imaging |
AUG 92 |
30 pages |
| Authors:
Kurt Bryan; INSTITUTE FOR COMPUTER APPLICATIONS IN SCIENCE AND ENGINEERING HAMPTON VA
|
| This paper examines an inverse problem in thermal imaging, that of recovering a void in a material from its surface temperature response to external heating. Uniqueness and continuous dependence results for the inverse problem are demonstrated and a numerical method for its solution developed. This method is based on an optimization approach, coupled with a boundary integral equation formulation of the forward heat conduction problem. Some convergence results for the ... |
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| Ultrasonic Characterization of Highly Attenuative Thick Composites |
24 JUL 92 |
43 pages |
| Authors:
Narendra K. Batra; NAVAL RESEARCH LAB WASHINGTON DC
|
| Thick composites manufactured from various fiber and matrix materials are being increasingly used for structural components. Conventional ultrasonic methods cannot be used to characterize nondestructively these highly attenuative materials. In this report we define the term 'THICK' from a nondestructive evaluation (NDE) point of view which pertains to poor signal-to-noise (S/N) ratio of the received propagated signal in contrast to 'THICK' as referred to the load-bearing limit. Ultrasonic nondestructive evaluation ... |
|
| Unified Airport Pavement Design and Analysis Concepts Workshops Held in Cambridge, Massachusetts on 16-17 July 1991 |
JUL 92 |
579 pages |
| Authors:
FEDERAL AVIATION ADMINISTRATION WASHINGTON DC SYSTEMS RESEARCH AND DEVELOPMEN T SERVICE
|
| This publication outlines the proceedings of a workshop held in July 1991 at Cambridge, MA. The workshop provided a forum for leading pavement engineers, researchers and materials scientists to present concepts for the formulation of a unified mechanistic methodology for the analysis and design of pavements serving civil aircraft. The need developed from industry's requests for adequate methods to design, analyze and predict performance of pavements serving more demanding aircraft. ... |
|
| Proceedings of the USAF Structural Integrity Program Conference Held in San Antonio, Texas on 2-6 December 1991 |
JUL 92 |
787 pages |
| Authors:
Thomas D. Cooper; John W. Lincoln; WRIGHT LAB WRIGHT-PATTERSON AFB OH
|
| This report is a compilation of the papers presented at the 1991 USAF Structural Integrity Program Conference held at the Hyatt Regency, San Antonio, Texas on 2-6 December 1991. Airframe Structural Integrity Program, F-16N Fuel Shelf Joint Fatigue Life Extension, CT114 Tutor Wing, Composite Repair of Aircraft Structures, Compressive Strength in Composites. |
|
| In situ Material Characterization for Pavement Evaluation by the Spectral-Analysis-of-Surface-Waves (SASW) Method |
JUL 92 |
171 pages |
| Authors:
Don R. Alexander; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS GEOTECHNICAL LAB
|
| Spectral-analysis-of-surface-waves (SASW) is a method of nondestructive testing for material characterization of pavement systems. SASW is based on the theory of stress waves propagating in elastic media with the key elements being the generation and measurement of Rayleigh waves. From these measurements, shear wave velocity and modulus profiles can be obtained for multilayered elastic systems. SASW tests were conducted on six airfield pavement sites. Young's modulus profiles from SASW were ... |
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| Synthesis and Evaluation of Polymeric Materials |
30 JUN 92 |
258 pages |
| Authors:
E. Greenawald; J. Nagode; H. Hu; L. Levenberry; R. Newbegin; GEO-CENTERS INC NEWTON CENTRE MA
|
| GEO-CENTERS, INC. has been supporting the research efforts at the Naval Research Laboratory including novel fluoropolymers, conductive polymers, epoxies, and modified nylons. Major efforts were conducted in radiographic analysis development and use in evaluation of Sonar Rubber Domes (SRD) and Sonar Dome Rubber Windows (SDRW). This report is a summary of accomplishments for Year One of the contract period of performance. |
|
| Study of Residual Stresses and Microcracks in High Strength Steel Weldments; An Investigation of Microcrack Formation and Stressed Growth Using Laser Microscopy |
JUN 92 |
|
| Authors:
Stephen Edward Iwanowicz; MASSACHUSETTS INST OF TECH CAMBRIDGE
|
| The confocal scanning laser microscope (CSLM) allows viewing welds with a resolution to 0.25 microns. The image processor of the CSLM provides effectively infinite depth of field by superposing the in-focus parts of images. Slopes of more than 30 degrees do degrade the image, however. 4-point bend tests of bead-on-plate welds on 1 1 mm thick mild steel, HY-100, HSLA- 100, and HY-130 were performed to strains of 0 to ... |
|
| Current Nondestructive Inspection Methods For Aging Aircraft |
JUN 92 |
137 pages |
| Authors:
George Ansley; Stephen Bakanas; Maurice Castronuovo; Ted Grant; Frank Vichi; GALAXY SCIENTIFIC CORP MAYS LANDING NJ
|
| This report identifies and describes current methods used during the nondestructive inspection (NDI) of commercial transport aircraft for structural damage. The six most prevalent NDI methods identified are visual, eddy current, radiography, ultrasonic, penetrant, and magnetic particle. The physical principles, generalized performance characteristics, and typical applications associated with each method are described. In addition, descriptions of specific airframe and engine inspection practices are also presented. |
|
| X-Ray Computed Tomography for Whole System Evaluation (Small Engines) |
31 MAY 92 |
52 pages |
| Authors:
Alan R. Crews; Richard H. Bossi; BOEING DEFENSE AND SPACE GROUP SEATTLE WA
|
| Under a preliminary testing task assignment of the Advanced Development of X-Ray Computed Tomography Application program, computed tomography (CT) has been studied for its potential as an engineering analysis tool and an in-service nondestructive evaluation method for whole systems such as small jet engines. CT evaluation has been employed on small jet engines demonstrating its viability for assembly verification, dimensional profiles, and foreign object detection without disassembly. CT systems with ... |
|
| Instrument Driver for General Purpose Interface Bus (IEEE-488) |
MAY 92 |
53 pages |
| Authors:
Bradley M. Taber III; Patrick J. Sincebaugh; ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB
|
| Laboratory automation is invaluable to scientists, engineers, and technicians. It provides a mechanism by which many processes can be interactively controlled. A popular method of connecting and controlling laboratory instrumentation is through the General Purpose Interface Bus (GPIB). The Institute of Electrical and Electronics Engineers (IEEE) standardized this bus under IEEE-488. The objective of this project was to study the IEEE-488 and write instrument drivers in C++ for the GPIB ... |
|
| Performance of Insulated Pavements at Newton Field, Jackman, Maine |
MAY 92 |
30 pages |
| Authors:
Maureen A. Kestler; Richard L. Berg; COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
|
| In 1986, the runway at Newton Field, a small airport in Jackman, Maine, was reconstructed using a 2-in.-thick layer of extruded polystyrene insulation as part of the pavement structure. At the same time, a nearby town road was reconstructed using a conventional noninsulated pavement cross section for relatively heavy loads. Both pavements were monitored for frost penetration, frost heave, and seasonal changes in pavement strength. Since frost penetration beneath the ... |
|
| Nuclear Magnetic Resonance Spectroscopy |
23 APR 92 |
28 pages |
| Authors:
James F. Haw; TEXAS A AND M UNIV COLLEGE STATION DEPT OF CHEMISTRY
|
|
| A Heat Pipe Coupled Planar Thermionic Converter: Performance Characterization, Nondestructive Testing, and Evaluation |
15 MAR 92 |
121 pages |
| Authors:
Timothy J. Young; Thomas R. Lamp; Bang-Hung Tsao; Mysore L. Ramalingam; WRIGHT LAB WRIGHT-PATTERSON AFB OH
|
| This report provides the technical details on the research activities conducted by Wright Laboratory and UES, Inc. personnel during the period of August 1990 to November 1991. The performance of two heat pipe coupled, planar thermionic energy converters was characterized using experimental and analytical methods. Nondestructive failure analysis was performed to evaluate the causes for the failure of a molybdenum-rhenium converter. The experimentation was carded out at the thermionic facilities ... |
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| Instabilities of Damage and Surface Degradation Mechanisms in Brittle Material Structural Systems |
15 MAR 92 |
313 pages |
| Authors:
F. F. Tang; G. N. Frantziskonis; C. S. Desai; ARIZONA UNIV TUCSON ENGINEERING EXPERIMENT STATION
|
| A review of the theoretical and experimental information on surface degradation and related instabilities is presented, and the physical significance of surface or skin effects is identified. The research involves study of relation between surface degradation and scale or size as well as shape effects, and surface damage growth instabilities and related bursting in brittle materials. A theory is developed to trace growth of surface degradation and to- identify onset ... |
|
| Proceedings of the Second International Congress on Recent Developments in Air- and Structure-Borne Sound and Vibration (2nd) Held in Auburn University, Alabama on 4-6 March 1992. Volume 2 |
06 MAR 92 |
491 pages |
| Authors:
Malcolm J. Crocker; P. K. Raju; AUBURN UNIV AL DEPT OF MECHANICAL ENGINEERING
|
| Topics covered in the Proceedings include Sound Intensity, Structural Intensity, Modal Analysis and Synthesis, Statistical Energy Analysis and Energy Methods, Passive and Active Damping, Boundary Element Methods, Diagnostics and Condition Monitoring, Material Characterization and Non-Destructive Evaluation, Active Noise and Vibration Control, Sound Radiation and Scattering, and Finite Element Analysis. In the last 30 years, improvements in computers have allowed rapid developments in both theoretical and experimental analysis of acoustics and ... |
|
| Proceedings of the Second International Congress on Recent Developments in Air- and Structure-Borne Sound and Vibration (2nd) Held in Auburn University, Alabama on 4-6 March 1992. Volume 3 |
06 MAR 92 |
650 pages |
| Authors:
Malcolm J. Crocker; P. K. Raju; AUBURN UNIV AL DEPT OF MECHANICAL ENGINEERING
|
| Topics covered in the Proceedings include Sound Intensity, Structural Intensity, Modal Analysis and Synthesis, Statistical Energy Analysis and Energy Methods, Passive and Active Damping, Boundary Element Methods, Diagnostics and Condition Monitoring, Material Characterization and Non-Destructive Evaluation, Active Noise and Vibration Control, Sound Radiation and Scattering, and Finite Element Analysis. There are also six keynote papers on Aeroacoustics and Atmospheric Sound, Vibro-Acoustic Reciprocity, Underwater Acoustic Scattering, Acoustical Technology for Non-Destructive Evaluation, ... |
|
| Proceedings of the Second International Congress on Recent Developments in Air- and Structure-Borne Sound and Vibration (2nd) Held in Auburn University, Alabama on 4-6 March 1992. Volume 1 |
06 MAR 92 |
629 pages |
| Authors:
Malcolm J. Crocker; P. K. Raju; AUBURN UNIV AL DEPT OF MECHANICAL ENGINEERING
|
| This three-volume book of proceedings includes the written versions of the papers presented at the Second International Congress on Recent Developments in Air- and Structure-Borne Sound and Vibration held at Auburn University, March 4-6, 1992. Topics covered in the Proceedings include Sound Intensity, Structural Intensity, Modal Analysis, and Synthesis, Statistical Energy Analysis and Energy Methods, Passive and Active Damping, Boundary Element Methods, Diagnostics and Condition Monitoring, Material Characterization and Non-Destructive ... |
|
| Micromechanics of Defects |
MAR 92 |
4 pages |
| Authors:
T. Mura; NORTHWESTERN UNIV EVANSTON IL
|
| This report contains a brief outline of research findings and a list of publications and technical reports related to micromechanics of defects, nondestructive testing and cracking in fiber reinforced composites. |
|
| Ultrasound NDE of Adhesive Bond Integrity: A Quantitative Measure |
28 FEB 92 |
84 pages |
| Authors:
Rheinhold Ludwig; John M. Sullivan; WORCESTER POLYTECHNIC INST MA
|
| The objective of this research was to investigate and develop a coupled approach (analytical, numerical and experimental) to the ultrasonic nondestructive evaluation of adhesive bond integrity. Results of these studies were directed toward nondestructive evaluation (NDE) of the integrity of adhesive bonds and bondlines for advanced composites and multi-layered materials by the U.S. Army. Such studies are needed in both the manufacturing phases of products in order to assure quality ... |
|
| Surface Residual Stress Analysis of Metals and Alloys |
04 FEB 92 |
31 pages |
| Authors:
Teodoro Leon-Salamanca; Eugene R. Reinhart; REINHART AND ASSOCIATES AUSTIN TX
|
| The critically refracted longitudinal wave (CRLW) technique was used to establish how feasible it is to measure stress changes at the surface and interior of a material, in particular naval airframe metals such as Ti-6AI-4V, 6061-T651 Aluminum, and 4340 steel. The CRLW propagation characteristics were found to be potentially practical if use of the 2P wave is implementable to have it as a reference wave. The CRLW technique was effective ... |
|
| Composite Failure Analysis Handbook. Volume 2. Technical Handbook. Part 3. Case Histories |
FEB 92 |
129 pages |
| Authors:
R. J. Kar; NORTHROP CORP HAWTHORNE CA AIRCRAFT DIV
|
| The objective of this program was to create a comprehensive handbook for use in conducting failure analysis investigations on failed composite structure. This program builds upon previous efforts as documented in the Compendium of Post-Failure Analysis Techniques for Composite Materials, AFWAL- TR-86-4137. The purpose of creating this handbook was to document the techniques, the fractographic and material property data and case history studies currently being utilized in the analysis of ... |
|
| High Performance YBCO Films |
31 JAN 92 |
18 pages |
| Authors:
Edgar J. Denlinger; DAVID SARNOFF RESEARCH CENTER PRINCETON NJ
|
| The following progress report describes HTS sample characterization techniques that have been developed during this period for both the high microwave frequency range and for low frequencies below 1 GHz. For the microwave range, the resonator configuration consists of a cylindrical dielectric resonator probe in direct contact with an HTS sample and surrounded by a cylindrical metal (non-HTS) shield. The technique will be used for rhe nondestructive testing of HTS ... |
|
| Center for Composites Manufacturing Science, Reliability, and Maintainability Technology |
30 JAN 92 |
|
| Authors:
Tsu-Wei Chou; Roy L. McCullough; DELAWARE UNIV NEWARK CENTER FOR COMPOSITE MATERIALS
|
| The ARO/URI Center of Excellence was established to address the fundamental issues involved in the manufacturing science, reliability, and maintainability of composite structures for future Army systems. The program strongly emphasized building in quality, long life, predictable and reliable performance, durability, and lower life-cycle costs, with a minimum reliance on repair or rejection of poor quality after manufacturing. Research was initially conducted in the following areas: (1) Cure characterization and ... |
|
| Development of Technology for Modernizing Depot Handling of Fasteners |
28 JAN 92 |
53 pages |
| Authors:
Luis C. Cattani; Paul J. Eagle; DETROIT MERCY UNIV MI DEPT OF MECHANICAL ENGINEERING
|
| This report the results of research conducted for the Defense Logistics Agency (DLA) in the development of a technology for modernizing depot handling of fasteners. The proposed technology would aid in performing a limited technical inspection of the geometric and metallurgical qualities of fasteners as they are received from manufacturers of distributions. The technology would validate received material (providing technical data to assure that the received material corresponds to the ... |
|
| Survey of Research into Electromagnetic and Other Wave Effects on Mechanical Behavior and Processing of Materials |
JAN 92 |
|
| Authors:
George Mayer; Benjamin Tao; INSTITUTE FOR DEFENSE ANALYSES ALEXANDRIA VA
|
| In an effort to assess trends in the general areas of energy effects on materials, a survey was conducted for the period 1960-1990 of the open literature sources with special focus on electromagnetic and other wave phenomena. This survey has not treated nuclear, laser, or photoplastic effects. The statistics and trends in activity have been examined in four main areas: electric fields and currents, ultrasonics, microwaves, and magnetic fields. These ... |
|
| Effect of Interstitials on the Trapping of Hydrogen in Iron-Single Crystals |
92 |
41 pages |
| Authors:
James T. Waber; MICHIGAN TECHNOLOGICAL UNIV HOUGHTON DEPT OF PHYSICS
|
| A non destructive method of determining the densities of edge and screw dislocations was developed. Using it, thermal elimination of dislocation was shown to be a binary and two stage process for both cold rolled and metallographically polished specimens. The process involves the glide of dislocation dipoles rather than vacancy migration and climb. A method of extracting kinetic information from isochronal runs was developed and tested with isothermal runs. The ... |
|
| Damage Detection in Concrete Elements with Surface Wave Measurements |
92 |
207 pages |
| Authors:
Britt R. Bowen; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| The objective of this research was to assess the ability of surface wave measurements and the SASW technique to detect crack damage in beam and column elements. The damage was detected by a change in the surface wave dispersion curve (phase velocity vs frequency) between undamaged and damaged states. To calculate the dispersion curve, the SASW (Spectral Analysis of Surface Waves) technique was used with response records from two locations. ... |
|
| Real-Time NDE Using Multi-Function Robotic Sonoscope (MSRF) |
31 DEC 91 |
99 pages |
| Authors:
SONOSCAN INC BENSENVILLE IL
|
| During the Phase I, project management has been set to establish a sound basis for scheduling, controlling and modifying the project. In this section we present a simplified Project WBS (Work Breakdown Structure) and a Gantt chart, showing the proposed and then completed activities and tasks in the Phase I. The project has been broken down to eight main activities, according to the Technical Objectives presented in the Phase I ... |
|
| Thermal Wave Imaging nd Characterization of Solids |
31 DEC 91 |
33 pages |
| Authors:
R. L. Thomas; P. K. Kuo; L. D. Favro; WAYNE STATE UNIV DETROIT MI INST FOR MANUFACTURING RESEARCH
|
| Accomplishments are reported of a program of research to develop several thermal wave techniques and to explore applications of those techniques to the imaging of sub-surface features and the characterization of a variety of materials. Both experimental and theoretical studies were carried out, and the experiments included both cw and pulsed thermal wave excitation. The mirage effect (optical probe beam) technique was used to determine thermal diffusivities in a variety ... |
|
| Nondestructive Evaluation of a Graphite Aluminum Composite Space Radiator Panel |
DEC 91 |
54 pages |
| Authors:
Neil M. Feldman; John V. Foltz; NAVAL SURFACE WARFARE CENTER SILVER SPRING MD
|
| Graphite aluminum composites which employ graphite fibers for mechanical reinforcement have applications in the aerospace industry. They are particularly attractive for spacecraft thermal management systems due to their ability to efficiently transport heat. The detection and evaluation of damage in structures fabricated from this material is necessary to the efficiency and application of these materials. This technical report presents research on a graphite fiber reinforced aluminum composite space radiator panel. ... |
|
| AGARD/SMP Review Damage Tolerance for Engine Structures. 4. Reliability and Quality Assurance (Revue AGARD/SMP Tolerance Aux Dommages pour les Composants de Moteurs. 4 Fiabilite et Assurance Qualite) |
DEC 91 |
|
| Authors:
ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (FRAN CE)
|
| The Structures and Materials Panel has organized a series of four Workshops planned within the framework of a Review on Damage Tolerance for Engine Structures. The Review aimed to address the areas critical to the acceptance of an approach based on damage tolerance concepts as n alternative lifeing philosophy to that of safe life for the design of engine components. This publication is the last in the series on the ... |
|
| A Probabilistic Procedure for Aircraft Fleet Management, |
DEC 1991 |
|
| Authors:
Y. Theriault; A. R. Colle; BOMBARDIER INC/CANADAIR LTD MIRABEL (QUEBEC) MILITARY AIRCRAFT DIV
|
| A procedure for determining the probability of structural failure of an airplane at any stage of the operational life is described. This procedure is based on existing models for representing the size distribution of pile-service cracks, the distribution of the maximum service load expected in a single flight and the reliability of the nondestructive method used for inspection. A case study is presented to show how the procedure can help ... |
|
| Durability and Damage Tolerance Testing and Fatigue Life Management: ACF-18 Experience, |
DEC 1991 |
|
| Authors:
Major M. B. Zgela; Major W. B. Madley; DEPARTMENT OF NATIONAL DEFENCE OTTAWA (ONTARIO) DIRECTORATE OF AEROSPACE SUP PORT ENGINEERING
|
| The CF-18 multi-role fighter entered service in the Canadian Forces (CF) in 1982. Since then, 138 of these aircraft have been delivered and are operating out of seven squadron located in Canada and in Europe. Each aircraft is equipped with a multi-channel data acquisition system which records a number of parameters including measured strains, engine data, and various flight incident data. The analysis of this recorded data has enabled the ... |
|
| Determining the Intrinsic Permeability of Frazil Ice. Part 1. Laboratory Investigations |
DEC 91 |
19 pages |
| Authors:
Kathleen D. White; COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
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| Frazil ice causes problems in many northern rivers. Frazil ice deposits can block intakes and hinder navigation and can result in ice jam flooding. Knowledge of the characteristics of a frazil ice deposit can aid in the design of ice control methods for that particular site. Unlike sheet ice, many of the physical characteristics of frazil ice deposits are not well known. Among these are hydraulic conductivity, intrinsic permeability and ... |
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| Tornado Structural Fatigue Life Assessment, |
DEC 1991 |
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| Authors:
Paul Fraas; Ambrose Gollner; INDUSTRIEANLAGEN-BETRIEBSGESELLSCHAFT M B H OTTOBRUNN (GERMANY F R)
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| The structural development and the fatigue verification of the TORNADO programme has been completed. The majority of the aircraft have been delivered to the German Air Force and some of them have been in full operational use for a period of one -decade. This is considered a suitable time to review the approach for ensuring the long-term structural airworthiness, from the users point of view. |
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NONDESTRUCTIVE TESTING
