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Articles 2551 - 2580 of 2680

Full-Text Articles in Engineering Science and Materials

Usaf Nde Program - Requirements For Technology Transition, D M. Forney Jr Jan 1977

Usaf Nde Program - Requirements For Technology Transition, D M. Forney Jr

Review of Progress in Quantitative Nondestructive Evaluation

The final session of our meeting is intended to be a change of pace with the express purpose of better focusing on the realistic aspects of the application of NDE in the field; practical problems and limitations, the requirements, potential and opportunities. Actually, Gerry Posakony did a good job of kicking off this end of the meeting subject last night with a discussion of his problem with the rather complex looking structures for which he has to develop operational inspection techniques.


Criteria For Nondestructive Testing R&D, C S. Smith Jan 1977

Criteria For Nondestructive Testing R&D, C S. Smith

Review of Progress in Quantitative Nondestructive Evaluation

Gentlemen, I'm probably more out of place than any of your other speakers. Some have noted that they're chemists; some have noted that they're metallurgists. I have no research results to report; I'm a bureaucrat, one of those hopefully nice, gray, faceless, beings from the Pentagon. I must ask your forebearance this morning if I seem.a bit obtuse; where I work a square corner has 108 degrees. Unfortunately, listening to your meeting I quickly concluded that my initial topic for this talk was unsuitable for this occasion. What follows is a different talk. My apologies ...


Nondestructive Evaluation Uncertainty And Inspection Optimization, Duane P. Johnson Jan 1977

Nondestructive Evaluation Uncertainty And Inspection Optimization, Duane P. Johnson

Review of Progress in Quantitative Nondestructive Evaluation

NDE decisions differ from most other engineering decisions in that the NDE response or responses used in making a decision with regard to the serviceability of a part are often only weakly correlated with the serviceability of the part. The impact of of this weak correlation or inspection uncertainty on inspection errors and the effectiveness of the inspection is discussed. A quantitative methodology for selecting the optimum NDI accept/reject decision thresholds in the face of the inspection uncertainty is outlined. Also discussed briefly is how inspection uncertainty analysis can be used to estimate the inspection reliability from field or ...


Optimization And Application Of Electrodynamic Acoustic Wave Transducers, B W. Maxfield Jan 1977

Optimization And Application Of Electrodynamic Acoustic Wave Transducers, B W. Maxfield

Review of Progress in Quantitative Nondestructive Evaluation

I'm going to talk about the use of electromagnetic acoustic wave transducers, or EMATS as I call them, as they are being used for bulk wave generation. They have been applied specifically to the problem of measuring the intensity distribution of acoustic waves that are scattered by defects of known geometries. Related studies have been done elsewhere for some time and have formed an integral part of this general program.


Trapped Acoustic Modes For Adhesive Strength Determination, George A. Alers Jan 1977

Trapped Acoustic Modes For Adhesive Strength Determination, George A. Alers

Review of Progress in Quantitative Nondestructive Evaluation

The most important aspect of measuring the strength of adhesion at an adhesive to metal interface is to understand the chemistry of the interface and to know what makes a good interface. The existence of a strong interface will make the joint less susceptible to fabrication defects that are going to be there no matter how carefully the joint is prepared.


Experiences Of Ndt Technology Transfer At Harwell, R S. Sharpe Jan 1977

Experiences Of Ndt Technology Transfer At Harwell, R S. Sharpe

Review of Progress in Quantitative Nondestructive Evaluation

I very much appreciate the opportunity of being able to come over to this meeting. I was a bit surprised when Don Thompson phoned me up and said, "Come and talk about technology transfer to a meeting on quantitative NDT," but having sat attentively during the past day and a half here, I think I can now appreciate the need for urgent discussion and debate on the subject. Now, when you are scheduled to speak on the last day like this, you usually find that you have got to completely rewrite your talk the evening before to fit in with ...


Adaptive Deconvolution To Improve Resolution, E S. Furgason, V L. Newhouse Jan 1977

Adaptive Deconvolution To Improve Resolution, E S. Furgason, V L. Newhouse

Review of Progress in Quantitative Nondestructive Evaluation

Deconvolution applied to ultrasonic flaw detection offers the possibility of greatly improved resolution through the elimination of the transducer response. Seydel has previously demonstrated that at least a modest increase in resolution is possible provided the signal-to-noise ratio of the signal being deconvolved is large enough. The random signal flaw detection system can be shown to be ideally suited to deconvolution since it provides enormous signal-to-noise ratio enhancement. Furthermore, the bandwidth compression inherent in this system allows A-D conversion of the output at a rate several orders of magnitude lower than the transmitted ultrasonic frequency. The computer program created to ...


Nuclear Resonance For The Nondestructive Evaluation Of Structural Materials, G A. Matzkanin Jan 1977

Nuclear Resonance For The Nondestructive Evaluation Of Structural Materials, G A. Matzkanin

Review of Progress in Quantitative Nondestructive Evaluation

It is appropriate that this presentation is in a session on new techniques because the program I will discuss this afternoon is sufficiently new that few concrete results are available to report. The program I will discuss was recently funded at Southwest Research Institute by AFOSR and involves examining the possibility of developing nuclear resonance techniques for the nondestructive evaluation of structural materials. What I hope to do this afternoon is to fill you in a bit with regard to the background involved in this program and bring you up to date regarding our research plans. I will discuss some ...


Theoretical Elements Of Acoustic Emission Spectra, J A. Simmons, R B. Clough Jan 1977

Theoretical Elements Of Acoustic Emission Spectra, J A. Simmons, R B. Clough

Review of Progress in Quantitative Nondestructive Evaluation

I will be describing an acoustic emission program at the National Bureau of Standards sponsored jointly by NBS and the Electric Power Research Institute. This is part of a larger comprehensive NDE program at NBS. The acoustic emission program uses the spectral analysis approach for the characterization of moving defects and, as I will point out, includes the development of an acoustic emission transducer calibration facility as well as the experimental study of crack motion in glass and pressure vessel steels. These require a quantitative theory which serves to guide the experimental design as well as to interpret the results.


Near Real Time Ultrasonic Pulse Echo Holographic Imaging System, G J. Posakony Jan 1977

Near Real Time Ultrasonic Pulse Echo Holographic Imaging System, G J. Posakony

Review of Progress in Quantitative Nondestructive Evaluation

Nondestructive flaw characterization has keen research interests throughout industry. The nuclear industry is no exception. Identifying the size, shape, orientation, type and position of material flaws in nuclear reactor pressure vessels has a top priority. Under a contract with the Electric Power Research Institute of Palo Alto, California, Battelle-Northwest is developing a demonstration model of a sequentially pulsed phased linear array system for ultrasonic inspection of reactor vessels. This program employs the linear array in both pulse echo and holographic modes and provides near real time images of the weld zone volume. The objectives of the program are to develop ...


Cohesive Strength Prediction Of Adhesive Joints, P L. Flynn Jan 1977

Cohesive Strength Prediction Of Adhesive Joints, P L. Flynn

Review of Progress in Quantitative Nondestructive Evaluation

My part of this program was to investigate a nondestructive method for measuring the cohesive strength properties of adhesively bonded joints.

I started this problem by viewing a reasonably fundamental study in modeling the adhesive as a layer between two infinite aluminum adherends. You can set up wave potentials in these different regions in terms of reflected and transmitted waves, as is seen in Fig. 1. If you set up your wave number in a very classical manner, where everything is elastic and there is no damping, you just get a regular Rayleigh-type solution. If you desire to include the ...


Report On The Symposium On Nondestructive Testing Standards, G Birnbaum Jan 1977

Report On The Symposium On Nondestructive Testing Standards, G Birnbaum

Review of Progress in Quantitative Nondestructive Evaluation

A symposium on nondestructive testing (NDT) standards reflecting widespread current concern with this area was held at the National Bureau of Standards (NBS) May 19-21, 1976. The symposium was cosponsored by the National Bureau of Standards (NBS), the American Society for Testing and Materials (ASTM), the American Society for Nondestructive Testing (ASNT), with the American National Standards Institute (ANSI) cooperating. The meeting provided the first general forum encompassing discussions on the processes by which NDT codes, standards, and specifications become accepted, and discussions on the status and needs that exist in all NDT methods. Major themes included standards documents, the ...


Sagamore, Nde Topics, George Mayer Jan 1977

Sagamore, Nde Topics, George Mayer

Review of Progress in Quantitative Nondestructive Evaluation

The 23rd Sagamore Army Materials Research Conference was held last week in upstate New York. The theme was Nondestructive Characterization of Materials, and the intent of this meeting was to approach the subject with a broad brush treatment, including historical aspects, the assessment of significant advances in each topic area, important new capabilities, and discussion of some exploratory techniques as contrasted with the generally more focused and in-depth studies that have been reported here at Asilomar.


The Ndt Program At Stanford University, Gerry S. Kino Jan 1977

The Ndt Program At Stanford University, Gerry S. Kino

Review of Progress in Quantitative Nondestructive Evaluation

Some of the things that are going on at Stanford include my own, Shaw's, Auld's and Quate's work. In particular, one of the things that was mentioned this morning, which I think is very exciting, is Shaw's work on PVF2 plastic transducers. He is obtaining very broad bandwidths of the order of 10 MHz with absolutely flat responses. These are very impressive transducers, and I think they are going to be very important in the future.


Models For The Frequency Dependence Of Ultrasonic Scattering From Real Flaws, Laszlo Adler, Kent Lewis Jan 1977

Models For The Frequency Dependence Of Ultrasonic Scattering From Real Flaws, Laszlo Adler, Kent Lewis

Review of Progress in Quantitative Nondestructive Evaluation

My objective is to help develop a quantitative working model for a typical nondestructive testing system. Specifically, our objective is to relate the parameters which characterize a defect s~ch as size, orientation, and shape to the ultrasonic scattering field parameters such as amplitude, frequency, scattering angle, and polarization or mode conversion. In Fig. 1 is shown a flat surface sample immersed in liquid containing a real flaw a certain distance below the surface; i.e., in the bulk of the material. Sound waves propagate through the liquid and for the simplest case the wave front enters such that only ...


Acoustical Imaging And Holography Seventh International Symposium, D E. Yuhas Jan 1977

Acoustical Imaging And Holography Seventh International Symposium, D E. Yuhas

Review of Progress in Quantitative Nondestructive Evaluation

I am going to report briefly on the Acoustical Imaging and Holography Conference that was concluded yesterday in Chicago. These conferences were started in 1967, and are concerned primarily with ultrasonics and visualization techniques as applied to medicine, nondestructive evaluation, sonar, seismic analysis and acoustic microscopy.


Measurement Of Subsurface Fatigue Crack Size Using Nonlinear Adaptive Learning, A N. Mucciardi Jan 1977

Measurement Of Subsurface Fatigue Crack Size Using Nonlinear Adaptive Learning, A N. Mucciardi

Review of Progress in Quantitative Nondestructive Evaluation

I would like to present some ideas regarding the current stat us of fatigue crack NOE, where the field could go, and then give a case example of a recently synthesized NDE (software) system for detection and sizing aluminum fatigue cracks.


New Procedure For Calibrating Ultrasonic Systems For Quantitative Nde, Bernard R. Tittmann Jan 1977

New Procedure For Calibrating Ultrasonic Systems For Quantitative Nde, Bernard R. Tittmann

Review of Progress in Quantitative Nondestructive Evaluation

The presently used ultrasonic standard for calibrating ultrasonic systems is the "flat bottom hole." In view of some dissatisfaction by. many, we sought to apply the results of our scattering studies to explore the possibility of coming up with an alternative. This is a proposal for a new standard, and as I go through the discussion, please keep in mind that this work is still very much in its infancy.


Scattering Of Ultrasound By Ellipsoidal Cavities, Bernard R. Tittmann Jan 1977

Scattering Of Ultrasound By Ellipsoidal Cavities, Bernard R. Tittmann

Review of Progress in Quantitative Nondestructive Evaluation

Before I begin I would like to emphasize that the work reported here is the result of a team effort, and was carried out in close collaboration with Neil Paton of the Science Center in the sample fabrication, Ken Lakin of USC in the characterization of the transducers, Dick Cohen of the Science Center in the theoretical calculations from "exact theory," John Richardson and Dick Elsley of the Science Center in the Fourier analysis of the ultrasonic pulses and the synthesis of the calculations over the band width of the transducers. We thank Jim Krumhansl and his group at Cornell ...


Defect Characterization-Fundamental Flaw Classification Solution Potential, Joseph L. Rose, Bruce Eisenstein, John Fehlauer, Michael Avioli Jan 1977

Defect Characterization-Fundamental Flaw Classification Solution Potential, Joseph L. Rose, Bruce Eisenstein, John Fehlauer, Michael Avioli

Review of Progress in Quantitative Nondestructive Evaluation

Pattern recognition techniques are currently being applied to many signal interpretation problems in nondestructive testing. Simulearning technology combines various aspects of wave propagation analysis, pattern recognition philosophy, and signal processing theory in such a way as to outline procedures and establish guidelines for solving many problems in flaw classification. A portion of this paper will be used to present flaw classification problem statements and potential solution techniques along with simple data and analysis techniques.


Recent Advances In The Measurement Of Residual Stress By X-Ray Diffraction, M R. James Jan 1977

Recent Advances In The Measurement Of Residual Stress By X-Ray Diffraction, M R. James

Review of Progress in Quantitative Nondestructive Evaluation

I was asked to come here and give an educational overview talk on the recent work that has been done in the x-ray residual stress area and some of. the reasons why it is not always accepted as a val1d technique. The main problem that we have.to lo?k at is that when anyone measures macroscop1c resldual stresses, by whatever method - mechanical. techniques, x-ray techniques, ultrasonic technlquesone is always-measuring a different property of the material and trying to relate that to the macroscopic residual stress. There is no reason that residual stress must be the same for all these ...


Ultrasonic Flaw Detection In Ceramics, A G. Evans Jan 1977

Ultrasonic Flaw Detection In Ceramics, A G. Evans

Review of Progress in Quantitative Nondestructive Evaluation

The work I shall be describing this afternoon is a recently initiated joint study between Stanford University and the Science Center to determine the viability of ultrasonics as a failure prediction technique for structural ceramic materials.


Interpretation Of Ultrasonic Scattering Measurements By Various Flaws From Theoretical Studies, J A. Krumhansl, E Domany, P Musikar, S Teitel, D Wood Jan 1977

Interpretation Of Ultrasonic Scattering Measurements By Various Flaws From Theoretical Studies, J A. Krumhansl, E Domany, P Musikar, S Teitel, D Wood

Review of Progress in Quantitative Nondestructive Evaluation

Let me begin by saying that this is part of a program which is very much complementary to and is helped by the experimental program; so I'll repeat, in part, some of the overview comments that Bruce Thompson made this morning. We've regarded our role as one of trying to plug into the overall program those aspects of the theory of elastic wave scattering which can be developed in a utilitarian way in terms of modern analytical and computational techniques, in a form which I hope can be useful in signal processing, interpretation, design of experiment, etc. To ...


Acoustic Interactions With Internal Stresses In Metals, Otto Buck, R Bruce Thompson Jan 1977

Acoustic Interactions With Internal Stresses In Metals, Otto Buck, R Bruce Thompson

Review of Progress in Quantitative Nondestructive Evaluation

It became evident at the residual stress meeting in San Antonio last yearl that it is necessar2 to restate the definitions for internal stresses. In general, we are talking about three kinds of residual stresses as shown in Table I. The one that's called the first kind of internal stress ranges over millimeters or centimeters {or long range internal stress) and can be identified by x-rays through a line shift. The second kind ranges over dimensions of microns and with the x-ray method gives rise to a shift as well as a line broadening. This type is usually due ...


Discussion Of Factors Controlling Army Helicopter Reliability, K Rummel, T House Jan 1977

Discussion Of Factors Controlling Army Helicopter Reliability, K Rummel, T House

Review of Progress in Quantitative Nondestructive Evaluation

The Army's interest in significant aviation improvements actually started, or at least gained steam, in the 1960's during the extended combat we had in southeast Asia where a lot of problems in the utilization of the rotary wing aircraft came to a head, and I'll talk about those in more detail. What I would like to do is go through how the Army has responded to those problems that were revealed, through R&D and even more specifically in the diagnostics area. When I say diagnostics, what I'm talking about is the second category of NDI ...


Effect Of Compliant Wall Motion On Turbulent Boundary Layers, Dennis M. Bushness, Jerry N. Hefner, Robert L. Ash Jan 1977

Effect Of Compliant Wall Motion On Turbulent Boundary Layers, Dennis M. Bushness, Jerry N. Hefner, Robert L. Ash

Mechanical & Aerospace Engineering Faculty Publications

A critical analysis of available compliant wall data which indicated drag reduction under turbulent boundary layers is presented. Detailed structural dynamic calculations suggest that the surfaces responded in a resonant, rather than a compliant, manner. Alternate explanations are given for drag reductions observed in two classes of experiments: (1) flexible pipe flows and (2) water-backed membranes in air. Analysis indicates that the wall motion for the remaining data is typified by short wavelengths in agreement with the requirements of a possible compliant wall drag reduction mechanism recently suggested by Langley. Copyright © 1977 American Institute of Physics.


Creel Census And Fisheries Utilization Study, Dickey-Lincoln School Lakes Project, Maine : For The Period 26 May 1976 To 15 August 1976, Final Report To U.S. Army Corps Of Engineers, Gordon W. Russell, Richard W. Hatch, Mary J. Hosmer Jan 1976

Creel Census And Fisheries Utilization Study, Dickey-Lincoln School Lakes Project, Maine : For The Period 26 May 1976 To 15 August 1976, Final Report To U.S. Army Corps Of Engineers, Gordon W. Russell, Richard W. Hatch, Mary J. Hosmer

Dickey-Lincoln School Lakes Project

To describe the utilization of the existing fishery resource within the project area during the summer of 1976. Information collected between Memorial Day and August 15, 1976 is used to estimate angler use of the area, total catch and economic value of angler use and to profile the user group.


Diagnostic Aids For Military Systems, William Whelan Jul 1975

Diagnostic Aids For Military Systems, William Whelan

Proceedings of the ARPA/AFML Review of Quantitative NDE, June 1974–July 1975

I'm Bill Whelan from the Rand Corporation. I'd like to present a brief and somewhat general set of comments on diagnostic aid systems. The comrnents are general because I am summarizing previous and ongoing Rand study efforts.

As you may be aware, Rand has done considerable work for t he Air Force in several areas related to diagnostic aid systems, such as investigations of engine health monitoring systems and studies of aircraft maintenance policies and programs. Recently, Rand has undertaken, under ARPA sponsor ship, a project to assess the utility and cost-effectiveness of diagnostic aid systems for U ...


Ua64/3 Readout, Wku Industrial Education & Technology Apr 1975

Ua64/3 Readout, Wku Industrial Education & Technology

WKU Archives Records

Newsletter includes articles:

  • New Departmental Programs
  • Crisp, Jeff. Vocational-Industrial & Technical Teacher Education CBTE Project
  • Lyons, Jerry. Not a Dirty Word, re productivity
  • Conley, Frank. Comment, re: scholarships
  • Dye, Wandel. Airbrush Rendering
  • Student Chapter of SME Formed
  • New Equipment Inventory
  • Nalbach Demonstration Highlights Semester
  • Environmental Science & Technology Building
  • Industrial Technology Lecture Series


Progress In Extractive Metallurgy, Volume 1. Review By G.N. Dobrokhotov, Fathi Habashi Jan 1975

Progress In Extractive Metallurgy, Volume 1. Review By G.N. Dobrokhotov, Fathi Habashi

Fathi Habashi

Review of the first volume of Progress in Extractive Metallurgy edited by Fathi Habashi and published by Gordon & Breach in New York in 1975. The review was written by Professor Dobrokhotov at the Leningrad Mining Institute.