It\u27s a pleasure to welcome you to the ARPA/AFML Review of Progress in Quantitative NDE. I\u27m Don Thompson, Director of the Structural Materials Department at the Rockwell International Science Center, and have had the privilege of serving as the Program Manager for the Program in Quantitative NDE which is under discussion for the next three days here. I\u27d like to introduce Prof. Herbert H. Johnson, Director of the Materials Science Center at Cornell University. and our host for the next three days. Herb, I\u27m sure that Dr. Peter Cannon, Vice President of the Science Center, Mrs. Diane Harris, who has served as our conference coordinator, myself, and a 11 my colleagues join to thank you and your staff-- Mr. Noel Desch, Mrs. Sharon Wells, Ms . Kris Molt, and many others--for all the cooperation you have given us. Special mention should also be given to Prof. J. A. Krumhansl for taking the initiative in suggesting that this meeting be held at Cornell. We appreciate the many courtesies and hospitality that you at Cornell have shown us

Johnson, H. H.

Thompson, Donald O.

English

It's a pleasure to welcome you to the ARPA/AFML Review of Progress in Quantitative NDE. I'm Don Thompson, Director of the Structural Materials Department at the Rockwell International Science Center, and have had the privilege of serving as the Program Manager for the Program in Quantitative NDE which is under discussion for the next three days here. I'd like to introduce Prof. Herbert H. Johnson, Director of the Materials Science Center at Cornell University. and our host for the next three days. Herb, I'm sure that Dr. Peter Cannon, Vice President of the Science Center, Mrs. Diane Harris, who has served as our conference coordinator, myself, and a 11 my colleagues join to thank you and your staff-- Mr. Noel Desch, Mrs. Sharon Wells, Ms . Kris Molt, and many others--for all the cooperation you have given us. Special mention should also be given to Prof. J. A. Krumhansl for taking the initiative in suggesting that this meeting be held at Cornell. We appreciate the many courtesies and hospitality that you at Cornell have shown us.</p

Johnson, H.

Thompson, Donald

Digital Repository @ Iowa State University (ISU)

WELCOME AND INTRODUCTORY REMARKS H. H. Johnson Cornell University Ithaca, New York and D. 0. Thompson Science Center, Rockwell International Thousand Oaks. California 91360 D. 0. Thompson: It's a pleasure to wel come you to the ARPA/AFML Review of Progress in Quan-titative NDE. I'm Don Thompson, Director of the Structural Materials Department at the Rodwell International Science Center, and have had the privilege of serving as the Program Manager for the Program in Quantitative NDE which is under discussion for the next three days here. I'd like to introduce Prof. Herbert H. Johnson, Oinector of the Materials Science Center at Cornell University. and our host for the next three days. Herb, I'm sure that Dr. Peter Cannon, Vice President of the Science Center, Mrs. Diane Harris, who has served as our conference coordinator, myse 1 f, and a 11 my colleagues join to thank you and your staff--Hr. Noel Desch, Mrs. Sharon Wells, Ms . Kris Molt, and many others--for all the cooperation you have given us. Special mention should also be given to Prof. J. A. Krumhansl for taking the initiative in suggesting that this meeting be held at Cornell. We appreciate the many courtesies and hospitality that you at Cornell have shown us. H. H. Johnson : On behalf of the Mater ials Science Center and the University in genera l, we're very pleased that you've chosen to come here for your review meeting. For the last two or three years the Materials Science Center has been trying to encourage the holding on campus of major meetings in materials and materials related topics so that when Jim Krumhansl came and said, "Why not have the NOT meeting here?" it seemed to be a natural. Consequently, we plunged right in. We hope you enjoy your stay. In view of the fact that we're starting just a little bit late , I don't think I'll say any more just now. I hope you have a good meeting. D. 0. Thompson: Thank you very much, Herb. The good wi 11 and the courtesies that you have extended are much appreciated. Before proceeding with a progra~ summary, I 'd like to recognize two guests from overseas who are with us. They are Prof. Holler, Director of the NDE Institute at Saarbrucken, West Germany, and Mr. Robert Dokes of the British Navy Admiralty Materials Laboratory. We're glad that you could join us in this review. I'd like to take a few mi nu tes to tell you a little bit about the program. During it's three-year his tory, the ARPA/Ai r Force program has pursued four objectives. I think it's worth-while to take a brief look at them so one can better measure over the next three days where we are, what we have done, and where we h1ve come from over these last three yea1·s. The objectives are: • To pursue advanced research in selected areas • To establi s~ a focal point for NDE research • To enhance communication between the research community and the NDE user • To improve the scientific base for NDE in se 1 ected areas. The research referred to in the first objective has been divided into three projects. These pro-jects are: 1. Flaw characterization by acoustic techniques. 2. Bond strength of bonded materials. 3. NDE characterization of failure related material properties. Projects 2 and 3 have lately been combined under the heading of strength-related properties. Approximately two-thirds of our efforts have been spent in the ultrasonic topic, that is, the first one, and the remai ning one-third in projects two and three. I think that 1 number of exciting things have developed in these projects over the three years. Two related approaches have been pursued in Project 1 in an effort to develop a quantitative caoabi li ty. The first is an ultrasonic scattering approach which has involved the development of new samples suitable for scattering experiments, theoretical treatments of the scattering which are amenable both to ultrasonic system design and to the develo~nt of a physical "feeling" of the behavior of scattering, experimental veri-fication of these theories. and inversion pro-cedures for the deduction of quantitative results fr~~ ultrasonic signals. The second approach has emphasized acoustic imaging and a transferral of work from the medical imaging field into the material NDE area. Underlying these efforts (and a necessary adjunct to them) are a number of ultrasonic improvewents that also possess a stand-alone identity. These include a transducer charac-terization capabi li ty which provides a convenient method for the characterization of NDE transducers and two new options for inverse filtering to provide ways to improve transducer fidelity. The new technology of non-contact transducers has been siqnificantly advanced. As a result of the work done to date, a nUiber of applications are now in progress. Severil software packages have also  been produced which aid significantly in the improvement of ultrasonic responses. Two other important applications areas have been generated from the ultrasonic scattering work in this pro-ject. These are a candidate procedure for ultra-sonic standards and developments in the ultrasonic NDE of ceramic materials. As you recall, one of the program objectives is aimed at the improvement of the scientific base for NDE. As a physicist, I am particularly pleased with the closure that has been obtaine~ in the ultrasonic work. By closure is meant the cycle whereby well charac-terized scattering samples were designed and fabricated, ultrasonic scattering theories were developed to describe them, the theories were independently experiEntally verified, and the results then inverted to extract quantitative flaw parameters which agreed reasonably well with the known parameters. The successful develop-ment of this loop required other noteworthy advances, as indicated above, and, I believe, represents the first time in ultrasonic NDE that this traditional scientific loop has been closed. In Projects 2 and 3 we have several other successes. These include the development of NOE procedures for the characterization of strengths in simple (single-phise) adhesively bonded materia 1 s. Another ts a technique for the measurement for moisture in composites. Advances have also been made in the analysis of acoustic emission signals f~ which they can be correlated with the strength of the composite. Techniques for residual stress detection in ferrous materials utilizing the non-contact transducer technology is also ready for an application. I would like to say a few ~ords about the nature of the work in these projects that will be reported in the next three days. Our efforts have been aimed prinarily at the generic core that underlies and is common to many specific applications. We believe that this is the most cost-effective way to spend the major part of the research funds entrusted to us. Specific application problems can then be addressed utiliz-ing this knowledge. Finally, I'd like to make some comments about work that supports the last three objectives. As of January, 1977, the program had produced some 55 technical papers, and another eleven or twelve had been sub•itted to editors. Program participants had gi¥en 67 seminars and professional society papers, as of that time, and ten patent disclosures as of that time had been written. That number will probably be doubled when every-thing is caught up. There have also been some fifteen or more gra6uate students involved in our work, a very important element of bringing new thoughts into the NDE area. Two special journal issues have been produced, and a number of review papers are in preparation. One of the major points of the progr~ has been the annual meetings, like this one. They have grown from about 65 attendees at the first to about 200 at this one. We appreciate very ~ch the cooperation demon-strated by colleagues doing related research at these meetings and from users who need new tools. This cooperation has aided significantly in establishing a focal point for NDE research activities. Again, I welcome and thank you for coming to the meeting. I sincerely hope that you'll find it worthwhile, and that you will contribute freely to an exchange of ideas and information. 

Welcome and Introductory Remarks

Johnson, H

https://dr.lib.iastate.edu/handle/20.500.12876/15926

Welcome and Introductory Remarks

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Digital Repository @ Iowa State University (ISU)