Review of Progress in QUANTITATIVE NONDESTRUCTIVE EVALUATION Volume 12A A Continuation Order Plan is available for this series. A continuation order will bring delivery of each new volume immediately upon publication. Volumes are billed only upon actual shipment. For further information please contact the publisher. Review of Progress in QUANTITATIVE NONDESTRUCTIVE EVALUATION Volume 12A Edited by o. Donald Thompson Center for NDE Ames Laboratory (USDOE) and Department of Aerospace Engineering and Engineering Mechanics Iowa State University Ames, Iowa and Dale E. Chimenti Center for NDE and Department of Materials Science and Engineering The Johns Hopkins University Baltimore, Maryland PLENUM PRESS • NEW YORK AND LONDON The Library of Congress has cataloged earlier volumes of this title as follows: Library of Congress Cataloging in Publication Data Main entry under title: Review of progress in quantitative nondestructive evaluation. "Proceedings of the Eighth Air Force/Defense Advanced Research Projects Agency Symposium on Quantitative Nondestructive Evaluation, held August 2-7, 1981, at the University of Colorado, Boulder" - Vol. 1, verso t.p. "First half of the proceedings of the ninth review of progress in quantitative non destructive evaluation, held August 1-6, 1982, at the University of California, San Diego, California" - Vol. 2A, t.p. verso. "Proceedings of the Tenth Annual Review of Progress in Quantitative Nondestructive Evaluation, held August 7-12, 1983, atthe University of California, Santa Cruz, Califor nia"-Vol. 3, verso ClPt.p. Includes bibliographical references and index. 1. Nondestructive testing-Congresses. I. Thompson, Donald o. II. Chimenti, Dale E. III. United States. Air Force. IV. Air Force/Defense Advanced Research Projects Agency Symposium on Quantitative Nondestructive Evaluation (8th: 1981: University of Colo rado, Boulder) V. United States. Defense Advanced Research Projects Agency. TA417.2.R48 1982 620.1'127 82-9140 ISBN 0-306-44483-6 First half of the proceedings of the Nineteenth Annual Review of Progress in Quantitative Nondestructive Evaluation, held July 19-24, 1992, in La Jolla, California © 1993 Plenum Press, New York A Division of Plenum Publishing Corporation 233 Spring Street, New York, N.Y. 10013 All rights reserved No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, microfilming, recording, or otherwise, without written permission from the Publisher PREFACE These Proceedings, consisting of Parts A and B, contain the edited versions of most of the papers presented at the annual Review of Progress in Quantitative Nondestructive Evaluation held at the University of California San Diego, in La Jolla, California on July 19- July 24, 1992. The Review was organized by the Center for NDE at Iowa State University and the Ames Laboratory of the USDOE in cooperation with a number of organizations including the Air Force Wright Laboratory Materials Directorate, the American Society for Nondestructive Testing, the Center for NDE at Johns Hopkins University, the Department of Energy, the Federal Aviation Administration, the National Institute of Standards and Technology, the National Science Foundation IndustrylUniversity Cooperative Research Centers, and the Working Group in Quantitative NDE. This year's Review of Progress in QNDE was attended by approximately 475 participants from the U.S. and many foreign countries who presented over 380 papers. With such a large volume of work to review, the meeting was divided into 36 sessions with as many as four sessions running concurrently. The Review covered all phases of NDE research and development from fundamental investigations to engineering applications or inspection systems, and it included all methods of inspection science from acoustics to x-rays. During the last twenty years, the participants of the Review have contributed to its steady growth. Thanks to their efforts, the Review is today one of the largest and most significant gatherings of NDE researchers and engineers anywhere in the world. Drawing on experience and wishing to streamline the process, the Editors have once again structured with the Proceedings, and the Review itself, in formats as similar as the submitted papers would allow. The result of this consistent ordering has produced a logical organization for both the meeting and the present volume. The reader will find that the arrangement of papers into topical subject headings follows a plan now familiar to regular attendees of the Review, preserving the user-friendly nature of the document. Of course, some minor changes in the headings and their subcategories had to be introduced to accommodate the evolution of the field as we observe it. The contents contain subject areas which reflect the current activity in NDE; these areas are chosen to include within their scope all papers in the Proceedings. In the following paragraphs a brief summary of the research presented in each of these topical areas is offered. Focussing on the theme of technology transition, the 1992 keynote address by Donald W. Pearman of the U.S. Dept. of Energy San Francisco Field Office reviewed recent changes in federal law that made transfer of technology from all government labs, and in particular from the DOE research establishment, more accessible to private industry. Dr. Pearman told his audience that the federal government is now clearly viewing the global competitiveness of U.S. companies as a critical component of U.S. national security. The National Technology Initiative (NTI) was discussed in the light of this new awareness, and several examples of DOE technology transfer "success stories" were offered. Following Dr. Pearman's address, Dr. J. A. Heim of the National Academy of Engineering addressed the complex issues surrounding manufacturing excellence. What elements must manufacturers identify and improve to compete in a global market? Dr. Heim discussed a set of broadly applicable, generic principles characteristic of world-class manufacturing practice. Dr. J. David Roessner of Georgia Institute of Technology put technology transfer into a national perspective. He discussed issues concerning the transfer from universities to industry, from federal labs to industry, and from a variety of sources to small businesses. His realistic assessment of this process to date is of value to all as this topic takes on added impetus in the future. Chapter 1 of the Review covers developments of standard techniques, which are still being actively pursued. This chapter contains papers on Elastic Wave Scattering, where emphasis is on crack-like scatterers. Wave behavior in the presence of material dispersion and anisotropy is the subject of the section on Elastic Wave Propagation. Papers on Eddy Currents treat detection, inversion, and modeling. The next section in this chapter is devoted to Radiography and Computed Tomography. The last two sections cover Optical Techniques and Thermal Techniques. Less widely used methods, which have generally not received as much attention as the well-established techniques, are collected in Chapter 2 on Evolving Inspection Technologies. These include Laser-Based illtrasonics and Electromagnetic Techniques, like microwaves and magneto-optics. The last section covers advances in Magnetic Resonance Methods. Chapter 3 collects the work presented on Interpretive Signal Processing and Image Analysis, with an emphasis on interpretation for the purposes of defect detection and characterization. This chapter contains three sections: one on Signal Processing, a second on Neural Networks, and the third on Imaging and Inversion Methods. Sensors constitute the front end of essentially all nondestructive measurements or observations. They are necessary to detect the probing field and alterations of the field resulting from interactions with the object of the inspection. Therefore, sensors playa central role in any inspection. Their importance to NDE has long been recognized, and so we devote an entire chapter to Sensors and New Techniques. Chapter 4 comprises three sections: Acoustic and illtrasonic Sensors, Electromagnetic Sensors, and New Techniques and Simulations. In this last group are techniques in which the sensor is a substantial part of the development Following a familiar pattern set in earlier volumes, Part A of the Review treats the subject of technique development, whereas Part B is dedicated to the theme of materials. At the head of the second book in Chapter 5 are collected several types of materials-related papers, where the common thread is the fact that materials are tailored to fill a specific function. The chapter is therefore entitled Engineered Materials and begins with contributions on Composite Properties. Composite Defects are covered in Section B. It is the nature of composites that they are mechanical combinations of different types of materials, each fulfilling a critical function in the performance of the composite material. The advantages gained in materials performance are tempered by the implied complications which arise when these materials are subjected to ultrasonic or eddy current inspection. Chapter 5 concludes with sections on Interfaces and Bonded Joints. This one chapter contains nearly 60 papers, a fifth of the entire book, indicating the importance of these materials to advanced technology. It is a well established fact that NDE is useful not only for locating and sizing defects, but also for assessing important physical properties. The next chapter on Material Properties collects those papers seeking to provide more generalized inspection information, beyond flaw location and size. Chapter 6 is divided into five sections. These cover contributions on Metals, Ceramics and Semiconductors, Microstructure and Roughness, Magnetic Methods and Materials, Thin Films and Coatings, and Corrosion. In the next chapter the materials-related themes continue with Nonlinearity, Deformation, and Fracture. All deal in some way with the nonlinear aspects of materials behavior. Chapter 7 includes two sections: one on Nonlinear Effects, and the other covering Stress and Fatigue Cracks. Due to the recent high level of interest in condition monitoring and defect detection in large-scale structures, the next chapter is devoted to Civil Structures and Materials. Chapter 8 includes papers on steel rope, concrete, wood, and radioactive waste confinement. vi Each promising NDE method under research and development will eventually need to be reduced to practice to evaluate its effectiveness and reliability in realistic inspection situations. This process includes the design and testing of instruments and hardware based on the method, whether the system is intended for post-manufacturing inspection or for application during manufacturing. Chapter 9 is devoted to Systems, Process Control, and Reliability. This subject is housed once again in Part B, since the topic is closely tied to applications of inspection technology. The organizing group, i.e. the Center for NDE at Iowa State University, wishes to acknowledge with thanks the important contributions made to the Review and to the preparation of these Proceedings by various groups and individuals. They are especially indebted to the keynote speaker, Dr. Donald W. Pearman, Jr., of the DOE Field Office, San Francisco, for his discussion of the National Technology Initiative and to Dr. J. A. Heim, National Academy of Engineering, and Prof. 1. David Roessner, Georgia Institute of Technology, for their excellent plenary presentations that dealt with requirements for manufacturing excellence and the status of technology transfer, respectively. They are also indebted to Dr. M. Avioli of EPR! and to Mr. Ward Rummel and a discussion panel for the Wednesday evening discussion of Probability of Detection concepts. A number of people from various institutions helped to organize useful special sessions. They include L. Adler, (Ohio State University), D. Jiles (ISU Center for NDE), J. Moulder (ISU Center for NDE), H. Ringennacher (United Technologies), S. Rokhlin (Ohio State University), B. VanderHeiden (Hercules, Inc.), and 1. Wagner (Johns Hopkins University Center for NDE). The session organized by H. Ringermacher on Laser Ultrasonics represented a milepost in that it was focused upon a review of "where are we?" in this new technology after several years of development. The results were most gratifying as can be verified in the contents of this volume. The organizers are also indebted to the session chairpersons for managing and keeping the sessions on time yet finding room for limited discussions. They are also indebted to Ms. Linda Penn, Ms. Teri Peterson, and Ms. Libby Bilyeu for their assistance both prior to and at the meeting and to Ms. Joann Wallace and Ms. Karen Cheney of Summit Associates, Inc., for their handling of conference logistics. The organizers, as always, are indebted to Ms. Connie Nessa and Ms. Sarah Jaqua for their dedicated and devoted attention to the preparation of meeting materials and the Proceeding manuscripts and all its parts. Finally, and by no means least, the organizers appreciate the support and contributions of the Review attendees both in their "real time" presentations and their prepared manuscripts without which these volumes would be impossible. Donald O. Thompson Director, Center for Nondestructive Evaluation, and Professor, Aerospace Engineering and Engineering Mechanics Iowa State University Ames, Iowa 50011 Dale E. Chimenti Associate Director, Center for Nondestructive Evaluation, and Research Professor, Department of Materials Science and Engineering The Johns Hopkins University Baltimore, Maryland 21218 VII CONTENTS VOLUME 12A MINISYMPOSIUM The National Technology Initiative Making Technology Partnerships with Government Work ................................. . D. W. Pearman, Jr. Fundamentals of Manufacturing Excellence........................................................ 23 J. A. Heim National Issues in Technology Transfer............................................................... 31 J. D. Roessner CHAPTER 1. DEVELOPMENTS OF STANDARD TECHNIQUES Section A. Elastic Wave Scattering High-Frequency Elastodynamic Boundary Integral Equation Inversion Using Asymptotic Phase Information.................................................. 41 R. A. Roberts Numerical Calculation of Diffraction Coefficients in Anisotropic Media. ...... .... .......... ........ ........ .......... ...... .......... .... ...... ........ ............... 49 J.A.G. Temple and L. White Ultrasonic Scattering from Spherically Orthotropic Shells.................................. 55 J. Mittleman, R. Roberts, and R. B. Thompson 2-D Elastodynamic Scattering from a Finite Closed Crack................................. 63 G. Persson The T Matrix for Elastic Scattering by a Partly Closed Circular Crack..... .... ...... .... ................. ... ........ ...... .......... .... .............. .................. .... 69 A. Eriksson i. A Theoretical Approach for the Discrimination of Crack Tip and Small Defect Echoes...................................................................................... 75 A. Lhemery, R. Raillon, and M. Ouamer Ultrasonic Scattering from a Crock which Emanates from a Rivet Hole............................................................................................................. 83 D. E. Budreck Scattering of a Sagittal Surface Acoustic Wave from a Large Amplitude Ridge or a Deep Groove..................................................................... 91 A. R. Baghai-Wadji, and A. A. Maradudin Reflection of Elastic Waves by an Array of Interface Cracks.............................. 99 1. Qu Scattering by an Infinite Array of Randomly Spaced Coplanar Cracks................................................................................................................... 107 Y. Mikata Section B. Elastic Wave Propagation Acoustic Ray Trocing with the Connection Machine........................................... 115 C. Sullivan, Y. Wang, R. A. Kline, R. B. Mignogna, R. S. Schechter P. P. Delsanto, and L. Ferrero Ultrasonic Field Patterns and Broadband Imaging-Simulations in Transversely Isotropic Media............................................................................... 123 M. Spies, P. Fellinger, U. Schleichert, and K. 1. Langenberg An Efficient FEM Approach for the Study of Ultrasonic Wave Propagation in Solids............................................................................................ 131 1. M. Sullivan, Jr., R. Ludwig, and W. 1. Grimes Improved Finite Difference Method for Long distance Propagation of Waves.......................................................... ................................. 139 D. Kishoni and S. Ta'asan High Accuracy Method of Measuring Travelling Time of Ultrasonic Waves.................................................................................................. 147 A. Khedher and B. de Halleux Phase Velocity and Attenuation of SH Waves in a Fiber- Reinforced Composite.......................................................................................... 155 R-B. Yang and A. K. Mal Ultrasonic Oblique Incidence in Anisotropic Media............................................ 163 X. Zhao and D. M. Egle Guided Waves in Piezoelectric Plates.................................................................. 171 H-T. Chien, A. H. Nayfeh, C-H. Yang, and D. E. Chimenti Interoction of Ultrasound with Imperfectly Contacting Interfaces ....... ...... ...... ...... ........ ...... ........ ...... .................... ...... ...... .......... .......... ..... 179 R. B. Thompson Nonspecular Reflection of Rotationally Symmetric Gaussian Beams from Shaped Fluid-Solid Interfaces.......................................................... 187 S. Zeroug and L. B. Felsen Interaction of Gaussian Acoustic Beams with Plane and Cylindrical Fluid-Loaded Elastic Structures........................................................ 195 J. Zhang, D. E. Chimenti, S. Zeroug, and L. B. Felsen Ultrasonic Propagation Through a Surface with a Step Discontinuity: Validation of a Hybrid, Gauss-Hermite Ray Tracing Beam Model................... ...... ................................................................... 203 M. S. Greenwood, J. L. Mai, A. Minachi, I. Yalda-Mooshabad, and R. B. Thompson Generation of Guided Waves in Hollow Cylinders by Wedge and Comb Type Transducers................... ........................................ ............ ......... 211 J. J. Ditri, J. L. Rose, and A. Pilarski Parallel Processing Technique for Acoustic Tomography of Multilayers ....................................................................................................... 219 R. B. Mignogna, R. S. Schechter, H. H. Chaskelis, P. P. Delsanto, L. Ferrero, R. Kline, and C. Sullivan Section C. Eddy Currents Solutions of Benchmark Problems in Eddy-Current NDE................................... 227 S. A. Jenkins, J. C. Treece, R. Kim Murphy, L. David Sabbagh, and H. A. Sabbagh Eddy Current Analysis for 3-D Problems Using the Boundary Element Method .................................................................................................................. 235 Y. Liu, N. Nakagawa, and F. Rizzo Inversion of Eddy Current Probe Impedance Data for Crack Reconstruction...................................................................................................... 243 J. R. Bowler, D. J. Harrison, and S. J. Norton Determining Conductivity and Thickness of Continuously Varying Layers on Metals Using Eddy Currents................................................................ 251 E. Uzal, J. C. Moulder, S. Mitra, and J. H. Rose A Model of Bolt Hole Inspection Via Eddy Current............................................ 259 N. Nakagawa and J. C. Moulder ACFM Above a Hemispherical Pit in an Aluminum Block................................. 265 D. McA. McKirdy and A. M. Lewis Mercury Modeling for Improved Crack Sizing in Tubing................................... 271 R. E. Shannon, W. R. Junker, N. Nakagawa, and M. Behravesh Multi-Parameter Analysis in Eddy Current Inspection of Aircraft Engine Components................................................................................ 279 A. Fahr, C. E. Chapman, A. Pelletier, and D. R. Hay XI