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This volume (Parts A and B) contains the edited papers presented at the annual Review of Progress in Quantitative Nondestructive Evaluation held at the University of California - San Diego, La Jolla, CA, on August 1-5, 1988. The Review was organized by the Center for NDE at Iowa State University and the Ames Laboratory of the U. S. Department of Energy in cooperation with the Air Force Materials Laboratory, the Office of Basic Energy Sciences, USDOE, the Office of Naval Research, the NASA-Langley Research Center, and The Metallurgical Society (TMS). Yith a total of over 450 participants from the US and nine foreign countries who presented a record 325 papers, this conference has grown into the largest, most significant gathering of NDE researchers and engineers anywhere in the Yest. The meeting was divided into 36 sessions with as many as four sessions running concurrently. All stages of NDE development from basic research investigations to early engineering applications and all methods of inspection science from ultrasonics to x-ray tomography were covered. Following a pattern now familiar to regular attendees of the Review and readers of the Proceedings, the editors have organized the papers in the Proceedings according to topical subject headings rather than the original order of presentation. This rearrangement yields a more user­ friendly reference work. Part A of the Proceedings treats NDE technique development whereas Part B is organized around the theme of materials.

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 Washington, Seattle on July 30 to August 4, 1995. The Review was organized by the Center for NDE at Iowa State University, in cooperation with the Ames Laboratory of the USDOE, the American Society of Nondestructive Testing, the Department of Energy, the National Institute of Standards and Technology, the Federal Aviation Administration, the National Science Foundation IndustryiUniversity Cooperative Research Centers, and the Working Group in Quantitative NDE. This year's Review of Progress in QNDE was attended by approximately 450 participants from the US and many foreign countries who presented over 375 papers. 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 many important methods of inspection science from acoustics to x-rays. In the last several years, the Review has stabilized at about its current size. Most participants seem to agree it is large enough to permit a full-scale overview of the latest developments but still small enough to retain the collegial atmosphere which has marked the Review since its inception. The Proceedings are structured in a format to reflect the organization of the Review itself, producing a more logical organization for both the meeting and the present volume.

The objective of this study was to increase the understanding of damage in composite materials with through-the-thickness reinforcements. As a first step it was necessary to develop new ultrasonic imaging technology to better assess internal damage of the composite. A useful ultrasonic imaging technique has been successfully developed to assess the internal damage of composite panels. The ultrasonic technique accurately determines the size of the internal damage. It was found that the ultrasonic imaging technique was better able to assess the damage in a composite panel with through-the-thickness reinforcements than by destructively sectioning the specimen and visual inspection under a microscope. Microscopic determination of crack location and lengths in a composite panel with through-the-thickness reinforcements was almost impossible. Five composite compression-after-impact panels were tested. The compression-after-impact strength of the panels with the through-the­ thickness reinforcements was almost twice that of the comparable panel without through-the-thickness reinforcement. REFERENCES 1. B.T. Smith, J.S. Heyman, A.M. Buoncristiani, Earl D. Blodgett, J.G. Miller, and S.M. Freeman, Correlation of the Deply TechniQue with the Ultrasonic Imaging of Impact Damage in Graphite/Epoxy Composites, Materials Evaluation, vol. 47, NO. 12, December 1989, pp 1408-1416. 2. NASA Tech Briefs, June 1987, p. 28. 3. P.M. Gammel, Improved Ultrasonic Detection using Analytic Signal Magnitude. Ultrasonics, Vol. 19, March 1981, pp 73-76. 4. R.C. Heyser, Determination of Loudspeaker Signal Arrival Times Part ~ Journal of the Audio Engineering Society, Vol. 19, Dec. 1971, pp 902-905.

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 Snowmass Village, Colorado, on July 31 to August 4, 1994. The Review was organized by the Center for NDE at Iowa State University, in cooperation with the Ames Laboratory of the US DOE, the Materials Directorate of the Wright Laboratory, Wright-Patterson Air Force Base, the American Society of Nondestructive Testing, the Department of Energy, the National Institute of Standards and Technology, the Federal Aviation Administration, the National Science Foundation Industry/University Cooperative Research Centers, and the Working Group in Quantitative NDE. This year's Review of Progress in QNDE was attended by approximately 450 participants from the U.S. and many foreign countries who presented over 360 papers. 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 many important methods of inspection science from acoustics to x-rays. In the last eight to ten years, the Review has stabilized at about its current size, which most participants seem to agree is large enough to permit a full-scale overview of the latest developments, but still small enough to retain the collegial atmosphere which has marked the Review since its inception.