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UT '96 CD-ROM
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"The ASNT Marketing Department is developing new policies on all of the Society's public
relations through electronic media. Until those programs are completed, press credentials
are being issued only to print media representatives." |
We will, therefore, be unable to report on the ASNT Spring Conference this year. As a member in good standing of ASNT, we have some concerns about this policy, as it appears inconsistent with the ASNT Mission and Code of Ethics. We were accredited at ASNT Fall'96 Conference; were they unhappy with our Seattle Report ?
Fortunately, other Societies have different views. We will report on the DGZfP '97 NDT Conference (as much as possible in English for our international readers! Please see Report 1996).
Imaging of Disbond in Adhesive Joints with Lamb
Lamb waves are increasingly attractive for nondestructive testing of adhesively bonded structures due to their unique properties. Larger areas can be inspected using single pulse excitation compared to localized point-by-point standard bulk wave ultrasonic testing with only two modes, longitudinal or shear waves. The objective of this work was to study the sensitivity and efficiency of adhesive bond inspection using Lamb waves and to facilitate the interpretation through imaging. By V. MUSTAFA, A. CHAHBAZ, D. R. HAY, M. BRASSARD
Guided Wave Applications of Piezocomposite Transducers |
Guided Wave Inspection is capable of interrogating large areas of the material without extensive transducer scanning. An important requirement in this method is the ability to utilize relatively broad bandwidth transducers in the test. This paper presents the concepts on which Guided Wave Inspection is based as well as piezocomposite transducer design considerations which increase the usefulness of the inspection method. By Paul A. Meyer, Ph.D.and Joseph L. Rose
|Advances in Ultrasonic Inspection Techniques for Monitoring the Powder Injection Molding Process|
Recently, guided waves have been considered as potential tools for monitoring the powder injection molding process. This work relies on the integration of guided wave mechanics modeling and viscoelasticity. Using the theoretical model as a guideline, guided wave modes with optimum sensitivity to PIM defects can be selected for inspection purposes. This technology is applied to in- situ inspection of a powder injection molded part, a cylindrical motor component, for defect detection. Joseph L. Rose, Randall M. German, and Derrick D. Hongerholt
Detection of Corrosion in Bottom Plates of Gas and Oil Tanks using guided ultrasonic waves and EMATs
Guided ultrasonic waves are capable of detecting corrosion in the bottom plates of storage tanks. Couplant-free EMATS search units allow for a time-saving, accurate inspection without cleaning of the coupling surface. This ultrasonic technique has a large potential for providing faster and more economical inspections. By Dr. Hans-Jürgen SALZBURGER and Dr. Gerhard HÜBSCHEN
Application of Guided Acoustic Waves to Delamination Detection |
In summary, guided plate waves are able to interact with structural flaws such as delaminations and cracks due to propagation properties highly sensitive to the thickness in materials. With its technical advantages, this technique shows its potential application to large area structural integrity assessment. By Keun J. Sun. The work is supported by NASA-Langley Research Center.
Another Article for download as Postscript Version: Disbond Detection in Bonded Aluminum Joints Using Lamb Wave Amplitude and Time-Of Flight.
Bond strength measurement in a three layer sandwich |
Acoustic wave propagation in a three-layer wave guiding configuration is presented. Considering an adhesive layer as a waveguide structure, it is shown that the propagation of guided modes is affected by the bonding quality. Ultrasonic surface waves have been generated by a piezoelectric transducer and the detection is performed using an optical interferometer. By L. Singer
|Other sources on Lamb Waves (Guided Waves)||
Ultrasonic Appications Highlights - Part 2
For this edition of "the echo" a wide range of test problems, processed by Krautkraemer's applicaction laboratory, has been selected. Here the main emphasis is on immersion testing with scan presentation. Echo 34 - edited by U. Huhn, W.-D. Kleinert, R. Krause, H. Neuhaus
Include detailed information on UT of Welds on Chain Spreaders
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QIRT '96 - 3. Europäische Thermographietagung an der Universität Stuttgart
Unter dem Titel QIRT '96 (Quantitative Infrarot Thermography) fand an der Universität Stuttgart vom 2. bis 5. September das dritte
Eurotherm Seminar zu Fragen der Thermographie statt. By Prof. Dr. G. Busse
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Four U.S., Canadian, and British organizations have formed a $5.3 million venture to develop additional ultrasonic tools for detecting stress corrosion cracking in pipelines. (9 Dec 96 NEWSWIRE)
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