ADVANCES IN NONDESTRUCTIVE MATERIALS CHARACTERIZATION
Robert E. Green, Jr. NDE Center, The Johns Hopkins University, Baltimore, MD, USA
FULL-TEXT - ABSTRACT The John Hopkins University Center for Nondestructive Evaluation (CNDE) is an interdisciplinary cooperative center between the university, government, and industrial organizations dedicated to the development of more accurate and innovative methods for the nondestructive evaluation of materials and to the education of talented students. This presentation will discuss several innovative nondestructive materials characterization methods developed in the CNDE. Lasers, optical interferometers, electro-magnetic transducers (EMATs), and air (Gas) coupled systems are used for non-contact generation and detection of ultrasonic waves to inspect art paintings, wood, metals and composites. High resolution optical holographic interferometry is used for leak testing and imaging surface acoustic and shock waves. A variety of techniques detect fatigue damage in thick composites. Nonlinear ultrasound distinguishes between good and bad adhesive bonds. Computer assisted x-ray tomography permits imaging of the internal structures of ultralightweight metals. X-ray diffraction permits imaging of defects in gallium arsenide wafers, defects and vibrational modes of quartz crystals, and microstructure of nickel alloy single crystal turbine blades.
Publication Source: NDTISS '99 - International Symposium on NDT Contribution to the Infrastructure Safety Systems, Nov 1999 in Tores Brazil.
Publisher: Center of Tecnology, Federal University of Santa Maria (UFSM) - [Homepage]
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