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Nondestructive evaluation (NDE) procedures are needed for materials
processing, as well as for post-process materials testing. They
play important roles in product design, analysis of service-life
expectancy, manufacturing and quality control of manufactured
products. They are also essential to on-line monitoring of the
integrity of structural elements and complex systems. Rational
accept and reject criteria should be based on NDE tests. Critical
safety, efficiency and operational features of large-scale
structures depend on adequate NDE capabilities. The lectures
presented in this volume are concerned with quantitative ultrasonic
NDE. They present fundamental concepts and basic theory, as well as
applications to the detection of cracks and the evaluation of
material properties. The following topics are discussed: basic wave
propagation theory for ultrasonic NDE; piezoelectric transducers,
EMATS and ultrasonic spectroscopy; laser-based ultrasonics;
acoustoelasticity; ultrasound in solids with porosity,
microcracking and polycrystalline structuring; the determination of
mechanical properties of composite materials; inverse problems and
imaging.
The reciprocity theorem has been used for over 100 years to establish interesting and useful relationships and to formulate problems. Internationally distinguished for his contributions to mechanics, Jan Achenbach presents a novel method of solving wave fields. The material presented here is relevant to applications in engineering and applied physics such as ultrasonics for medical imaging and non-destructive evaluation, acoustic microscopy, seismology, exploratory geophysics, and structural acoustics.
Current economics often dictate the use of structures well beyond
their design lives. Today, there is an increased reliance on
nondestructive evaluation (NDE) to provide accurate data about the
health of materials in these aging systems. Examples of such
structures include aircraft, bridges, nuclear reactors, roads,
ships, industrial manufacturing facilities, storage vessels for
both toxic and nontoxic substances, electronic hardware, etc. This
book looks at ways to develop new NDE techniques for aging
materials. Special emphasis is given to the structural health of
concrete, defects in high-strength aircraft materials and the
characterization of steels in nuclear reactors. One intriguing new
technology, borrowed from the semiconductor industry, is the use of
very small micro-electro-mechanical systems (MEMS) to monitor
materials properties in situ. Using these devices in networks
should permit both real-time monitoring of materials properties
during operation and the anticipation of component failure. The
book also explores the many potentially fertile collaborative
research opportunities between NDE and noninvasive medical
diagnostic procedures.
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