Toward Robust Shm And Nde Of Plate Like Structures Using Nonlinear Guided Wave Features

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Measurement Of Nonlinear Ultrasonic Characteristics

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Author : Kyung-Young Jhang
language : en
Publisher: Springer Nature
Release Date : 2020-01-14

Measurement Of Nonlinear Ultrasonic Characteristics written by Kyung-Young Jhang and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-01-14 with Technology & Engineering categories.

Conventional ultrasonic methods based on ultrasonic characteristics in the linear elastic region are mainly sensitive to mature defects but are much less responsive to micro-damage or incipient material degradation. Recently, nonlinear ultrasonic characteristics beyond the linear ultrasonic amplitude range have been studied as a method for overcoming this limitation, and hence, many researchers are engaged in theoretical, experimental, and various application studies. However, the nonlinear ultrasonic characteristics are quite exacting compared to the linear phenomena so that they require vast experience and high proficiency in order to obtain proper experimental data. Actually, many researchers, especially beginners including graduate students, have difficulty in reliably measuring nonlinear ultrasonic characteristics. This book provides key technological know-how from experts with years of experience in this field, which will help researchers and engineers to obtain a clear understanding and high quality data in the nonlinear ultrasonic experiments and applications.

Toward Robust Shm And Nde Of Plate Like Structures Using Nonlinear Guided Wave Features

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Author : Hwanjeong Cho
language : en
Publisher:
Release Date : 2017

Toward Robust Shm And Nde Of Plate Like Structures Using Nonlinear Guided Wave Features written by Hwanjeong Cho and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.

Ultrasonics provides a well-defined methodology for detecting and characterizing defects in materials. In particular, emerging ultrasonic guided waves techniques for advanced non-destructive evaluation (NDE) and structural health monitoring (SHM) applications aim for improved detection reliability and faster inspections. While the sensitivity of linear ultrasonics widely used for many conventional techniques is limited to defect sizes in the order of millimeters, nonlinear ultrasonics can provide opportunities to develop new techniques that enable detection of incipient micro-scale damage that precedes macro-scale cracks and delaminations. Thus, nonlinear ultrasonic guided waves are rapidly developing techniques that possess significant potential for early damage detection capabilities to be incorporated into emerging NDE and SHM techniques.The goal of this dissertation is to investigate several key aspects of generation and reception of nonlinear guided waves in plates based on understanding wave mechanics and nonlinear physics. This dissertation begins by discussing a multi- element PVDF (polyvinylidene difluoride) sensor able to detect guided waves polarized as either Rayleigh-Lamb (RL) or shear horizontal (SH) modes and determine their wavelength. A uniaxial polyvinylidene difluoride (PVDF) film is employed and rotated 45 to enable the coupling between in-plane shear deformation and the electric displacement in the out-of-plane direction. The multi- element configuration guarantees the wavenumber-frequency analysis for modal decomposition. Accompanying numerical and experimental studies validate the outstanding advantages such a low-profile, low-mass, conformable, inexpensive sensor ideal for SHM and other applications.The development of the new PVDF sensing method spurs investigation on its capability to detect localized fatigue damage in an aluminum plate with a nonlinear SH-SH guided wave interaction that results in another RL guided wave generation. A mode triplet (SH-SH-RL modes) is selected based on the theoretical formulation for mutual interaction of guided waves in plates and the corresponding mode selection criteria. The finite element simulations explore several numerical aspects of the associated wave propagation, interaction of the selected mode triplet, and mode identification. Laboratory experiments confirm second harmonic generation in an aluminum plate using the PVDF sensor by conducting frequency-wavenumber and other analyses, which are later used to detect localized fatigue damage in an aluminum plate with a new scanning technique.The utility of PVDF is further extended to both actuation and reception of self- interacting second harmonic guided waves to detect fatigue damage accumulation in an aluminum plate subject to cyclic mechanical loading. A comb type dual PVDF transmitter is designed to selectively actuate finite amplitude symmetric RL waves that in turn generate second harmonics. Self-interacting S1-S2 mode nonlinear guided wave measurements from an aluminum plate with progressive, but invisible, fatigue damage demonstrates the excellent robustness and sensitivity of PVDF transducers as well as early damage detection capabilities of nonlinear guided waves before catastrophic failures.Furthermore, to facilitate advancing to studies of nonlinear guided waves in anisotropic and layered media, this dissertation also discusses second harmonic generation in composite plates from theoretical and numerical standpoints. A theo- retical framework to analyze second harmonic generation in transversely isotropic plates is presented. Conditions for internal resonance are derived, followed by expanded mode pair selection strategies. Then, finite element simulations are con- ducted to confirm the predicted generation of second harmonic in a unidirectional lamina and quasi-isotropic laminate.Finally, the importance of skew angles on the generation of cumulative second harmonics in composite plates is emphasized by investigating the selection of internally resonant mode pairs under the influence of skewing guided waves. The skew angle occurs when wave velocities are directionally dependent and it causes deviation of the energy velocity vector from the intended wave vector. Taking into account the wave skewing effect, the skew angle matching condition is discussed for selecting mode pairs in a transversely isotropic plate and a quasi-isotropic laminate. Numerical simulations revealed that the effect of skew angle mismatch can be significant for second harmonic generation in anisotropic media.

Sensors For Ultrasonic Ndt In Harsh Environments

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Author : Anthony N Sinclair
language : en
Publisher: MDPI
Release Date : 2020-05-13

Sensors For Ultrasonic Ndt In Harsh Environments written by Anthony N Sinclair and has been published by MDPI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-05-13 with Technology & Engineering categories.

In this Special Issue of Sensors, seven peer-reviewed manuscripts appear on the topic of ultrasonic transducer design and operation in harsh environments: elevated temperature, high gamma and neutron radiation fields, or the presence of aggressive chemicals. Motivations for these research and development projects are strongly focused on nuclear power plant inspections (particularly liquid-sodium cooled reactors), and nondestructive testing of high-temperature piping installations. It is anticipated that extensive use of permanently mounted robust transducers for in-service monitoring of petrochemical plants and power generations stations; quality control in manufacturing plants; and primary and secondary process monitoring in the fabrication of engineering materials will soon be made.

Structural Health Monitoring Shm In Aerospace Structures

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Author : Fuh-Gwo Yuan
language : en
Publisher: Woodhead Publishing
Release Date : 2016-03-01

Structural Health Monitoring Shm In Aerospace Structures written by Fuh-Gwo Yuan and has been published by Woodhead Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-03-01 with Technology & Engineering categories.

Structural Health Monitoring (SHM) in Aerospace Structures provides readers with the spectacular progress that has taken place over the last twenty years with respect to the area of Structural Health Monitoring (SHM). The widespread adoption of SHM could both significantly improve safety and reduce maintenance and repair expenses that are estimated to be about a quarter of an aircraft fleet's operating costs. The SHM field encompasses transdisciplinary areas, including smart materials, sensors and actuators, damage diagnosis and prognosis, signal and image processing algorithms, wireless intelligent sensing, data fusion, and energy harvesting. This book focuses on how SHM techniques are applied to aircraft structures with particular emphasis on composite materials, and is divided into four main parts. Part One provides an overview of SHM technologies for damage detection, diagnosis, and prognosis in aerospace structures. Part Two moves on to analyze smart materials for SHM in aerospace structures, such as piezoelectric materials, optical fibers, and flexoelectricity. In addition, this also includes two vibration-based energy harvesting techniques for powering wireless sensors based on piezoelectric electromechanical coupling and diamagnetic levitation. Part Three explores innovative SHM technologies for damage diagnosis in aerospace structures. Chapters within this section include sparse array imaging techniques and phase array techniques for damage detection. The final section of the volume details innovative SHM technologies for damage prognosis in aerospace structures. This book serves as a key reference for researchers working within this industry, academic, and government research agencies developing new systems for the SHM of aerospace structures and materials scientists. - Provides key information on the potential of SHM in reducing maintenance and repair costs - Analyzes current SHM technologies and sensing systems, highlighting the innovation in each area - Encompasses chapters on smart materials such as electroactive polymers and optical fibers

Structural Health Monitoring

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Author : Daniel Balageas
language : en
Publisher: John Wiley & Sons
Release Date : 2010-01-05

Structural Health Monitoring written by Daniel Balageas and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-01-05 with Technology & Engineering categories.

This book is organized around the various sensing techniques used to achieve structural health monitoring. Its main focus is on sensors, signal and data reduction methods and inverse techniques, which enable the identification of the physical parameters, affected by the presence of the damage, on which a diagnostic is established. Structural Health Monitoring is not oriented by the type of applications or linked to special classes of problems, but rather presents broader families of techniques: vibration and modal analysis; optical fibre sensing; acousto-ultrasonics, using piezoelectric transducers; and electric and electromagnetic techniques. Each chapter has been written by specialists in the subject area who possess a broad range of practical experience. The book will be accessible to students and those new to the field, but the exhaustive overview of present research and development, as well as the numerous references provided, also make it required reading for experienced researchers and engineers.

Structural Health Monitoring 2015

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Author : Fu-Kuo Chang
language : en
Publisher:
Release Date : 2015

Structural Health Monitoring 2015 written by Fu-Kuo Chang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Automatic data collection systems categories.

Ultrasonic Guided Waves In Solid Media

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Author : Joseph L. Rose
language : en
Publisher: Cambridge University Press
Release Date : 2014-08-11

Ultrasonic Guided Waves In Solid Media written by Joseph L. Rose and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-08-11 with Medical categories.

Ultrasonic guided waves in solid media are important in nondestructive testing and structural health monitoring, as new faster, more sensitive, and economical ways of looking at materials and structures have become possible. This book can be read by managers from a "black box" point of view, or used as a professional reference or textbook.

Wireless Sensor Systems For Extreme Environments

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Author : Habib F. Rashvand
language : en
Publisher: John Wiley & Sons
Release Date : 2017-08-14

Wireless Sensor Systems For Extreme Environments written by Habib F. Rashvand and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-08-14 with Technology & Engineering categories.

Provides unique coverage of wireless sensor system applications in space, underwater, underground, and extreme industrial environments in one volume This book covers the challenging aspects of wireless sensor systems and the problems and conditions encountered when applying them in outer space, under the water, below the ground, and in extreme industrial environments. It explores the unique aspects of designs and solutions that address those problems and challenges, and illuminates the connections, similarities, and differences between the challenges and solutions in those various environments. The creation of Wireless Sensor Systems for Extreme Environments is a response to the spread of wireless sensor technology into fields of health, safety, manufacturing, space, environmental, smart cities, advanced robotics, surveillance, and agriculture. It is the first of its kind to present, in a single reference, the unique aspects of wireless sensor system design, development, and deployment in such extreme environments—and to explore the similarities and possible synergies between them. The application of wireless sensor systems in these varied environments has been lagging dramatically behind their application in more conventional environments, making this an especially relevant book for investigators and practitioners in all of these areas. Wireless Sensor Systems for Extreme Environments is presented in five parts that cover: Wireless Sensor Systems for Extreme Environments—Generic Solutions Space WSS Solutions and Applications Underwater and Submerged WSS Solutions Underground and Confined Environments WSS Solutions Industrial and Other WSS Solutions This book is a welcome guide for researchers, post-graduate students, engineers and scientists who design and build operational and environmental control systems, emergency response systems, and situational awareness systems for unconventional environments.

Emerging Technologies In Non Destructive Testing Vi

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Author : Danny Van Hemelrijck
language : en
Publisher: CRC Press
Release Date : 2015-11-24

Emerging Technologies In Non Destructive Testing Vi written by Danny Van Hemelrijck and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-11-24 with Technology & Engineering categories.

Non-Destructive Testing (NDT) is of worldwide significance, and is strongly related to the detection of damage in engineering structures (buildings, bridges, aircrafts, ships, pressure vessels, etc.) using non-invasive techniques (ultrasound, X-rays, Radar, neutrons, thermography, vibrations, acoustic emission, etc.). Emerging Technologies in Non-D

Ultrasonic Waves In Solid Media

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Author : Joseph L. Rose
language : en
Publisher: Cambridge University Press
Release Date : 1999

Ultrasonic Waves In Solid Media written by Joseph L. Rose and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Science categories.

Explains the physical principles of wave propagation and relates them to ultrasonic wave mechanics and the more recent guided wave techniques that are used to inspect and evaluate aircraft, power plants, and pipelines in chemical processing. An invaluable reference to this active field for graduate students, researchers, and practising engineers.