Mutual Nonlinear Interaction Of Ultrasonic Guided Waves In Plate Applications For Nde
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Mutual Nonlinear Interaction Of Ultrasonic Guided Waves In Plate Applications For Nde
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Author : Mostafa Hasanian
language : en
Publisher:
Release Date : 2019
Mutual Nonlinear Interaction Of Ultrasonic Guided Waves In Plate Applications For Nde written by Mostafa Hasanian and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
Nondestructive Evaluation (NDE) and Structural Health Monitoring (SHM) of materials are investigated through nonlinear ultrasonics. The material nonlinearity associated with microstructural features distorts the ultrasonic wave packet, altering the frequency spectrum. Since microstructural changes precede macroscale damage, nonlinear ultrasonics provides the unique opportunity to diagnose material degradation early in its progression. Thus, the unique sensitivity of nonlinear ultrasonic waves to microstructural damage is the motivation for the current study to develop more reliable methods to detect early damage in materials. Ultrasonic guided waves, which travel in a bounded medium, are of great interest due to particular advantages such as rapid scanning of plates. The focus of this dissertation is on the mutual interaction of guided waves in a plate, which occurs when multiple waves propagating in the plate mix together. The wave vectors are considered to form the nonlinear stress fields associated with the interaction of two different guided waves with arbitrary mixing angle. By solving the differential equations, the conditions that generate the strong and cumulative nonlinear perturbations are found. Based on internal resonance conditions, the wave triplets (two primary waves and the secondary wave) determined form the basis for experimental studies and numerical simulations. An analytical model is given which simulates the interaction of guided waves with finite wave packets. The rest of the dissertation is on demonstrating the proposed experimental techniques and then exploring the results. Codirectional shear horizontal guided wave mixing is considered, where limited cumulative behavior of out-of-plane displacements is used for early damage characterization. In addition, interaction counter-propagating shear horizontal guided waves is studied. The results indicate the strong generation of a secondary wave field that travels independently from primary wave packets.
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.
Nonlinear Ultrasonic Guided Waves
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Author : Cliff J. Lissenden
language : en
Publisher: IOP Publishing Limited
Release Date : 2024-06-20
Nonlinear Ultrasonic Guided Waves written by Cliff J. Lissenden and has been published by IOP Publishing Limited this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-06-20 with Science categories.
The book sets the stage for nonlinear guided waves by introducing nonlinear wave propagation in 1D and expanding the mathematical treatment to guided waves. It considers self-interaction for harmonic generation and mutual interactions for wave mixing. It demonstrates the characteristics of nonlinear guided waves numerically and experimentally.
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
Metals Abstracts
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Author :
language : en
Publisher:
Release Date : 1994
Metals Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Metallurgy categories.
Btl Talks And Papers
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Author : Bell Telephone Laboratories. Technical Information Libraries
language : en
Publisher:
Release Date : 1964
Btl Talks And Papers written by Bell Telephone Laboratories. Technical Information Libraries and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1964 with Electrical engineering categories.
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.
Acoustic Emission Testing
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Author : Christian U. Grosse
language : en
Publisher: Springer Science & Business Media
Release Date : 2008-07-12
Acoustic Emission Testing written by Christian U. Grosse and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-07-12 with Technology & Engineering categories.
Acoustic Emission (AE) techniques have been studied in civil engineering for a long time. The techniques are recently going to be more and more applied to practical applications and to be standardized in the codes. This is because the increase of aging structures and disastrous damages due to recent earthquakes urgently demand for maintenance and retrofit of civil structures in service for example. It results in the need for the development of advanced and effective inspection techniques. Thus, AE techniques draw a great attention to diagnostic applications and in material testing. The book covers all levels from the description of AE basics for AE beginners (level of a student) to sophisticated AE algorithms and applications to real large-scale structures as well as the observation of the cracking process in laboratory specimen to study fracture processes.
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.
Applied Mechanics Reviews
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Author :
language : en
Publisher:
Release Date : 1995
Applied Mechanics Reviews written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Mechanics, Applied categories.