Nonlinear Ultrasonic Guided Waves PDF Download
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Author: Cliff J. Lissenden
Publisher:
ISBN: 9780750349093
Category : Technology & Engineering
Languages : en
Pages : 0
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Book Description
Author: Cliff J. Lissenden
Publisher:
ISBN: 9780750349093
Category : Technology & Engineering
Languages : en
Pages : 0
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Book Description
Author: Kyung-Young Jhang
Publisher: Springer Nature
ISBN: 9811514615
Category : Technology & Engineering
Languages : en
Pages : 294
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Book Description
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.
Author: Mostafa Hasanian
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
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.
Author: Tribikram Kundu
Publisher: Springer
ISBN: 3319944762
Category : Technology & Engineering
Languages : en
Pages : 759
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Book Description
This multi-contributed volume provides a practical, applications-focused introduction to nonlinear acoustical techniques for nondestructive evaluation. Compared to linear techniques, nonlinear acoustical/ultrasonic techniques are much more sensitive to micro-cracks and other types of small distributed damages. Most materials and structures exhibit nonlinear behavior due to the formation of dislocation and micro-cracks from fatigue or other types of repetitive loadings well before detectable macro-cracks are formed. Nondestructive evaluation (NDE) tools that have been developed based on nonlinear acoustical techniques are capable of providing early warnings about the possibility of structural failure before detectable macro-cracks are formed. This book presents the full range of nonlinear acoustical techniques used today for NDE. The expert chapters cover both theoretical and experimental aspects, but always with an eye towards applications. Unlike other titles currently available, which treat nonlinearity as a physics problem and focus on different analytical derivations, the present volume emphasizes NDE applications over detailed analytical derivations. The introductory chapter presents the fundamentals in a manner accessible to anyone with an undergraduate degree in Engineering or Physics and equips the reader with all of the necessary background to understand the remaining chapters. This self-contained volume will be a valuable reference to graduate students through practising researchers in Engineering, Materials Science, and Physics. Represents the first book on nonlinear acoustical techniques for NDE applications Emphasizes applications of nonlinear acoustical techniques Presents the fundamental physics and mathematics behind nonlinear acoustical phenomenon in a simple, easily understood manner Covers a variety of popular NDE techniques based on nonlinear acoustics in a single volume
Author: Thibaut Bernard Autrusson
Publisher:
ISBN:
Category : Service life (Engineering)
Languages : en
Pages :
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Book Description
Material damage such as dislocations and microcracks are characteristic of early stages of fatigue. Accumulation of these nascent cracks leads to non-linear elastic response of the material. These non-linearities can be detected from harmonic generation for propagating elastic waves. The long term goal of this study is to investigate the non-linear elastic propagation in parts with complex geometry. Cellular Automata is introduced as a new simulation method, in order to develop new analysis on quadratic non-linearities. An existing linear code was progressively modified to take into account a different constitutive law. Also the boundary conditions need to be reviewed to ensure free stress with the non-linear behavior. The propagation of the longitudinal wave is investigated in detail. Numerical accuracy is validated from comparison with a closed, for both linear and non-linear code. The reflection of the non-linear P-wave gives confirmation for the correct treatment of the boundary condition. Finally the capabilities of the Cellular Automata code are underlined for reflection of Lamb waves for various boundary conditions.
Author: Joseph L. Rose
Publisher: Cambridge University Press
ISBN: 113991698X
Category : Science
Languages : en
Pages : 551
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Book Description
Ultrasonic guided waves in solid media have become a critically important subject in nondestructive testing and structural health monitoring, as new faster, more sensitive, and more economical ways of looking at materials and structures have become possible. This book will lead to fresh creative ideas for use in new inspection procedures. Although the mathematics is sometimes sophisticated, the book can also be read by managers without detailed understanding of the concepts as it can be read from a 'black box' point of view. Overall, the material presented on wave mechanics - in particular, guided wave mechanics - establishes a framework for the creative data collection and signal processing needed to solve many problems using ultrasonic nondestructive evaluation and structural health monitoring. The book can be used as a reference in ultrasonic nondestructive evaluation by professionals and as a textbook for seniors and graduate students. This work extends the coverage of Rose's earlier book Ultrasonic Waves in Solid Media.
Author: Cliff Lissenden
Publisher: MDPI
ISBN: 3039282980
Category : Technology & Engineering
Languages : en
Pages : 376
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Book Description
The propagation of ultrasonic guided waves in solids is an important area of scientific inquiry, primarily due to their practical applications for nondestructive characterization of materials, such as nondestructive inspection, quality assurance testing, structural health monitoring, and providing a material state awareness. This Special Issue of Applied Sciences covers all aspects of ultrasonic guided waves (e.g., phased array transducers, meta-materials to control wave propagation characteristics, scattering, attenuation, and signal processing techniques) from the perspective of modeling, simulation, laboratory experiments, or field testing. In order to fully utilize ultrasonic guided waves for these applications, it is necessary to have a firm grasp of their requisite characteristics, which include that they are multimodal, dispersive, and are comprised of unique displacement profiles through the thickness of the waveguide.
Author: Alain Leger
Publisher: Springer Science & Business Media
ISBN: 3540891056
Category : Technology & Engineering
Languages : en
Pages : 427
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Book Description
Non Destructive Testing and Non Destructive Evaluation using Ultrasounds covers an important field of applications and requires a wide range of fundamental theoretical, numerical and experimental investigations. In the present volume, the reader will find some relevant research results on wave propagation in complex materials and structures which are concerned with today’s problems on composites, bonding, guided waves, contact or damage, imaging and structural noise. The fifth meeting of the Anglo-French Research Group on "Wave propagation in non homogeneous media with a view to Non Destructive testing" was held in Anglet, France, June 2-6, 2008.
Author: Joseph L. Rose
Publisher: Cambridge University Press
ISBN: 1107048958
Category : Medical
Languages : en
Pages : 551
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Book Description
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.
Author: Vamshi Chillara
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Ultrasound is widely employed in Nondestructive Evaluation (NDE) and Structural Health Monitoring (SHM) applications to detect and characterize damage/defects in materials. In particular, ultrasonic guided waves are considered a foremost candidate for in-situ monitoring applications. Conventional ultrasonic techniques rely on changes/discontinuities in linear elastic material properties, namely the Young's modulus and shear modulus to detect damage. On the other hand, nonlinear ultrasonic techniques that rely on micro-scale nonlinear material/structural behavior are proven to be sensitive to damage induced microstructural changes that precede macro-scale damage and are hence capable of early damage detection. The goal of this thesis is to investigate the capabilities of nonlinear guided waves -- a fusion of nonlinear ultrasonic techniques with the guided wave methodologies for early damage detection. To that end, the thesis focuses on two important aspects of the problem:Wavemechanics - deals with ultrasonic guided wave propagation in nonlinear waveguides;Micromechanics - deals with correlating ultrasonic response with micro-scale nonlinear material behavior.For the development of efficient NDE and SHM methodologies that incorporate nonlinear structural features, a detailed understanding of the above aspects is indispensable. In this thesis, the wavemechanics aspect of the problem is dealt with from both theoretical and numerical standpoints. A generalized theoretical framework is developed to study higher harmonic guided waves in plates. This was employed to study second harmonic guided waves in pipes using a large-radius asymptotic approximation. Second harmonic guided waves in plates are studied from a numerical standpoint. Theoretical predictions are validated and some key aspects of higher harmonic generation in waveguides are outlined. Finally, second harmonic guided waves in plates with inhomogeneous and localized nonlinearities are studied and some important aspects of guided wave mode selection are addressed.The other part of the work focused on developing a micromechanics based understanding of ultrasonic higher harmonic generation. Three important aspects of micro-scale material behavior, namely tension-compression asymmetry, shear-normal coupling and deformation induced asymmetry are identified and their role in ultrasonic higher harmonic generation is discussed. Tension-compression asymmetry is identified to cause second (even) harmonic generation in materials. Then, shear-normal coupling is identified to cause generation of secondary waves of different polarity than the primary waves. In addition, deformation induced anisotropy due to the presence of residual stress/strain and its contribution to ultrasonic higher harmonic generation is qualitatively discussed. Also, the tension-compression asymmetry in the material is quantified using an energy based measure. The above measure is employed to develop a homogenization based approach amenable to multi-scale analysis to correlate microstructure with ultrasonic higher harmonic generation.Finally, experimental investigations concerning third harmonic SH wave generation in plates are carried out and the effect of load and temperature changes on nonlinear ultrasonic measurements are discussed in the context of SHM. It was found that while nonlinear ultrasound is sensitive to micro-scale damage, the relative nonlinearity parameter may not always be the best measure to quantify the nonlinearity as it is subject to spurious effects from changes in environmental factors such as loads and temperature.
