Analysis of Resonant Ultrasound Spectroscopy as a Technique to Evaluate Material Property Changes

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ISBN 13 :
Total Pages : 67 pages
Book Rating : 4.:/5 (12 download)

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Book Synopsis Analysis of Resonant Ultrasound Spectroscopy as a Technique to Evaluate Material Property Changes by : Gautham Manoharan

Download or read book Analysis of Resonant Ultrasound Spectroscopy as a Technique to Evaluate Material Property Changes written by Gautham Manoharan and published by . This book was released on 2017 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this thesis is to validate Resonant Ultrasound Spectroscopy (RUS) as a non-destructive evaluation tool that can be used to study effects of radiation on the mechanical properties of a material, mainly its elastic constants. RUS involves experimentally measuring the resonant frequencies of a sample and calculating the elastic constants based on these measurements. Finite Element Method (FEM) is used to get the frequencies of the modes of free vibration for the sample model. This result depends on the elastic constant values used in the FEM simulation. Studies were conducted to confirm the accuracy of the FEM model, and determine the right configuration and parameters to use for the simulation. Assuming uniform and isotropic elastic property changes, the effects of radiation damage can be quantified by obtaining a set of matching resonant frequencies between the experimental and FEM simulation results, before and after irradiating the sample. This is done by adjusting the elastic constant values used in the simulation so that the results match with the experimentally obtained resonant frequencies. With powerful enough equipment, even real time monitoring is possible in harsh environments, thus pointing out imminent failure.

Developing a Non-destructive Evaluation Technique Using Resonance Ultrasound Spectroscopy for Fission Based Target

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ISBN 13 :
Total Pages : 71 pages
Book Rating : 4.:/5 (97 download)

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Book Synopsis Developing a Non-destructive Evaluation Technique Using Resonance Ultrasound Spectroscopy for Fission Based Target by : Abu Rafi Mohammad Iasir

Download or read book Developing a Non-destructive Evaluation Technique Using Resonance Ultrasound Spectroscopy for Fission Based Target written by Abu Rafi Mohammad Iasir and published by . This book was released on 2015 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this thesis is to study Resonance Ultrasound Spectroscopy(RUS) and it's potential to evaluate the change in interfacial thermal resistance due to irradiation. Resonant Ultrasound Spectroscopy is conventionally used to determine the material properties of elastic bodies. It is a nondestructive technique that is very capable of extracting the elastic constants for a complete anisotropic material. Finite Element Method(FEM) is used to determine the natural frequency of a hollow cylinder. FEM was used due to the shape of the object. An experimental system was developed to capture the resonant frequencies of a hollow cylinder which is similar to Molybdenum-99 target. After successfully determining the resonance frequencies from the spectra, the frequencies were inverted to the elastic constants using the finite element model. Radiation effects on elastic constants was also studied. An investigation was made to assess the usefulness of RUS in evaluating radiation damage of materials. An experimental study was also completed to analyze the differences in RUS spectra in a contact pressure analysis between two cylinders of Molybdenum-99 target.

Resonant Ultrasound Spectroscopy for Elastic Constant Measurements

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ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (685 download)

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Book Synopsis Resonant Ultrasound Spectroscopy for Elastic Constant Measurements by :

Download or read book Resonant Ultrasound Spectroscopy for Elastic Constant Measurements written by and published by . This book was released on 1993 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: All objects exhibit vibrational resonances when mechanically excited. These resonant frequencies are determined by density, geometry, and elastic moduli. Resonant ultrasound spectroscopy (RUS) takes advantage of the known relationship between the parameters. In particular, for a freely suspended object, with three of the four parameters (vibrational spectra, density, geometry, or elastic moduli) known the remaining one can be calculated. From a materials characterization standpoint it is straight-forward to measure density and geometry but less so to measure all the elastic moduli. It has recently become possible to quickly and accurately measure vibrational spectra, and using code written at Los Alamos, calculate all the elastic moduli simultaneously. This is done to an accuracy of better than one percent for compression and 0.1 percent for shear. RUS provides rapid acquisition of materials information here-to-fore obtainable only with difficulty. It will greatly facilitate the use of real materials properties in models and thus make possible more realistic modeling results. The technique is sensitive to phase changes and microstructure. This offers a change to input real data into microstructure and phase change models. It will also enable measurement of moduli at locations in and about a weld thus providing information for a validating coupled thermomechanical calculations.

Resonant Ultrasound Spectroscopy

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Publisher : Wiley-VCH
ISBN 13 :
Total Pages : 224 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Resonant Ultrasound Spectroscopy by : Albert Migliori

Download or read book Resonant Ultrasound Spectroscopy written by Albert Migliori and published by Wiley-VCH. This book was released on 1997-08-14 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: This first procedural guide to RUS, Resonant Ultrasound Spectroscopy offers a clear step-by-step tutorial, from developing a preliminary set of resonances to final determination of moduli. The book also contains intermediate computer outputs showing where mistakes are made, how to spot them, and how to remeasure to correct problems. Also a complete reference to the language of RUS, this book is full of clear explanations of every variable, concept, and hard-to-find term currently in use.

Development of Resonant Ultrasound Spectroscopy for Determination of Material Properties of Solids at High Frequency

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ISBN 13 :
Total Pages : 95 pages
Book Rating : 4.:/5 (713 download)

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Book Synopsis Development of Resonant Ultrasound Spectroscopy for Determination of Material Properties of Solids at High Frequency by : 鄭鴻輝

Download or read book Development of Resonant Ultrasound Spectroscopy for Determination of Material Properties of Solids at High Frequency written by 鄭鴻輝 and published by . This book was released on 2008 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Resonant Ultrasound Spectroscopy for Quality Control of Geometrically Complex Additively Manufactured Components

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (119 download)

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Book Synopsis Resonant Ultrasound Spectroscopy for Quality Control of Geometrically Complex Additively Manufactured Components by : Samantha McGuigan

Download or read book Resonant Ultrasound Spectroscopy for Quality Control of Geometrically Complex Additively Manufactured Components written by Samantha McGuigan and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal additive manufacturing (AM) has started to overshadow traditional manufacturing practices thanks to its ability to produce complex, high-performance and application-customized components. However, AM process parameters have not been optimized, leading to inconsistencies and imperfections such as cracks and pores in parts, as well as deviations from the original design. Nondestructive evaluation (NDE) methods used for part qualification such as x-ray computed tomography (CT) and conventional ultrasonic testing (UT) have limitations in their abilities. X-ray CT is costly, hazardous, and offers limited resolution for larger components while many UT methods have limited applicability for inspection of parts with complex geometries or rough surfaces. Here, we conduct an integrated numerical and experimental study to investigate the feasibility of resonance ultrasound spectroscopy (RUS) as an alternative NDE method to inspect complex AM lattice structures with a varying number of missing struts. The most encouraging results are obtained when test samples have traction-free boundary conditions. The results of numerical simulations including eigenfrequency and frequency domain analyses are promising, indicating that the pristine and defective lattice samples should theoretically be distinguishable. In addition, given a reference intact sample, characterizing the extent of the defect in terms of the number of missing struts appears feasible. We introduce a similarity metric to compare the spectra after being locally normalized. However, the experimental results are not as conclusive. Although pristine and defective lattices may be distinguished for some cases, the number of missing struts cannot be inferred. The discrepancies between the numerical and experimental results are likely due to our simplified assumptions about material properties in numerical simulations and/or the presence of other unaccounted defects and heterogeneities in test samples.

Defect Analysis Using Resonant Ultrasound Spectroscopy

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (69 download)

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Book Synopsis Defect Analysis Using Resonant Ultrasound Spectroscopy by : Kevin Joseph Flynn

Download or read book Defect Analysis Using Resonant Ultrasound Spectroscopy written by Kevin Joseph Flynn and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis demonstrates the practicability of using Resonant Ultrasound Spectroscopy (RUS) in combination with Finite Element Analysis (FEA) to determine the size and location of a defect in a material of known geometry and physical constants. Defects were analyzed by comparing the actual change in frequency spectrum measured by RUS to the change in frequency spectrum calculated using FEA. FEA provides a means of determining acceptance/rejection criteria for Non-Destructive Testing (NDT). If FEA models of the object are analyzed with defects in probable locations; the resulting resonant frequency spectra will match the frequency spectra of actual objects with similar defects. By analyzing many FEA-generated frequency spectra, it is possible to identify patterns in behavior of the resonant frequencies of particular modes based on the nature of the defect (location, size, depth, etc.). Therefore, based on the analysis of sufficient FEA models, it should be possible to determine nature of defects in a particular object from the measured resonant frequency. Experiments were conducted on various materials and geometries comparing resonant frequency spectra measured using RUS to frequency spectra calculated using FEA. Measured frequency spectra matched calculated frequency spectra for steel specimens both before and after introduction of a thin cut. Location and depth of the cut were successfully identified based on comparison of measured to calculated resonant frequencies. However, analysis of steel specimens with thin cracks, and of ceramic specimens with thin cracks, showed significant divergence between measured and calculated frequency spectra. Therefore, it was not possible to predict crack depth or location for these specimens. This thesis demonstrates that RUS in combination with FEA can be used as an NDT method for detection and analysis of cracks in various materials, and for various geometries, but with some limitations. Experimental results verify that cracks can be detected, and their depth and location determined with reasonable accuracy. However, experimental results also indicate that there are limits to the applicability of such a method, the primary one being a lower limit to the size of crack - especially thickness of the crack - for which this method can be applied.

Ultrasonics

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Publisher : CRC Press
ISBN 13 : 1000994953
Total Pages : 904 pages
Book Rating : 4.0/5 (9 download)

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Book Synopsis Ultrasonics by : Dale Ensminger

Download or read book Ultrasonics written by Dale Ensminger and published by CRC Press. This book was released on 2024-02-21 with total page 904 pages. Available in PDF, EPUB and Kindle. Book excerpt: Updated, revised, and restructured to reflect the latest advances in science and applications, the fourth edition of this best-selling industry and research reference covers the fundamental physical acoustics of ultrasonics and transducers, with a focus on piezoelectric and magnetostrictive modalities. It then discusses the full breadth of ultrasonics applications involving low power (sensing) and high power (processing) for research, industrial, and medical use. This book includes new content covering computer modeling used for acoustic and elastic wave phenomena, including scattering, mode conversion, transmission through layered media, Rayleigh and Lamb waves and flexural plates, modern horn design tools, Langevin transducers, and material characterization. There is more attention on process monitoring and advanced nondestructive testing and evaluation (NDT/NDE), including phased array ultrasound (PAUT), long-range inspection, using guided ultrasonic waves (GUW), internally rotary inspection systems (IRIS), time-of-flight diffraction (TOFD), and acoustic emission (AE). These methods are discussed and applied to both metals and nonmetals using illustrations in various industries, including now additionally for food and beverage products. The topics of defect sizing, capabilities, and limitations, including the probability of detection (POD), are introduced. Three chapters provide a new treatment of high-power ultrasonics, for both fluids and solids, and again, with examples of industrial engineering, food and beverage, pharmaceuticals, petrochemicals, and other process applications. Expanded coverage is given to medical and biological applications, covering diagnostics, therapy, and, at the highest powers, surgery. Key Features Provides an overview of fundamental analysis and transducer technologies needed to design and develop both measurement and processing systems Considers applications in material characterization and metrology Covers ultrasonic nondestructive testing and evaluation and high-power ultrasonics, which involves interactions that change the state of material Highlights medical and biomedical applications of ultrasound, focusing on the physical acoustics and the technology employed for diagnosis, therapy, surgery, and research This book is intended for both the undergraduate and graduate scientists and engineers, as well as the working professional, who seeks to understand the fundamentals together with a holistic treatment of the field of ultrasonics and its diversity of applications.

Elastic Properties of Bulk-metallic Glasses Studied by Resonant Ultrasound Spectroscopy

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ISBN 13 :
Total Pages : 125 pages
Book Rating : 4.:/5 (436 download)

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Book Synopsis Elastic Properties of Bulk-metallic Glasses Studied by Resonant Ultrasound Spectroscopy by :

Download or read book Elastic Properties of Bulk-metallic Glasses Studied by Resonant Ultrasound Spectroscopy written by and published by . This book was released on 2008 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: The elastic properties of a solid are of considerable interest to both science and technology. Not only do they contain fundamental information about the nature of the inter-atomic bonding in the material, but they also determine the mechanical behavior of solids. In the past few years, considerable effort has been devoted to the study of elastic properties of bulk metallic glasses (BMGs), a relatively new class of metallic materials that display a unique combination of mechanical and physical properties. Our research has focused on Zr-based, Cu-based and Ca-based metallic glasses. Zr-based BMGs are known to have superior glass forming ability and high strength, but their ductility is too low for wide-spread practical applications. Cu-based BMGs recently received wide interest because of their low cost and good mechanical properties. Ca-based BMGs have low glass transition temperature T[subscript g], around 390 K, which make them very attractive to be studied near T[subscript g]. In this work, resonant ultrasound spectroscopy (RUS) has been applied to study the elastic properties of above mentioned BMGs from 5 K to their glass transition temperature T[subscript g]. RUS is a novel technique for determining the elastic moduli of solids, based on the measurement of the resonances of a freely vibrating body. In an RUS experiment, the mechanical resonances of a freely vibrating solid of known shape are measured, and an iteration procedure is used to "match" the measured lines with the calculated spectrum. This allows determination of all elastic constant of the solid from a single frequency scan. Below T[subscript g], the elastic constants of the BMGs under investigation show "normal" behavior, i.e. with increasing temperature, all moduli decrease and Poisson ratio increases. Above T[subscript g] changes in the trends occur due to structural relaxation and crystallization. We confirmed the suggested link between ductility and Poisson ratio: BMGs showing good ductility display high Poisson ratio. By increasing palladium content in Zr50Cu40-[subscript x]Al10Pd[subscript x] alloys, BMGs with high Poisson ratio and thus good ductility have been obtained. In addition, we developed a simple model to provide fast and good estimate of the temperature dependence of elastic constants of BMGs from room temperature measurements.

Resonant Ultrasound Spectroscopy and Non-destructive Testing

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ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (683 download)

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Book Synopsis Resonant Ultrasound Spectroscopy and Non-destructive Testing by :

Download or read book Resonant Ultrasound Spectroscopy and Non-destructive Testing written by and published by . This book was released on 1995 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of mechanical resonances to test properties of materials is perhaps older than the industrial revolution. Early documented cases of British railroad engineers tapping the wheels of a train and using the sound to detect cracks perhaps mark the first real use of resonances to test the integrity of high-performance alloys. Attempts were made in the following years to understand the resonances of solids mathematically, based on the shape and composition. But Nobel Laureate Lord Rayleigh best summarized the state of affairs in 1894, stating {open_quotes}the problem has, for the most part, resisted attack{close_quotes}. More recently, modern computers and electronics have enabled Anderson and co-workers with their work on minerals, and our work at Los Alamos on new materials and manufactured components to advance the use of resonances to a precision non-destructive testing tool that makes anisotropic modulus measurements, defect detection and geometry error detection routine. The result is that resonances can achieve the highest absolute accuracy for any dynamic modulus measurement technique, can be used on the smallest samples, and can also enable detection of errors in certain classes of precision manufactured components faster and more accurately than any other technique.

Resonant Ultrasound Spectroscopy

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ISBN 13 :
Total Pages : 12 pages
Book Rating : 4.:/5 (684 download)

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Book Synopsis Resonant Ultrasound Spectroscopy by :

Download or read book Resonant Ultrasound Spectroscopy written by and published by . This book was released on 1996 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: A novel nondestructive evaluation method, resonant ultrasound spectroscopy (RUS), is reviewed with an emphasis upon defining the elastic properties of intermetallic phases. The applications and advantages of RUS as compared to other conventional elastic constant measurement methods are explained. RUS has been employed to measure the elastic properties of single crystal and/or polycrystalline intermetallics, such as Laves phases (C15 HfV2 and NbCr2), Nb-modified titanium aluminides, and transition metal disilicides (C11{sub b} MoSi2, C40 NbSi2 and TaSi2). For Laves phases, the elastic properties of HfV2-based C15 phases show various anomalies and those of C15 NbCr2 do not. For Nb-modified titanium aluminides, the elastic properties of O-phase alloys are investigated as a function of alloying content. For transition metal disilicides, single crystal elastic constants of MoSi2, NbSi2, and TaSi2 are obtained and compared. Based on the experimentally determined elastic properties, the characteristics of interatomic bonding in these materials are examined and the possible impact of the elastic properties on mechanical behavior is discussed.

Acoustic Properties of Novel Materials Using Resonant Ultrasound Spectroscopy

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Publisher :
ISBN 13 : 9780542828034
Total Pages : 169 pages
Book Rating : 4.8/5 (28 download)

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Book Synopsis Acoustic Properties of Novel Materials Using Resonant Ultrasound Spectroscopy by : Kenneth A. Pestka

Download or read book Acoustic Properties of Novel Materials Using Resonant Ultrasound Spectroscopy written by Kenneth A. Pestka and published by . This book was released on 2006 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Opportunities in Protection Materials Science and Technology for Future Army Applications

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Publisher : National Academies Press
ISBN 13 : 030921288X
Total Pages : 176 pages
Book Rating : 4.3/5 (92 download)

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Book Synopsis Opportunities in Protection Materials Science and Technology for Future Army Applications by : National Research Council

Download or read book Opportunities in Protection Materials Science and Technology for Future Army Applications written by National Research Council and published by National Academies Press. This book was released on 2011-07-27 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Armor plays a significant role in the protection of warriors. During the course of history, the introduction of new materials and improvements in the materials already used to construct armor has led to better protection and a reduction in the weight of the armor. But even with such advances in materials, the weight of the armor required to manage threats of ever-increasing destructive capability presents a huge challenge. Opportunities in Protection Materials Science and Technology for Future Army Applications explores the current theoretical and experimental understanding of the key issues surrounding protection materials, identifies the major challenges and technical gaps for developing the future generation of lightweight protection materials, and recommends a path forward for their development. It examines multiscale shockwave energy transfer mechanisms and experimental approaches for their characterization over short timescales, as well as multiscale modeling techniques to predict mechanisms for dissipating energy. The report also considers exemplary threats and design philosophy for the three key applications of armor systems: (1) personnel protection, including body armor and helmets, (2) vehicle armor, and (3) transparent armor. Opportunities in Protection Materials Science and Technology for Future Army Applications recommends that the Department of Defense (DoD) establish a defense initiative for protection materials by design (PMD), with associated funding lines for basic and applied research. The PMD initiative should include a combination of computational, experimental, and materials testing, characterization, and processing research conducted by government, industry, and academia.

Resonant Ultrasound Spectroscopy and Differential Scanning Calorimetry Studies of Materials for Property Specific Applications

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Publisher :
ISBN 13 : 9789521506710
Total Pages : 36 pages
Book Rating : 4.5/5 (67 download)

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Book Synopsis Resonant Ultrasound Spectroscopy and Differential Scanning Calorimetry Studies of Materials for Property Specific Applications by : Jyrki Vuorinen

Download or read book Resonant Ultrasound Spectroscopy and Differential Scanning Calorimetry Studies of Materials for Property Specific Applications written by Jyrki Vuorinen and published by . This book was released on 2001 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Magnetic Resonance Elastography

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Publisher : Springer
ISBN 13 : 1493915754
Total Pages : 143 pages
Book Rating : 4.4/5 (939 download)

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Book Synopsis Magnetic Resonance Elastography by : Sudhakar K. Venkatesh

Download or read book Magnetic Resonance Elastography written by Sudhakar K. Venkatesh and published by Springer. This book was released on 2014-10-01 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first book to cover the groundbreaking development and clinical applications of Magnetic Resonance Elastography, this book is essential for all practitioners interested in this revolutionary diagnostic modality. The book is divided into three sections. The first covers the history of MRE. The second covers technique and clinical applications of MRE in the liver with respect to fibrosis, liver masses, and other diseases. Case descriptions are presented to give the reader a hands-on approach. The final section presents the techniques, sequence and preliminary results of applications in other areas of the body including muscle, brain, lung, heart, and breast.

Scientific and Technical Aerospace Reports

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ISBN 13 :
Total Pages : 652 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis Scientific and Technical Aerospace Reports by :

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Programmatic EIS for Stockpile Stewardship and Management

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ISBN 13 :
Total Pages : 238 pages
Book Rating : 4.3/5 (555 download)

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Book Synopsis Programmatic EIS for Stockpile Stewardship and Management by :

Download or read book Programmatic EIS for Stockpile Stewardship and Management written by and published by . This book was released on 1996 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: