Resonant Ultrasound Spectroscopy and Differential Scanning Calorimetry Studies of Materials for Property Specific Applications PDF Download
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Author: Jyrki Vuorinen
Publisher:
ISBN: 9789521506710
Category :
Languages : en
Pages : 36
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Author: Jyrki Vuorinen
Publisher:
ISBN: 9789521506710
Category :
Languages : en
Pages : 36
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Author: Gautham Manoharan
Publisher:
ISBN:
Category :
Languages : en
Pages : 67
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Book Description
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.
Author:
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 3110595990
Category : Science
Languages : en
Pages : 146
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Book Description
Zeitschrift für Kristallographie. Supplement Volume 38 presents the complete Abstracts of all contributions to the 26th Annual Conference of the German Crystallographic Society in Essen (Germany) 2018: - Plenary Talks - Microsymposia - Poster Session Supplement Series of Zeitschrift für Kristallographie publishes Abstracts of international conferences on the interdisciplinary field of crystallography.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 5
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Author: Kenneth A. Pestka
Publisher:
ISBN: 9780542828034
Category :
Languages : en
Pages : 169
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Author:
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 3110547155
Category : Science
Languages : en
Pages : 146
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Book Description
Zeitschrift für Kristallographie. Supplement Volume 37 presents the complete Abstracts of all contributions to the 25th Annual Conference of the German Crystallographic Society in Karlsruhe (Germany) 2017: - Plenary Talks - Microsymposia - Poster Session Supplement Series of Zeitschrift für Kristallographie publishes Abstracts of international conferences on the interdisciplinary field of crystallography.
Author: Robert G. Leisure
Publisher:
ISBN: 9781108228251
Category : Condensed matter
Languages : en
Pages : 250
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Book Description
Ultrasonic spectroscopy is a technique widely used in solid-state physics, materials science, and geology that utilizes acoustic waves to determine fundamental physical properties of materials, such as their elasticity and mechanical energy dissipation. This book provides complete coverage of the main issues relevant to the design, analysis, and interpretation of ultrasonic experiments. Topics including elasticity, acoustic waves in solids, ultrasonic loss, and the relation of elastic constants to thermodynamic potentials are covered in depth. Modern techniques and experimental methods including resonant ultrasound spectroscopy, digital pulse-echo, and picosecond ultrasound are also introduced and reviewed. This self-contained book includes extensive background theory and is accessible to students new to the field of ultrasonic spectroscopy, as well as to graduate students and researchers in physics, engineering, materials science, and geophysics.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Resonant Ultrasound Spectroscopy (RUS) has been used successfully to determine the elastic properties of single crystal and homogeneous materials. We have attempted to answer the following question. Under what conditions is RUS a useful tool for determining the moduli of macroscopic, inhomogeneous samples. We concentrated on identifying a sample geometry that will maximize success with RUS. The work consisted of numerical modeling of sample resonances under varying conditions, and empirical testing of rock samples. Numerical modeling and empirical testing indicate that RUS is a viable technique for characterizing the average isotropic elastic moduli of inhomogeneous materials, although larger RMS errors can be expected than for single crystal materials. Success with RUS can optimized by ensuring that the sample size is large compared to the scale of inhomogeneity and by using a high aspect ratio parallelepiped sample.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Resonant Ultrasound Spectroscopy (RUS) is a simple technique for measuring the second-order elastic constants and ultrasonic attenuation of solids. The technique is based on measuring the spectrum of mechanical resonances for a sample of known shape (usually a sphere, cylinder, or parallelepiped). This spectrum cannot be deconvoluted to deduce the elastic constants. Instead, an approximate spectrum is calculated from the known sample dimensions, its mass, and a set of 'guessed' elastic constants. A multidimensional minimization of the rms difference between the measured and calculated spectra enables us to deduce all the elastic constants of the solid from a single frequency scan. Currently, the technique can be applied to crystals of orthorhombic symmetry (9 elastic constants) or higher using desktop computers and software developed for this purpose. Composite materials, especially fiber composites, can take full advantage of the RUS technique as they typically have low symmetry. In this paper we summarize the RUS technique and provide examples of its application to the elastic characterization of both fiber reinforced MMC's, and fiber reinforced PMC's.
Author: 鄭鴻輝
Publisher:
ISBN:
Category :
Languages : en
Pages : 95
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Book Description
