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Scattering of longitudinal elastic waves from a distribution of cracksLittles, Jerrol W., Jr. 08 1900 (has links)
No description available.
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FE-PML Modeling of Guided Elastic Waves and its Applications to Ultrasonic NDEMahmoud, Abdel-Rahman 10 September 2010 (has links)
This thesis investigates the use of a combined finite element and perfectly matched layer approach in modeling guided elastic wave motion in infinite plates and cylinders and its potential applications to non-destructive evaluation. Underlying principles of the per-fectly-matched, absorbing layer are demonstrated on one-dimensional wave propagation in a semi-infinite elastic rod.
Feasibility of using the perfectly matched layer as absorbing boundary condition in the finite-element modeling of guided elastic wave propagation and scattering is studied for the canonical problem of shear horizontal wave motion in isotropic plates. Numerical re-sults in this study are validated against exact analytical solutions. Excellent agreement has motivated the endeavour to take the technique to the next level of pressure, shear-vertical wave motion in isotropic and transversely isotropic plates.
Time-domain, finite-element formulation of the perfectly matched layer for pressure, shear-vertical wave motion was validated through comparisons with semi-analytical lit-erature data and reciprocity checks. Numerical implementation of the model was em-ployed in studying the effect of crack presence on the time of arrival in a pitch-catch, non-destructive inspection arrangement. Predictions made confirmed previously-reported experimental findings.
Extensions into three-dimensional, Cartesian and cylindrical spaces were validated against reported data. Practical examples of wave scattering in damaged concrete beams, oil and gas pipelines, and composite shells demonstrated the potential use of the proposed model in simulating elastic-wave based non-destructive inspection. Up to 80 % of the computational time needed to run an extended-mesh, finite-element model can be saved by introducing the perfectly-matched, absorbing layer to the finite-element model as the current thesis proposes. This significant saving in computational time by the proposed FE-PML model can accelerate the production of artificial neural network training data or help tackle complicated non-destructive testing applications.
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FE-PML Modeling of Guided Elastic Waves and its Applications to Ultrasonic NDEMahmoud, Abdel-Rahman 10 September 2010 (has links)
This thesis investigates the use of a combined finite element and perfectly matched layer approach in modeling guided elastic wave motion in infinite plates and cylinders and its potential applications to non-destructive evaluation. Underlying principles of the per-fectly-matched, absorbing layer are demonstrated on one-dimensional wave propagation in a semi-infinite elastic rod.
Feasibility of using the perfectly matched layer as absorbing boundary condition in the finite-element modeling of guided elastic wave propagation and scattering is studied for the canonical problem of shear horizontal wave motion in isotropic plates. Numerical re-sults in this study are validated against exact analytical solutions. Excellent agreement has motivated the endeavour to take the technique to the next level of pressure, shear-vertical wave motion in isotropic and transversely isotropic plates.
Time-domain, finite-element formulation of the perfectly matched layer for pressure, shear-vertical wave motion was validated through comparisons with semi-analytical lit-erature data and reciprocity checks. Numerical implementation of the model was em-ployed in studying the effect of crack presence on the time of arrival in a pitch-catch, non-destructive inspection arrangement. Predictions made confirmed previously-reported experimental findings.
Extensions into three-dimensional, Cartesian and cylindrical spaces were validated against reported data. Practical examples of wave scattering in damaged concrete beams, oil and gas pipelines, and composite shells demonstrated the potential use of the proposed model in simulating elastic-wave based non-destructive inspection. Up to 80 % of the computational time needed to run an extended-mesh, finite-element model can be saved by introducing the perfectly-matched, absorbing layer to the finite-element model as the current thesis proposes. This significant saving in computational time by the proposed FE-PML model can accelerate the production of artificial neural network training data or help tackle complicated non-destructive testing applications.
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Mathematical aspects of wave theory for inhomogeneous materials /Larsson, Ashley Ian. January 1991 (has links) (PDF)
Thesis (Ph. D.)--University of Adelaide, Dept. of Applied Mathematics, 1991. / Includes bibliographical references (leaves 135-151).
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Elastic guided wave dispersion in layered piezoelectric plates application to ultrasound transducers and acoustic sensors /Cortes Correales, Daniel H. January 2009 (has links)
Thesis (Ph. D.)--West Virginia University, 2009. / Title from document title page. Document formatted into pages; contains vi, 84 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 79-84).
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Effects of anisotropy and lateral heterogeneities on elastic waves and mode coupling in shallow water /Park, Minkyu. January 1997 (has links)
Thesis (Ph. D.)--University of Washington, 1997. / Vita. Includes bibliographical references (leaves [156]-165).
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Diffuse ultrasonic scattering in heterogeneous mediaGhoshal, Goutam. January 2008 (has links)
Thesis (Ph.D.)--University of Nebraska-Lincoln, 2008. / Title from title screen (site viewed Jan. 13, 2009). PDF text: x, 131 p. : col. ill. ; 3 Mb. UMI publication number: AAT 3315884. Includes bibliographical references. Also available in microfilm and microfiche formats.
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Computational methods for a class of problems in acoustic, elastic and water wavesXu, Liwei. January 2009 (has links)
Thesis (Ph.D.)--University of Delaware, 2009. / Principal faculty advisor: George C. Hsiao, Dept. of Mathematical Sciences. Includes bibliographical references.
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Elastic waves guided by isotropic layers.Sun, Heng. January 1970 (has links)
No description available.
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Finite Element Eigenfunction Method (FEEM) for elastic wave scattering problems /Su, Jen-Houne H. January 1982 (has links)
No description available.
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