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• Journal article
  Quintanilla FH, Lowe MJS, Craster RV, 2015,

  Modeling guided elastic waves in generally anisotropic media using a spectral collocation method

  , Journal of the Acoustical Society of America, Vol: 137, Pages: 1180-1194, ISSN: 0001-4966

  Guided waves are now well established for some applications in the non-destructive evaluation of structures and offer potential for deployment in a vast array of other cases. For their development, it is important to have reliable and accurate information about the modes that propagate for particular waveguide structures. Essential information that informs choices of mode transducer, operating frequencies, and interpretation of signals, among other issues, is provided by the dispersion curves of different modes within various combinations of geometries and materials. In this paper a spectral collocation method is successfully used to handle the more complicated and realistic waveguide problems that are required in non-destructive evaluation; many pitfalls and limitations found in root-finding routines based on the partial wave method are overcome by using this approach. The general cases presented cover anisotropic homogeneous perfectly elastic materials in flat and cylindrical geometry. Non-destructive evaluation applications include complex waveguide structures, such as single or multi-layered fiber composites, lined, bonded and buried structures. For this reason, arbitrarily multi-layered systems with both solid and fluid layers are also addressed as well as the implementation of interface models of imperfect boundary conditions between layers.

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• Conference paper
  Shi F, Choi W, Skelton E, Lowe M, Craster Ret al., 2015,

  Investigation of the Validity of the Elastic Kirchhoff Approximation for Rough Cracks Using a Finite Element Approach

  , 41st Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE), Publisher: AMER INST PHYSICS, Pages: 1722-1729, ISSN: 0094-243X
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• Conference paper
  Seher M, Huthwaite P, Lowe M, Cawley Pet al., 2015,

  Experimental Study of A0 Lamb Wave Tomography

  , 41st Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE), Publisher: AMER INST PHYSICS, Pages: 245-253, ISSN: 0094-243X
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  • Citations: 1
• Conference paper
  Liu C, Dobson J, Cawley P, 2015,

  Practical Evaluation of SHM Damage Detection Under Complex Environmental Conditions Using Receiver Operating Characteristics

  , 10th International Workshop on Structural Health Monitoring (IWSHM), Publisher: DESTECH PUBLICATIONS, INC, Pages: 1949-1956
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• Conference paper
  Dobson J, Cawley P, 2015,

  Independent Component Analysis for Improved Defect Detection in Guided Wave

  , 10th International Workshop on Structural Health Monitoring (IWSHM), Publisher: DESTECH PUBLICATIONS, INC, Pages: 1878-1885
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• Conference paper
  Corcoran J, Davies CM, Nagy PB, Cawley Pet al., 2015,

  Potential Drop Strain Measurement for Creep Monitoring

  , 41st Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE), Publisher: AMER INST PHYSICS, Pages: 917-925, ISSN: 0094-243X
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• Conference paper
  Leinov E, Cawley P, Lowe MJS, 2015,

  Guided Wave Attenuation in Pipes Buried in Sand

  , 41st Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE), Publisher: AMER INST PHYSICS, Pages: 227-236, ISSN: 0094-243X
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• Conference paper
  Pettitt JR, Walker A, Lowe MJS, 2015,

  An optimised stiffness reduction method for simulating infinite elastic space using commercial Finite Elements codes

  , 13th Anglo-French Physical Acoustics Conference (AFPAC), Publisher: IOP PUBLISHING LTD, ISSN: 1742-6588
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  • Citations: 1
• Conference paper
  Quintanilla FH, Lowe M, Craster R, 2015,

  Dispersion Curves for Guided Elastic Waves in Multilayered Anisotropic Media Generated with the Spectral Method

  , 41st Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE), Publisher: AMER INST PHYSICS, Pages: 739-745, ISSN: 0094-243X
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  • Citations: 1
• Conference paper
  Huthwaite P, Shi F, Van Pamel A, Lowe MJSet al., 2015,

  High-Speed GPU-Based Finite Element Simulations for NDT

  , 41st Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE), Publisher: AMER INST PHYSICS, Pages: 1815-1819, ISSN: 0094-243X
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  • Citations: 1
• Conference paper
  Pettit JR, Walker AE, Lowe MJS, 2015,

  Modelling NDE Pulse-Echo inspection Of Misorientated Planar Rough Defects Using An Elastic Finite Element Method

  , 41st Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE), Publisher: AMER INST PHYSICS, Pages: 1730-1737, ISSN: 0094-243X
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• Conference paper
  Van Pamel A, Huthwaite P, Brett CR, Lowe MJSet al., 2015,

  A Finite Element Model Investigation of Ultrasonic Array Performance for Inspecting Polycrystalline Materials

  , 41st Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE), Publisher: AMER INST PHYSICS, Pages: 1007-1014, ISSN: 0094-243X
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  • Citations: 1
• Conference paper
  Huthwaite P, Seher M, 2015,

  Helical Path Separation For Guided Wave Tomography

  , 41st Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE), Publisher: AMER INST PHYSICS, Pages: 761-770, ISSN: 0094-243X
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• Conference paper
  Van Pamel A, Brett CR, Lowe MJS, 2015,

  An Initial Investigation into Pseudo-Coloring for Ultrasonic NDE of Polycrystalline Materials

  , 41st Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE), Publisher: AMER INST PHYSICS, Pages: 1031-1036, ISSN: 0094-243X
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  • Citations: 1
• Journal article
  Van Pamel A, Brett CR, Lowe MJS, 2014,

  A Methodology for Evaluating Detection Performance of Ultrasonic Array Imaging Algorithms for Coarse-Grained Materials

  , IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL, Vol: 61, Pages: 2042-2053, ISSN: 0885-3010
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  • Citations: 11
• Journal article
  Shi F, Choi W, Skelton EA, Lowe MJS, Craster RVet al., 2014,

  A Time-Domain Finite Element Boundary Integration Method for Ultrasonic Nondestructive Evaluation

  , IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL, Vol: 61, Pages: 2054-2066, ISSN: 0885-3010
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  • Citations: 6
• Journal article
  Escobar-Ruiz E, Wright DC, Collison IJ, Cawley P, Nagy PBet al., 2014,

  Reflection Phase Measurements for Ultrasonic NDE of Titanium Diffusion Bonds

  , JOURNAL OF NONDESTRUCTIVE EVALUATION, Vol: 33, Pages: 535-546, ISSN: 0195-9298
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  • Citations: 9
• Journal article
  Brierley N, Tippetts T, Cawley P, 2014,

  The computational enhancement of automated non-destructive inspection

  , INSIGHT, Vol: 56, Pages: 599-606, ISSN: 1354-2575
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• Journal article
  Mark AF, Fan Z, Azough F, Lowe MJS, Withers PJet al., 2014,

  Investigation of the elastic/crystallographic anisotropy of welds for improved ultrasonic inspections

  , Materials Characterization, Vol: 98, Pages: 47-53, ISSN: 1873-4189
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• Journal article
  Pettit JR, Walker A, Cawley P, Lowe MJSet al., 2014,

  A stiffness reduction method for efficient absorption of waves at boundaries for use in commercial Finite Element codes

  , Ultrasonics, Vol: 54, Pages: 1868-1879, ISSN: 0041-624X

  Commercially available Finite Element packages are being used increasingly for modelling elastic wave propagation problems. Demand for improved capability has resulted in a drive to maximise the efficiency of the solver whilst maintaining a reliable solution. Modelling waves in unbound elastic media to high levels of accuracy presents a challenge for commercial packages, requiring the removal of unwanted reflections from model boundaries. For time domain explicit solvers, Absorbing Layers by Increasing Damping (ALID) have proven successful because they offer flexible application to modellers and, unlike the Perfectly Matched Layers (PMLs) approach, they are readily implemented in most commercial Finite Element software without requiring access to the source code. However, despite good overall performance, this technique requires the spatial model to extend significantly outside the domain of interest. Here, a Stiffness Reduction Method (SRM) has been developed that operates within a significantly reduced spatial domain. The technique is applied by altering the damping and stiffness matrices of the system, inducing decay of any incident wave. Absorbing region variables are expressed as a function of known model constants, helping to apply the technique to generic elastodynamic problems. The SRM has been shown to perform significantly better than ALID, with results confirmed by both numerical and analytical means.

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