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  • Journal article
    Lan B, lowe M, dunne F, 2015,

    A generalized spherical harmonic deconvolution to obtain texture of cubic materials from ultrasonic wave speed

    , Journal of the Mechanics and Physics of Solids, Vol: 83, Pages: 221-242, ISSN: 0022-5096

    In this paper, the spherical harmonic convolution approach for HCP materials (Lan et al., 2015) is extended into a generalised form for the principal purpose of bulk texture determination in cubic polycrystals from ultrasonic wave speed measurements. It is demonstrated that the wave speed function of a general single crystal convolves with the polycrystal Orientation Distribution Function (ODF) to make the resultant polycrystal wave speed function such that when the three functions are expressed in harmonic expansions, the coefficients of any one function may be determined from the coefficients of the other two. All three Euler angles are taken into account in the description of the ODF such that the theorem applies for all general crystal systems.The forward problem of predicting polycrystal wave speed with knowledge of single crystal properties and the ODF is solved for all general cases, with validation carried out on cubic textures showing strong sensitivity to texture and excellent quantitative accuracy in predicted wave speed amplitudes. Importantly, it is also revealed by the theorem that the cubic structure is one of only two crystal systems (the other being HCP) whose orientation distributions can be inversely determined from polycrystal wave velocities by virtue of their respective crystal symmetries. Proof of principle is then established by recovering the ODFs of representative cubic textures solely from the wave velocities generated from a computational model using these texture inputs, and excellent accuracies are achieved in the recovered ODF coefficients as well as the resultant pole figures. Hence the methodology is argued to provide a powerful technique for wave propagation studies and bulk texture measurement in cubic polycrystals and beyond.Keywords Texture; Generalised spherical convolution; Ultrasound; Cubic polycrystals
  • Journal article
    Shi F, Choi W, Lowe MJS, Skelton EA, Craster RVet al., 2015,

    The validity of Kirchhoff theory for scattering of elastic waves from rough surfaces

    , PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, Vol: 471, ISSN: 1364-5021
  • Journal article
    Huthwaite P, Seher M, 2015,

    Robust Helical Path Separation for Thickness Mapping of Pipes by Guided Wave Tomography

    , IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, Vol: 62, Pages: 927-938, ISSN: 1525-8955

    Pipe wall loss caused by corrosion can be quantifiedacross an area by transmitting guided Lamb waves throughthe region and measuring the resulting signals. Typically thedispersive relationship for these waves, which means thatwave velocity is a known function of thickness, is exploited,enabling the wall thickness to be determined from a velocityreconstruction. The accuracy and quality of this reconstructionis commonly limited by the angle of view available from thetransducer arrays. These arrays are often attached as a pairof ring arrays on either side of the inspected region, and dueto the cylindrical nature of the pipe, waves are able to travelin an infinite number of helical paths between any two transducers.The first arrivals can be separated relatively easily bytime gating, but by using just these components the angle ofview is severely restricted. To improve the viewing angle, it isnecessary to separate the wavepackets. This paper provides anoutline of a separation approach: initially the waves are backpropagatedto their source to align the different signals, then afiltering technique is applied to select the desired components.The technique is applied to experimental data and demonstratedto robustly separate the signals
  • 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.
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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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