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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
  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: 7
• 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: 10
• 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
  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
  Gajdacsi A, Jarvis AJC, Huthwaite P, Cegla FBet al., 2014,

  Reconstruction of Temperature Distribution in a Steel Block Using an Ultrasonic Sensor Array

  , Journal of Nondestructive Evaluation, Vol: 33, Pages: 458-470, ISSN: 1573-4862

  Permanently installed ultrasonic sensors have thecapability of measuring much smaller changes in the signalthan conventional sensors that are used for ultrasonic inspections.This is because uncertainties associated with couplingfluids and positional offsets are eliminated. Therefore it ispotentially possible to monitor the onset of material degradation.A particular degradation mechanism that we are keento monitor is high temperature hydrogen attack; where theamount of damage is linked to a drop in ultrasonic velocitywhich we hope can be monitored for with an ultrasonic array.The changes introduced in the ultrasonic propagation velocityare expected to be of the order of 1 % and in practice theyare observable only from a very limited field of view (i.e. fromthe outside of a pipe) and therefore the reconstruction is challengingto accomplish. In order to explore the feasibility ofthis, we are investigating the reconstruction of a non-uniformtemperature distribution which allows us to quickly evaluatethe sensitivity of our method to small spatial variations inultrasonic velocity of the material. Two reconstruction algorithmswere implemented and their performance comparedin simulated and real measurements. The results of the testswere encouraging: local temperature differences as low as10 ◦C could be detected, which corresponds to a local propagationvelocity change of 5 m/s (0.15 % relative velocitychange).

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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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