Journal ArticleDOI
Defect detection using ultrasonic arrays: The multi-mode total focusing method
TLDR
In this article, a general imaging methodology, termed multi-mode total focusing method, is proposed in which any combination of modes and reflections can be used to produce an image of the test structure.Abstract:
Ultrasonic arrays allow a given scatterer to be illuminated from a wide range of angles and hence are capable of extracting significant information about the scatterer. In this paper a general imaging methodology, termed multi-mode total focusing method, is proposed in which any combination of modes and reflections can be used to produce an image of the test structure. Like the total focusing method, this approach is implemented by post-processing the full matrix of array data to achieve a synthetic focus at every pixel in the image. A hybrid model is used to predict the array data and demonstrate the performance of the multi-mode imaging concept. This hybrid model combines far field scattering coefficient matrices with a ray-based wave propagation model. This allows the inclusion of longitudinal waves, shear waves and wave mode conversions. It is shown that, with prior knowledge of likely scatterer location and orientation, the mode combination and array location can be optimised to maximise the performance of array inspections. A practically relevant weld inspection application is then described and its optimisation is discussed.read more
Citations
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Journal ArticleDOI
Acousto-ultrasonics-based fatigue damage characterization: Linear versus nonlinear signal features
TL;DR: In this article, a hybrid approach for characterizing fatigue damage was developed, using two genres of damage indices constructed based on the linear and the nonlinear features of acousto-ultrasonic waves.
Journal ArticleDOI
Plane Wave Imaging for ultrasonic non-destructive testing: Generalization to multimodal imaging
TL;DR: This paper describes a new ultrasonic array imaging method for Non-Destructive Testing (NDT) which is derived from the medical Plane Wave Imaging (PWI) technique, and is compared to the Total Focusing Method (TFM), which is the reference imaging technique in NDT.
Journal ArticleDOI
Sizing of flaws using ultrasonic bulk wave testing: A review
Maria V. Felice,Zheng Fan +1 more
TL;DR: Techniques that utilise ultrasonic bulk waves to size flaws, including amplitude, temporal, imaging and inversion, are reviewed.
Journal ArticleDOI
Locating fatigue damage using temporal signal features of nonlinear Lamb waves
TL;DR: In this paper, the authors extended the use of temporal signal processing to the realm of nonlinear Lamb waves, so as to reap the high sensitivity of Lamb wave to small-scale damage (e.g., fatigue cracks), and the efficacy of temporal signals processing in locating damage.
Journal ArticleDOI
Combined analytical FEM approach for efficient simulation of Lamb wave damage detection.
Yanfeng Shen,Victor Giurgiutiu +1 more
TL;DR: CAFA predictions compared well with full scale multi-physics FEM simulations and experiments with scanning laser Doppler vibrometry (SLDV), while achieving remarkable performance in computational efficiency and computer resource saving compared with conventional FEM.
References
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Book
Ultrasonic Testing of Materials
TL;DR: In this article, the authors describe the physical fundamentals of ultrasonics and materials up to the most sophisticated methods for nondestructive testing of solid material using ultrasonic waves for defects such as cavities, nonbonding, and strength variations.
Patent
Ultrasonic testing of materials
TL;DR: An ultrasonic apparatus for testing a material comprises an oscillator (10) which generates a selected frequency in the ultrasonic range, and a transducer (1) is connected to the oscillator for applying an ultrasonic signal to the material and for receiving an echo signal back from the material.
Book
Seismic waves and sources
Ari Ben-Menahem,Sarva Jit Singh +1 more
TL;DR: In this article, the authors proposed a two-dimensional approximation of the Navier Equation with respect to the velocity of the wave in the plane of the plane and the velocity at the liquid-solid interface.
Journal ArticleDOI
Ultrasonic arrays for non-destructive evaluation: A review
TL;DR: The use of ultrasonic arrays for non-destructive evaluation has been extensively studied in the literature as mentioned in this paper, where the main advantages of arrays are their increased flexibility over traditional single element transducers, and their ability to produce immediate images of the test structure.
Journal ArticleDOI
Post-processing of the full matrix of ultrasonic transmit-receive array data for non-destructive evaluation
TL;DR: This paper describes an alternative approach in which the full matrix of time domain signals from every transmitter–receiver pair is captured and post-processed and shown to offer significant performance advantages for NDE.