Global-Local model for guided wave scattering problems with application to defect characterization in built-up composite structures

Although many imaging algorithms such as ellipse and hyperbola algorithm can roughly locate defects in large plate-like structures with sparse guided wave arrays, quantitative characterization of them is still a challenging problem, especially for those small defects known as subwavelength defects. Scattering signals of defects contain abundant information so that can be used to evaluate defects. A defects recognition method using the S-matrix (scattering matrix) was presented. S-matrices of hole and crack with S0 mode incident were experimentally measured. The results show that defects can be recognized from the morphology of 2D S-matrix chart. This method has great potential to achieve more specific parameters of small defects with sparse guided wave arrays.

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Improved global-local model to predict guided-wave scattering patterns from discontinuities in complex parts

Health Monitoring of Structural and Biological Systems XIII ◽

10.1117/12.2514082 ◽

2019 ◽

Cited By ~ 2

Author(s):

Antonino Spada ◽

Margherita Capriotti ◽

Ranting Cui ◽

Francesco Lanza di Scalea

Keyword(s):

Wave Scattering ◽

Guided Wave ◽

Local Model ◽

Complex Parts

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Ultrasonic guided wave scattering due to delamination in curved composite structures

Composite Structures ◽

10.1016/j.compstruct.2020.111987 ◽

2020 ◽

Vol 239 ◽

pp. 111987 ◽

Cited By ~ 3

Author(s):

Rajendra Kumar Munian ◽

D. Roy Mahapatra ◽

S. Gopalakrishnan

Keyword(s):

Wave Scattering ◽

Composite Structures ◽

Guided Wave ◽

Ultrasonic Guided Wave

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Ultrasonic Guided Wave Scattering Matrices and Tomography Using Sparse Arrays for Defect Characterization

2017 International Conference on Sensing, Diagnostics, Prognostics, and Control (SDPC) ◽

10.1109/sdpc.2017.136 ◽

2017 ◽

Author(s):

Xiang Li ◽

Wei Guo ◽

Xunbo Li ◽

Zhiyong Zhang ◽

Yejia Liu

Keyword(s):

Wave Scattering ◽

Guided Wave ◽

Defect Characterization ◽

Sparse Arrays ◽

Ultrasonic Guided Wave ◽

Scattering Matrices

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3D Finite Element Modeling of Absorbing Regions for Guided Wave Scattering Problems in Composite Materials

Bulletin de la Société géologique de France ◽

10.5176/2251-3701_2.1.61 ◽

2013 ◽

Vol 2 (1) ◽

Author(s):

Ching-Tai Ng

Keyword(s):

Finite Element ◽

Composite Materials ◽

Finite Element Modeling ◽

Wave Scattering ◽

Guided Wave ◽

Scattering Problems ◽

3D Finite Element ◽

Element Modeling ◽

3D Finite Element Modeling

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Probability-based diagnostic imaging with corrected weight distribution for damage detection of stiffened composite panel

Structural Health Monitoring ◽

10.1177/14759217211033967 ◽

2021 ◽

pp. 147592172110339

Author(s):

Guoqiang Liu ◽

Binwen Wang ◽

Li Wang ◽

Yu Yang ◽

Xiaguang Wang

Keyword(s):

Distribution Function ◽

Diagnostic Imaging ◽

Weight Distribution ◽

Composite Structures ◽

Damage Identification ◽

Guided Wave ◽

Composite Panel ◽

Damage Localization ◽

Localization Accuracy ◽

Direct Interpretation

Due to no requirement for direct interpretation of the guided wave signal, probability-based diagnostic imaging (PDI) algorithm is especially suitable for damage identification of complex composite structures. However, the weight distribution function of PDI algorithm is relatively inaccurate. It can reduce the damage localization accuracy. In order to improve the damage localization accuracy, an improved PDI algorithm is proposed. In the proposed algorithm, the weight distribution function is corrected by the acquired relative distances from defects to all actuator–sensor pairs and the reduction of the weight distribution areas. The validity of the proposed algorithm is assessed by identifying damages at different locations on a stiffened composite panel. The results show that the proposed algorithm can identify damage of a stiffened composite panel accurately.

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Lamb Wave Scattering Analysis for Interface Damage Detection between a Surface-Mounted Block and Elastic Plate

Sensors ◽

10.3390/s21030860 ◽

2021 ◽

Vol 21 (3) ◽

pp. 860

Author(s):

Mikhail V. Golub ◽

Alisa N. Shpak ◽

Inka Mueller ◽

Sergey I. Fomenko ◽

Claus-Peter Fritzen

Keyword(s):

Damage Detection ◽

Elastic Plate ◽

Lamb Wave ◽

Wave Scattering ◽

Hybrid Approach ◽

Guided Wave ◽

Open Crack ◽

Damage Indices ◽

Impulse Function ◽

Thin Walled

Since stringers are often applied in engineering constructions to improve thin-walled structures’ strength, methods for damage detection at the joints between the stringer and the thin-walled structure are necessary. A 2D mathematical model was employed to simulate Lamb wave excitation and sensing via rectangular piezoelectric-wafer active transducers mounted on the surface of an elastic plate with rectangular surface-bonded obstacles (stiffeners) with interface defects. The results of a 2D simulation using the finite element method and the semi-analytical hybrid approach were validated experimentally using laser Doppler vibrometry for fully bonded and semi-debonded rectangular obstacles. A numerical analysis of fundamental Lamb wave scattering via rectangular stiffeners in different bonding states is presented. Two kinds of interfacial defects between the stiffener and the plate are considered: the partial degradation of the adhesive at the interface and an open crack. Damage indices calculated using the data obtained from a sensor are analyzed numerically. The choice of an input impulse function applied at the piezoelectric actuator is discussed from the perspective of the development of guided-wave-based structural health monitoring techniques for damage detection.

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