High resolution ply-by-ply ultrasound imaging of impact damage in thick CFRP laminates by high-frequency acoustic microscopy

Morokov, Egor; Levin, V. M.; Чернов, А. В.; Shanygin, A. N.

doi:10.1016/j.compstruct.2020.113102

Cited by 25 publications

(16 citation statements)

References 60 publications

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“…Description of the microscope was given in the work. [6,8] Here acoustic lens with working frequency of 100 MHz and angle aperture of 11°was applied; the lens provided lateral resolution of 35-40 μm in the composite volume. We used the step-by-step methodology, which included ultrasound imaging of laminate specimen under various driven deformations.…”

Section: Experimental Equipmentmentioning

confidence: 99%

“…Today, only methods based on ultrasound and X‐ray radiation could provide sufficient resolution for observing delamination, matrix cracking and fiber fracture in the CFRP volume. [ 1–7 ]…”

Section: Introductionmentioning

confidence: 99%

“…Today, only methods based on ultrasound and X-ray radiation could provide sufficient resolution for observing delamination, matrix cracking and fiber fracture in the CFRP volume. [1][2][3][4][5][6][7] Nevertheless, the monitoring of the fracture process in the volume of composite under tensile loading in real time is still actual task and is unsolved for thick multilayer laminates. The problem lies in the features of the visualization methods.…”

Section: Introductionmentioning

confidence: 99%

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High‐Resolution Ultrasonic Visualization of the Micromechanical Behavior of Reinforced Composites with Fine Fiber Microstructure

Morokov

Levin

2022

Macromolecular Symposia

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In the work, the first results of in situ ultrasound observation of microstructure changes in the volume of carbon fiber reinforced composites under tension are presented. The results depict the mechanical behavior of the laminate with stacking sequences of [−45°/0°/+45°/90°/+45°/0°/−45°]. Ultrasound visualization of volume microstructure is carried out with a controlled stepwise increase in deformation of the loaded specimens. Data of ultrasound investigation are compared with optical microphotograph and strain-stress curves of controlled and tested specimens. This approach makes it possible to visualize in dynamics the processes of appearance, growth, and transformation of microstructural damages in the volume with a resolution of tenth microns.

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Section: Experimental Equipmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High‐Resolution Ultrasonic Visualization of the Micromechanical Behavior of Reinforced Composites with Fine Fiber Microstructure

Morokov

Levin

2022

Macromolecular Symposia

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“…A major advantage of using UT is that it is highly sensitive to the multilayered structure and various damage types commonly found in composites [23]. High-frequency ultrasound can be utilized for the characterization of sub-surface damage with a high spatial and temporal resolution [24,25,26]. As the thickness and the number of plies increases, the attenuation of high-frequency ultrasound becomes a concern, especially for high damping fiberreinforced composites [27].…”

Section: Introductionmentioning

confidence: 99%

“…As the thickness and the number of plies increases, the attenuation of high-frequency ultrasound becomes a concern, especially for high damping fiberreinforced composites [27]. A recent study reported the inspection of an impacted CFRP laminate using 50 MHz ultrasound and demonstrated a depth probing as deep as 2-2.5 mm [24]. Alternatively, one could lower the ultrasound frequency in order to increase the dynamic depth range, but this is at the expense of the depth resolution.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of ultrasonic techniques for reconstructing the multilayer structure of composites

Yang

Verboven

et al. 2021

NDT & E International

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Prediction of Residual Strains Due to In-Plane Fibre Waviness in Defective Carbon-Fibre Reinforced Polymers Using Ultrasound Data

Patterson

Wang

et al. 2022

J Nondestruct Eval

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Residual strains affect the properties and performance of composite components, therefore measuring and predicting them are important. The prediction of residual strains from a model can be achieved by two steps: the generation of a geometric ply map and the modelling based on that to predict 3D residual strains. A novel method for identifying the most effective algorithm for characterising fibre orientation for the geometric ply map using ultrasound C-scan data has been developed. Finite element models were generated based on the fibre-orientation data from three different algorithms: the Radon transform, 2D fast Fourier transform, and Sobel filter. The models were used to predict residual strains due to three different severities of in-plane fibre waviness induced in a set of 18 specimens. Stratified leave-one-out cross validation was applied to obtain optimum parameters for the three characterisation algorithms and to update the values of the coefficient of thermal expansion for the material. Residual strains on the surface of the specimens were obtained from calculations based on the out-of-plane displacements measured using a digital image correlation system. The predicted and measured residual strain maps were decomposed into feature vectors using orthogonal polynomials to reduce data dimensionality and make quantitative comparisons. The measured residual strains and the predictions based on models using optimised parameters showed good agreement. The differences in performance were quantified based on the accuracy of the predicted residual strains, which showed that the Radon transform performed best.

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High resolution ply-by-ply ultrasound imaging of impact damage in thick CFRP laminates by high-frequency acoustic microscopy

Cited by 25 publications

References 60 publications

High‐Resolution Ultrasonic Visualization of the Micromechanical Behavior of Reinforced Composites with Fine Fiber Microstructure

High‐Resolution Ultrasonic Visualization of the Micromechanical Behavior of Reinforced Composites with Fine Fiber Microstructure

Comparative study of ultrasonic techniques for reconstructing the multilayer structure of composites

Prediction of Residual Strains Due to In-Plane Fibre Waviness in Defective Carbon-Fibre Reinforced Polymers Using Ultrasound Data

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