Phase Velocity Method for Guided Wave Measurements in Composite Plates

Moreno, E.; Galarza, Nekane; Rubio, B.; Otero, José A.

doi:10.1016/j.phpro.2015.03.009

Cited by 6 publications

(17 citation statements)

References 8 publications

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“…Draudviliene et al [31] measured phase velocity using the Phase Velocity Method (PVM) with an adapted zero-crossing ToF, which uses several zero crossing instants in the signal with delay time measurement. Moreno et al [32] demonstrated the usefulness of PVM to measure phase velocity based on time-distance measurements on a constant phase point of a pulse. However, this technique has significant measurement uncertainty for a high dispersive guided wave mode with viscoelasticity.…”

Section: Introductionmentioning

confidence: 99%

Phase velocity measurement of dispersive wave modes by Gaussian peak-tracing in the f-k transform domain

Ghose

Panda

Balasubramaniam

2021

Meas. Sci. Technol.

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The measurement of guided wave phase velocity is vital for the successful implementation of the guided wave technique for defect detection and material characterization. In this paper, an algorithm for quantitative phase velocity measurement based on f-k (frequency-wavenumber) transformation with a Gaussian fit peak-tracing is proposed. The versatility of the algorithm is demonstrated using numerically simulated data for a wide range of case studies, including non-dispersive, dispersive, dispersive with viscoelasticity, overlapping modes, and highly attenuative materials. It is further validated utilizing two experimental datasets. The maximum error in measuring phase velocity using experimental and numerical data is less than 0.8% when compared to the analytical value obtained using DISPERSE. The phase velocity values obtained with the proposed f-k transformation with a Gaussian fit peak-tracing algorithm are also compared with the conventional methods and found to be superior. Further, the proposed algorithm is suitable for evaluating the phase velocity of the coexistence of forward and reflected wave modes. Hence, the proposed algorithm is appropriate for measuring phase velocity where separation of modes or reflected signal is difficult to achieve, such as for a smaller specimen or even longer specimens with higher-order faster mode.

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Section: Introductionmentioning

confidence: 99%

Phase velocity measurement of dispersive wave modes by Gaussian peak-tracing in the f-k transform domain

Ghose

Panda

Balasubramaniam

2021

Meas. Sci. Technol.

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“…sample orientations) and therefore can provide all the components of the stiffness tensor and accordingly a complete anisotropic damage evaluation of the tested sample. This method was also extended for use with guided waves in several studies because of their established advantages [11,12]. In the industry one normally do not require full understanding of all physical phenomena involved but rather seek practical and workable techniques that are reliable.…”

Section: Introductionmentioning

confidence: 99%

Damage Evaluation in Woven Glass Reinforced Polyamide 6.6/6 Composites Using Ultrasound Phase-Shift Analysis and X-ray Tomography

et al. 2018

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The paper proposes a new experimental methodology, based on ultrasonic measurements, that aims at evaluating the anisotropic damage in woven semi-crystalline polymer composites through new damage indicators. Due to their microstructure, woven composite materials are characterized by an anisotropic evolution of damage induced by different damage mechanisms occurring at the micro or mesoscopic scales. In this work, these damage modes in polyamide 6.6/6-woven glass fiber reinforced composites have been investigated qualitatively and quantitatively by X-ray micro-computed tomography (mCT) analysis on composite samples cut according to two orientations with respect to the mold flow direction. Composite samples are initially damaged at different levels during preliminary interrupted tensile tests. Ultrasonic investigations using C-scan imaging have been carried out without yielding significant results. Consequently, an ultrasonic method for stiffness constants estimation based on the bulk and guided wave velocity measurements is applied. Two damage indicators are then proposed. The first consists in calculating the Frobenius norm of the obtained stiffness matrix. The second is computed using the phase shift between two ultrasonic signals respectively measured on the tested samples and an undamaged reference sample. Both X-ray mCT and ultrasonic investigations show a higher damage evolution with respect to the applied stress for the samples oriented at 45 • from the warp direction compared to the samples in the 0 • configuration. The evolution of the second ultrasonic damage indicator exhibits a good correlation with the void volume fraction evolution estimated by mCT as well as with the damage calculated using the measured elastic modulus reduction. The merit of this research is of importance for the automotive industry.

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“…The challenge is identifying which part corresponds to the ALW necessary for the conforming of the C-Scan image. For this purpose, the PVM was used [7]. modulus = 0.9 × 10 8 Pa, and Poisson's ratio = 0.33.…”

Section: Phase Velocity Methods (Pvm)mentioning

confidence: 99%

“…Figure 1 shows the results of an example of dispersion curves for a CFRP plate with a thickness of 5 mm using the values of elastic constants obtained from a previous paper [7] (Table 1). As it is well known, these curves do not consider either excitation or pulse propagation.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Non-Contact Air-Coupled Technique for the Assessment of Composite Sandwich Plates Using Antisymmetric Lamb Waves

Moreno,

Giacchetta,

Gonzalez

et al. 2023

NDT

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This paper describes the design and implementation of an ultrasonic non-contact air-coupled technique (UNCACT) using antisymmetric Lamb waves (ALW) for NDT assessments in novel composite sandwich plates of a car body shell. This technique is complemented with a C-Scan image implementation using guided waves. The finite element method (FEM) was developed using Comsol 6.1 for the interpretation of the several wave modes presented in the experiments, including the ALW mode. This FEM model is indispensable for the correct interpretation of the received signals and contributes to a better implementation of this technology. This is a novel contribution building upon previously reported work. Additionally, the phase velocity method (PVM) was applied for the verification of the ALW mode in the portion of the RF signal necessary for the C-Scan image.

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Phase Velocity Method for Guided Wave Measurements in Composite Plates

Cited by 6 publications

References 8 publications

Phase velocity measurement of dispersive wave modes by Gaussian peak-tracing in the f-k transform domain

Phase velocity measurement of dispersive wave modes by Gaussian peak-tracing in the f-k transform domain

Damage Evaluation in Woven Glass Reinforced Polyamide 6.6/6 Composites Using Ultrasound Phase-Shift Analysis and X-ray Tomography

Ultrasonic Non-Contact Air-Coupled Technique for the Assessment of Composite Sandwich Plates Using Antisymmetric Lamb Waves

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