Scattering of the Fundamental Anti-symmetric Lamb Wave by a Mid-plane Edge Delamination in a Fiber-composite Laminate

Chiu, Wing Kong; Rose, L. R. F.; Nadarajah, Nithurshan

doi:10.1016/j.proeng.2017.04.490

Cited by 23 publications

(13 citation statements)

References 15 publications

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“…These considerations can be employed for the characterization of delamination damage in SHM applications. In quasi-isotropic composite laminates, the fiber steering effects in the outermost plies have a significant influence on the scattering pattern [21,10], which is in agreement with the results presented in [16]. Whilst there are several numerical studies focused on A0 mode scattering at delaminations in composite laminates, limited experimental studies have been performed.…”

Section: Introductionsupporting

confidence: 86%

Guided wave propagation and scattering at composite delaminations

Hervin

Fromme

2021

Health Monitoring of Structural and Biological Systems XV

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Composite structures, consisting of highly anisotropic layers of polymer matrix reinforced with high strength carbon fibers, are widely used for aerospace applications due to their low weight and high strength. However, impact during aircraft operation can lead to barely visible and difficult to detect damage. Depending on impact severity, delaminations can occur that reduce the structural integrity and load carrying capacity. Efficient structural health monitoring (SHM) of composite panels can be achieved using guided ultrasonic waves propagating along the structure. Guided ultrasonic wave propagation and scattering at circular delaminations was modelled using full three-dimensional (3D) Finite Element (FE) simulations in ABAQUS. Individual ply layers were modelled using unidirectional composite material properties to accurately capture the anisotropy effects. The guided ultrasonic wave propagation and scattered field at an artificial delamination was measured using a noncontact laser interferometer and quantified. Good agreement between experiments and Finite Element predictions was found and the energy trapping on top of a shallow delamination was verified. The influence of delamination shape and depth was investigated from a FE parameter study. The sensitivity of guided waves for the detection of delaminations due to barely visible impact damage (BVID) in composite panels has been verified.

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Section: Introductionsupporting

confidence: 86%

Guided wave propagation and scattering at composite delaminations

Hervin

Fromme

2021

Health Monitoring of Structural and Biological Systems XV

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“…Chiua , Roseb, Nadarajaha [9] built a 3D continuum model in ABAQUS of the 8 ply laminate with a symmetric stacking sequence [45/-45/0/90] S . Ng, Veidt [10] used a threedimensional Finite Element (FE) method to simulate an eight-ply [45/-45/0/90] S quasiisotropic composite laminate with a delamination.…”

Section: Numerical Model Using Finite Element Methodsmentioning

confidence: 99%

Numerical characterization of Symmetric Delamination in Orthotropic plate using Lamb waves

Nissabouri¹,

Allami²,

Boutyour³

2019

Proceedings of the Third International Conference on Computing and Wireless Communication Systems, ICCWCS 2019, April 24-25, 20

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In this paper we study numerical modeling of Lamb waves propagation and its interaction with the edges of symmetric delamination in unidirectional orthotropic plate [0] 4. The simulations were carried out using ABAQUS CAE by exciting the fundamental A 0 Lamb mode in the frequency 300 kHz. The delamination was then characterized by analyzing the signal picked up at two sensors using two technics: two Dimensional Fast Fourier Transform (2D-FFT) to identify the propagating and converted modes, and Wavelet Transform (WT) to measure the arrival times. The results showed that the mode A 0 is sensible to symmetric delamination. Besides, based on signal changes with the delamination edges, a localization method is proposed to estimate the position and the length of the delamination.

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“…Many researchers have used the numerical simulation to study Lamb waves. Chiua, Roseb, and Nadarajaha [3] built a 3D model in ABAQUS of the 8-ply laminate [45/-45/0/90] S . Guo and Cawley [4] investigated the influence of delamination position through the thickness and its interaction with the S 0 mode using finite element analysis.…”

Section: Numerical Model Using Femmentioning

confidence: 99%

“…The Lamb waves propagation in a 4-layer [0/90] s laminate were compared with propagations obtained in 1-layer [0] and in 3-layer [90/90/0] sublaminates. Chiua, Roseb, and Nadarajaha [3] investigated the scattering of the S 0 mode by a delamination in quasi-isotropic fibre-composite laminate. Guo and Cawley [4] studied by finite element analysis and by experiment the interaction of the S 0 Lamb mode with delamination.…”

Section: Introductionmentioning

confidence: 99%

Delamination Localization in Sandwich Skin Using Lamb Waves by Finite Element Method

Nissabouri

Allami

Boutyour

et al. 2018

Advances in Acoustics and Vibration

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In this work we model by finite element method (FEM) the Lamb waves’ propagation and their interactions with symmetric and asymmetric delamination in sandwich skin. The simulations were carried out using ABAQUS CAE by exciting the fundamental A0 Lamb mode in the frequency 300 kHz. The delamination was then estimated by analysing the signal picked up at two sensors using two technics: Two-Dimensional Fast Fourier Transform (2D-FFT) to identify the propagating and converted modes, and wavelet transform (WT) to measure the arrival times. The results showed that the mode A0 is sensible to symmetric and asymmetric delamination. Besides, based on signal changes with the delamination edges, a localization method is proposed to estimate the position and the length of the delamination. In the last section an experimental FEM verification is provided to validate the proposed method.

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Scattering of the Fundamental Anti-symmetric Lamb Wave by a Mid-plane Edge Delamination in a Fiber-composite Laminate

Cited by 23 publications

References 15 publications

Guided wave propagation and scattering at composite delaminations

Guided wave propagation and scattering at composite delaminations

Numerical characterization of Symmetric Delamination in Orthotropic plate using Lamb waves

Delamination Localization in Sandwich Skin Using Lamb Waves by Finite Element Method

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