Variation in the group velocity of Lamb waves as a tool for the detection of delamination in GLARE aluminium plate-like structures

Rosalie, Stephane Cedric; Vaughan, Michael; Bremner, Alan; Chiu, Wing Kong

doi:10.1016/j.compstruct.2004.04.024

Cited by 29 publications

(19 citation statements)

References 13 publications

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“…The use of guided waves in ultrasonic inspection of plate structures has been used successfully for the localization of defects (inclusions, delaminations, cracks) but is more complicated than conventional bulk wave inspection [7][8][9][10]. This is mainly due to dispersion effects and multimode propagation.…”

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confidence: 98%

Detecting Damage in Composite Material Using Nonlinear Elastic Wave Spectroscopy Methods

2008

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Modern aerospace structures make increasing use of fibre reinforced plastic composites, due to their high specific mechanical properties. However, due to their brittleness, low velocity impact can cause delaminations beneath the surface, while the surface may appear to be undamaged upon visual inspection. Such damage is called barely visible impact damage (BVID). Such internal damages lead to significant reduction in local strengths and ultimately could lead to catastrophic failures. It is therefore important to detect and monitor damages in high loaded composite components to receive an early warning for a well timed maintenance of the aircraft. Non-linear ultrasonic spectroscopy methods are promising damage detection and material characterization tools. In this paper, two different non-linear elastic wave spectroscopy (NEWS) methods are presented: single mode nonlinear resonance ultrasound (NRUS) and nonlinear wave modulation technique (NWMS). The NEWS methods were applied to detect delamination damage due to low velocity impact (<12 J) on various composite plates. The results showed that the proposed methodology appear to be highly sensitive to the presence of damage with very promising future NDT and structural health monitoring applications.

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confidence: 98%

Detecting Damage in Composite Material Using Nonlinear Elastic Wave Spectroscopy Methods

2008

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“…Generally, these signals generated were complex in nature, featured by different group speed, amplitude of wave, etc. [1][2][3]. Therefore, baseline signals acquired from an intact structure are essential for calibration and delamination detection [1][2][3], especially for monitoring the propagation of a damage with high accuracy.…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, some relevant techniques for detecting delaminations in composite laminates have been developed [1][2][3]. Among these techniques, a two-stage model has been commonly adopted by which the difference between the signals from a defective structure and an intact structure can be used to define the so called residual error.…”

Section: Introductionmentioning

confidence: 99%

Identification of delamination position in cross-ply laminated composite beams using S0 Lamb mode

Shimomukai

Chen

et al. 2008

Composites Science and Technology

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In this work, a Lamb wave based technique has been developed for delamination detection in cross-ply laminated beams. By measuring the propagation speed of S 0 Lamb mode and the traveling time of a signal reflected from a delamination site, the location of the delamination can be identified. It has been also confirmed by the experiment that the location of a delamination can be accurately determined by only using the data collected from the sensors in a defect-containing beam, without referring to the baseline signals. Finally, to gain a better understanding of the complex interaction between a Lamb wave and a long delamination, numerical simulations have been carried out using finite element method (FEM). The signal modes generated at the boundaries of the delamination have been analyzed.

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“…As expected, the change of these modal parameters is insensitive to the extent of the damage for the first few natural frequencies. When the transient waves propagate in the beam containing delamination [2,3] , the damaged region generates reflection and transmission waves which carry information on the nature of the damage. Obviously the transmitted flexural wave velocity in the delaminated region is decreased due to the reduction of overall bending stiffness.…”

Section: Introductionmentioning

confidence: 99%

Power Reflection and Transmission in Beam Structures Containing a Semi-Infinite Crack

Zhou

Yuan

2008

Acta Mech. Solida Sin.

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Wave reflection and transmission in a beam containing a semi-infinite crack are studied analytically based on Timoshenko beam theory. Two kinds of crack surface conditions: non-contact (open) and fully contact (closed) cracks, are considered respectively for an isotropic beam. The analytical solution of reflection and transmission coefficients for a semi-infinite crack is obtained. The power reflection and transmission ratios depend on both the frequency and the position of the crack. Numerical results show the conservation of power transport. The transmitted energy among various wave modes is also investigated. A finite element method is used to verify the validity of the analytical results.

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Variation in the group velocity of Lamb waves as a tool for the detection of delamination in GLARE aluminium plate-like structures

Cited by 29 publications

References 13 publications

Detecting Damage in Composite Material Using Nonlinear Elastic Wave Spectroscopy Methods

Detecting Damage in Composite Material Using Nonlinear Elastic Wave Spectroscopy Methods

Identification of delamination position in cross-ply laminated composite beams using S0 Lamb mode

Power Reflection and Transmission in Beam Structures Containing a Semi-Infinite Crack

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