Lamb wave method for quick inspection of impact-induced delamination in composite laminates

Toyama, Nobuyuki; Takatsubo, Junji

doi:10.1016/j.compscitech.2003.10.011

Cited by 86 publications

(63 citation statements)

References 15 publications

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“…Both of the sensing indicators increase with the damage size. The detection accuracy can be improved by increasing the number of signal acquisition points, as illustrated in [12] by a 2-dimensional scanning method. Another experimental approach for evaluating the health condition of an impact-damaged laminate is to examine the guided wavefield acquired by a scanning laser vibrometer (SLV).…”

Section: Introductionmentioning

confidence: 99%

“…Hence, most of the research on guided-wave propagation in impacted laminates has been based on experiments and numerical modelling. Regarding experimental characterisation, low-velocity impact damage is normally introduced into a laminate through drop weight [10][11][12] or quasi-static indentation tests [13][14][15]. The location and size of damage and/or flaws can be ascertained by the phase shift and amplitude difference between the sensing signals acquired before and after impact [10,11,16].…”

Section: Introductionmentioning

confidence: 99%

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An integrated numerical model for investigating guided waves in impact-damaged composite laminates

Zhang

Sun

Eaton

et al. 2017

Composite Structures

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This paper presents a novel numerical technique that combines predictions of impact-induced damage and subsequent ultrasonic guided-wave propagation in composite laminates, with emphasis on the development and verification of the modelling framework. Delamination and matrix cracking are considered in the modelling technique, which is validated by experimental measurements on a carbon-fibre/epoxy plate using a drop-weight impact tower and a scanning laser vibrometer. Good agreement has been found between simulations and experiments regarding the impact response and globallocal wavefields. Effects of these two damage modes, damage extent and multiple impacts on guided waves are studied using the modelling tool. Matrix cracking leads to lower wavefield scattering compared with delamination, particularly in un-damaged regions.The modelling strategy can provide valuable guidelines for optimising health-monitoring arrangements on composite structures that are susceptible to impacts, and the guidedwave model can also be integrated with other numerical models for predicting internal flaws in composite laminates.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An integrated numerical model for investigating guided waves in impact-damaged composite laminates

Zhang

Sun

Eaton

et al. 2017

Composite Structures

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“…Typically it has been found to be advantageous to operate with a single wave mode at low frequency in order to avoid complications in the signal analysis and high attenuation [15]. The capacity for the detection of delaminations [16,17] and cracks [18,19] in composite structures has been successfully shown from numerical simulations and experimental investigations. The scattering of the first symmetrical (S0) wave mode by cracks in a composite plate has been studied [19].…”

Section: Introductionmentioning

confidence: 95%

3D finite element modelling of guided wave scattering at delaminations in composites

Murat

Fromme

2016

AIP Conference Proceedings

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“…sandwiches, double shell fuselage) pose further strong restrictions on the accessibility for conventional ultrasonic testing. Lamb wave can penetrate large areas of components and therefore are able to provide fast inservice inspections without time consuming scanning [3,4,5,6]. There are passive and active methods.…”

Section: Introductionmentioning

confidence: 99%

Visualisation of guided wave propagation by ultrasonic imaging methods

Hillger¹,

Szewieczek²

2011

IJMPT

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-Composite materials are more and more used for primary structures in aerospace components. Examples are the new aeroplanes Boeing 787 and the Airbus A350 which are mostly produced out of composites. In order to take advantage of the specific properties of composites the complexity of the structures increases more and more. On the other hand the costs for inspection after fabrication and especially in service have to decrease. Cost effective NDT-methods have to be implemented. This paper presents the possibilities of guided waves inspection techniques for complex composite components. Guided waves such as Lamb waves can be easily excitated and received by applied piezo-elements and penetrate large areas so that complex structures in principle can be inspected (SHM). However, for each frequency in minimum two different wave modes exist so that the responses are difficult to evaluate. The Lamb wave research is carried out within the EU project AISHA. The ultrasonic imaging technique is successfully used for the visualisation of the Lamb wave propagation. This combination between SHM and ultrasonic technique provides the optimisation of the sensor and actuator placement and also an interesting method for in-field inspection of air aerospace components. The coupling of the scanning receiver transducer can be carried out with water split coupling as well as with air (non contact).

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Lamb wave method for quick inspection of impact-induced delamination in composite laminates

Cited by 86 publications

References 15 publications

An integrated numerical model for investigating guided waves in impact-damaged composite laminates

An integrated numerical model for investigating guided waves in impact-damaged composite laminates

3D finite element modelling of guided wave scattering at delaminations in composites

Visualisation of guided wave propagation by ultrasonic imaging methods

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