Delamination detection in composites through guided wave field image processing

Sohn, Hoon; Dutta, Debaditya; Yang, Jung–Min; Park, Hyunjun; DeSimio, Martin P.; Olson, Steven E.; Swenson, Eric D.

doi:10.1016/j.compscitech.2011.04.011

Cited by 165 publications

(134 citation statements)

References 20 publications

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“…The amplitude of the transmitted waves diminished noticeably after passing through the impacted area. Similar wave behaviour was also observed by Sohn et al [33], where the measurement was performed on a quasiisotropic composite plate. In the FE results in a different publication [34], a similar reduction in the amplitude past the delamination area was observed, which is in agreement with this experimental measurement.…”

Section: Attenuationsupporting

confidence: 65%

Propagation and scattering of guided waves in composite plates with defects

Murat

Fromme

2016

Int. J. Automot. Mech. Eng.

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Failure in aerospace composites owing to low-velocity impact raises a significant maintenance concern because it can lead to invisible damage. For the aerospace industry, such defects pose a potential danger to the structural integrity of aircraft. This in turn jeopardises passenger safety and incurs high repair costs. Hence, it is important to efficiently monitor composite structures during the service life. In this study, the potential of low-frequency guided ultrasonic waves for health monitoring in laminated composite plates is investigated. This study focuses on the use of the first antisymmetric guided wave mode (A0). The first part of this study is to investigate the propagation of the A0 mode in three different undamaged composite plates experimentally. The dispersive and anisotropic behaviour are in agreement with the results of finite element simulations and semi-analytical analysis. The final part of this study presents the scattering of guided waves at the impact damage using a non-contact laser interferometer. Significant scattering activities were observed and the impact damage size can be estimated to be about 10 × 25 mm. In conclusion, these results demonstrate the potential of guided ultrasonic waves for the inspection of aerospace composite structures.

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Section: Attenuationsupporting

confidence: 65%

Propagation and scattering of guided waves in composite plates with defects

Murat

Fromme

2016

Int. J. Automot. Mech. Eng.

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“…Guided wave technology provides an alternative solution for an in-service assessment of the integrity of the structure which can be deployed automatically. Damage detectability in composites using guided waves has been proved in many scientific publications (Hayashi and Kawashima 2002;Su et al 2002;Hay et al 2003;Paget et al 2003;Sohn et al 2004;Su and Ye 2004;Park et al 2005;Discalea et al 2007;Su et al 2007;Diamanti and Soutis 2010;Gao et al 2010;Ramadas et al 2011;Sohn et al 2011;Yeum et al 2012;Torkamani et al 2014). The anisotropic nature of composites due to the different ply-orientations produces a directional dependence of the wave propagation properties in terms of velocity and wave directionality (Rose 2012) which increases the difficulty of the data analysis.…”

Section: Guided Wave Technology In Compositesmentioning

confidence: 99%

“…It has been demonstrated that GW are capable to detect composite damages (Su et al 2002;Hay et al 2003;Discalea et al 2007;Sohn et al 2011), such as delamination, debonding or fibre cracking; and also to locate the damages analysing the TOF of the wave modes. One issue for GW application in blades is the wave attenuation, since the amplitude of the wave decreases rapidly during its propagation in this type of materials allowing the inspection within a limited area.…”

Section: Fig 34mentioning

confidence: 99%

“…The paths affected by damages are highlighted facilitating the visual localization of the damage. Another interesting technique is to apply a data processing algorithm to a wave field image acquired by a laser vibrometer system (Michaels et al 2011;Sohn et al 2011;Rogge and Leckey 2013). In (Michaels et al 2011), the authors use a signal processing technique in order to remove specific wave modes from the images in order to reveal low amplitude reflections from damages masked by high amplitude wave modes.…”

Section: Damage Detectionmentioning

confidence: 99%

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Damage Sensing in Blades

Crespo

2016

Mare-Wint

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This chapter is divided into three parts; the problem, possible solutions and the chosen option to address the problem, which is my PhD topic within the project MAREWINT. So firstly, the chapter presents an overview of the typical damages that a wind turbine blade can suffer during its life operation. Then, a review of different Structural Health Monitoring (SHM) techniques which are currently being investigated for wind turbine blades is presented. Finally, the chapter provides the state-of-the-art of Guided Wave Technology in composite materials; where different aspects of this SHM technique are explained in more detail. IntroductionWind energy is an important renewable energy source which has gained high relevance during the last decades. Different countries have released plans to invest in wind energy in the future years; such as the USA that will generate 20 % of the country's electricity from wind power by 2030 or Denmark that have set the targets of producing 50 % of the power from the wind by 2020 and also of making Denmark completely free of dependence on fossil fuels by 2050. So, the use of wind power is not expected to decrease within the next decade (Márquez et al. 2012). The trend is to manufacture bigger wind turbines and deploy them offshore. These new wind turbines have around 6 MW power output, 120-metre height tower and 80-metre long blades. They are designed to be operating in rough conditions in difficult-to-reach areas. Therefore, the deployment of Structural Health Monitoring (SHM) techniques becomes essential in order to assess remotely the integrity of the structure. The advantages of using these techniques are many (Schulz and Sundaresan 2006), such as reducing expensive costs for periodic inspections of turbines which are hard to reach, prevention of unnecessary replacement of components based on time of use, or minimizing down time and frequency of sudden breakdowns.

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“…Laser ultrasonic wave propagation imaging techniques visualize damage by constructing continuous images of full-field ultrasonic wave propagation in the target inspection region [1][2][3][4][5][6] with respect to time. Wave reflections, scattering, waveform and wave speed changes resulted from damage can be visually identified in the constructed wavefield images.…”

Section: Introductionmentioning

confidence: 99%

Reconstruction of laser ultrasonic wavefield images from reduced sparse measurements using compressed sensing aided super-resolution

Park¹,

Sohn²

2017

AIP Conference Proceedings

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Abstract. Laser ultrasonic scanning is attractive for damage detection due to its noncontact nature, sensitivity to local damage, and high spatial resolution. However, its practicality is limited because scanning at a high spatial resolution demands a prohibitively long scanning time. Recently, compressed sensing (CS) and super-resolution (SR) are gaining popularity in the image recovery field. CS estimates unmeasured ultrasonic responses from measured responses, and SR recovers high spatial frequency information from low resolution images. Inspired by these techniques, a laser ultrasonic wavefield reconstruction technique is developed to localize and visualize damage with a reduced number of ultrasonic measurements. First, a low spatial resolution ultrasonic wavefield image for a given inspection region is reconstructed from reduced number of ultrasonic measurements using CS. Here, the ultrasonic waves are generated using a pulsed laser, and measured at a fixed sensing point using a laser Doppler vibrometer (LDV). Then, a high spatial resolution ultrasonic wave image is recovered from the reconstructed low spatial resolution image using SR. The number of measurement points required for ultrasonic wavefield imaging is significantly reduced over 90%. The performance of the proposed technique is validated by an experiment performed on a cracked aluminum plate.

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Delamination detection in composites through guided wave field image processing

Cited by 165 publications

References 20 publications

Propagation and scattering of guided waves in composite plates with defects

Propagation and scattering of guided waves in composite plates with defects

Damage Sensing in Blades

Reconstruction of laser ultrasonic wavefield images from reduced sparse measurements using compressed sensing aided super-resolution

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