Effect of ply orientation and through-thickness position of delamination on the reflection of fundamental symmetric S0 Lamb mode in GFRP composite plate structures

Gupta, Saurabh; Rajagopal, Prabhu

doi:10.1016/j.ultras.2018.06.007

Cited by 31 publications

(17 citation statements)

References 23 publications

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“…In general, the A0 scattering at a delamination in an anisotropic multi-layer plate is more complicated than the scattering at a defect in isotropic plates [16]. For quasi-isotropic composite laminates, the scattering directivity patterns are dominated by the fiber orientation of the outer laminae and are highly dependent on the ply layup of the laminate [17]. Scattered amplitudes and directivity distributions are influenced by the delamination size to wavelength ratio and the through-thickness location, as the forward scattered amplitude is dependent on the phase difference between the waves propagating in each sub-laminate [18].…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

Guided wave propagation and scattering at composite delaminations

Hervin

Fromme

2021

Health Monitoring of Structural and Biological Systems XV

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“…Structural health monitoring (SHM) of transportation and infrastructural assets such as aircraft, bridges, tank floors, and ship hulls is vital for minimizing catastrophic failures 1‐5 . Ultrasonic guided waves are attractive for monitoring such large scale and complex structures 6‐8 .…”

Section: Motivationmentioning

confidence: 99%

“…Defect identification and localization has also been recently demonstrated by wave visualization using non‐contact reception at multiple locations for a fixed excitation 12,13 . In general, Lamb waves are widely discussed for delamination detection, and the authors have also published extensively on Lamb wave‐based detection of delamination in simple and complex composite structures 4,7,13,13‐17 . This paper is set in the context of reduction of sensor density for Lamb wave‐based SHM approaches.…”

Section: Motivationmentioning

confidence: 99%

Outlier analysis for defect detection using sparse sampling in guided wave structural health monitoring

Jagadeeshwar

Kanakambaran

Kalyani

et al. 2021

Struct Control Health Monit

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Summary We propose an outlier detection‐based statistical approach to identify and locate a defect in composite plates using far fewer number of sensing points compared to conventional imaging techniques. The key steps involved in this computationally inexpensive approach are the random sparse selection of the sensing points through Poisson disk sampling, followed by a two‐step outlier detection process based on thresholding and computation of median absolute deviation. The robustness of the proposed technique is explored through extensive simulations involving different defect sizes, random locations on flat plate structures, and various values of signal to noise ratio (SNR). We experimentally demonstrate the feasibility of detection of delamination, whose size is comparable to the ultrasonic wavelength with probability of detection (PoD) better than 90% using <1% of the total number of samples required for conventional imaging, even under conditions wherein the SNR is as low as 5 dB.

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“…Gupta et al [33] studied the interaction of a basic symmetric Lamb wave mode S 0 with laminations in eight layers of glass-fiber-reinforced polymer (GFRP) laminated composite by numerical simulation and experimental verification. The results showed that the sensitivity of S 0 mode reflection depended on the thickness direction and layering direction of the composite laminate.…”

Section: Lamb Modementioning

confidence: 99%

The Rapid Detection Technology of Lamb Wave for Microcracks in Thin-Walled Tubes

Wang

Yang

2019

Applied Sciences

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Thin-walled tubes are a kind of pressure vessel formed by a stamping and drawing process, which must withstand a great deal of sudden pressure during use. When microcrack defects of a certain depth are present on its inner and outer surfaces, severe safety accidents may occur, such as cracking and crushing. Therefore, it is necessary to carry out nondestructive testing of thin-walled tubes in the production process to eliminate the potential safety hazards. To realize the rapid detection of microcracks in thin-walled tubes, this study could be summarized as follows: (i) Because the diameters of the thin-walled tubes were much larger than their thicknesses, Lamb wave characteristics of plates with equal thicknesses were used to approximate the dispersion characteristics of thin-walled tubes. (ii) To study the dispersion characteristics of Lamb waves in thin plates, the detection method of the A 0 mode was determined using the particle displacement-amplitude curve. (iii) Using a multi-channel parallel detection method, rapid detection equipment for Lamb wave microcracks in thin-walled tubes was developed. (iv) The filtering peak values for defect signal detection with different depths showed that the defect detection peak values could reflect the defect depth information. (v) According to the minimum defect standard of a 0.045-mm depth, 100,000 thin-walled tubes were tested. The results showed that the missed detection rate was 0%, the reject rate was 0.3%, and the detection speed was 5.8 s/piece, which fully meets the actual detection requirements of production lines. Therefore, this study not only solved the practical issues for the rapid detection of microcracks in thin-walled tubes but also provided a reference for the application of ultrasonic technology for the detection of other components. Appl. Sci. 2019, 9, 3576 2 of 15 quantitatively, which can easily lead to misjudgment [10]. Magnetic particle testing is more suitable for surface defect detection, and it is difficult to quantitatively detect the depth of a flaw [10]. The X-ray method is mainly used to detect the volume of the defect inside the object. For an area defect, there will be an overlap of the front and back, and the angle between the ray beam and the orientation of the crack cannot exceed 10 • ; otherwise, it cannot be detected [10]. Penetration detection is limited to the defects of the surface opening. The penetrating liquid pollutes the parts and the environment and is not suitable for on-line detection [10]. Ultrasonic testing is sensitive to the area of the defect inside the object and can locate the relative size and location of the defect. The detection depth is much greater than other detection methods, and thus, it has been widely used [10]. For thin-walled tubes, ultrasonic Lamb waves are usually used for testing [11].The ultrasonic detection principle of thin-walled tubes is the same as that of pipe, and there are many studies on the principle, method, and application of Lamb wave detection of pipe for reference. Therefore, based...

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Effect of ply orientation and through-thickness position of delamination on the reflection of fundamental symmetric S0 Lamb mode in GFRP composite plate structures

Cited by 31 publications

References 23 publications

Guided wave propagation and scattering at composite delaminations

Guided wave propagation and scattering at composite delaminations

Outlier analysis for defect detection using sparse sampling in guided wave structural health monitoring

The Rapid Detection Technology of Lamb Wave for Microcracks in Thin-Walled Tubes

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