<i>In-situ</i>process- and online structural health-monitoring of composites using embedded acoustic waveguide sensors

Shah, Harsh; Balasubramaniam, Krishnan; Rajagopal, Prabhu

doi:10.1088/2399-6528/aa8bfa

Cited by 12 publications

(4 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Three experimental samples were custom-prepared with a 450 mm sleeved steel waveguide embedded in a concrete block of size 300 mm × 200 mm × 200 mm. The sleeve coating consisted of a flexible polyolefin heat-shrink tubing 53 which was inserted into the 3.2 mm waveguide and heated to remove any air pockets between the steel waveguide and the coating. A sleeve opening of size 10 mm was made at a distance of 250 mm from the excitation point.…”

Section: Methodsmentioning

confidence: 99%

Sleeved waveguide ultrasonic sensor for monitoring concrete health

Kairu,

Gatari,

Mumenya

et al. 2023

Structural Health Monitoring

Self Cite

View full text Add to dashboard Cite

This article reports the development of a novel embedded waveguide ultrasonic sensor for detecting the onset of damage in reinforced concrete structures. A sleeved waveguide is proposed to confine guided ultrasonic waves in one-dimension, with leakage to the surrounding media only through specially created openings, thus reducing attenuation losses and enhancing the capability to inspect large structures from a single transducer location. The test frequency and mode are identified through modelling, and the interaction of leaky guided ultrasonic waves with delamination within the concrete volume is studied. Numerical simulations validated by experiments are used to study the changes in wave features such as mode velocity, wavelength and wave reflection in the delamination region, helping to estimate its location. Further simulation studies are carried out to demonstrate the possibility of using multiple waveguide sensors and sleeve openings to provide a full view of the concrete volume. The results are encouraging for practical long-range and large-scale monitoring of concrete volumes using the proposed sleeved waveguide ultrasonic sensors.

show abstract

Section: Methodsmentioning

confidence: 99%

Sleeved waveguide ultrasonic sensor for monitoring concrete health

Kairu,

Gatari,

Mumenya

et al. 2023

Structural Health Monitoring

Self Cite

View full text Add to dashboard Cite

show abstract

“…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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…W AVEGUIDES are extended structures used for confining and guiding elastic and other types of waves, initially studied widely in the context of measurement of flow [1], [2]. Today they find applications in the remote monitoring of temperature [3], viscosity [4], [5], environmental parameters [6], material properties [7], [8], setting of concrete [9]- [11] and curing of composites [12], especially when the vulnerable transducers and piezoelectric elements need to be isolated from harsh environments. Examples are the measurement of thickness at temperatures >500 0 C [13], thickness of hot plates and molten metals up to 960 0 C and on-line monitoring of polymer extrusion [14].…”

Section: Introductionmentioning

confidence: 99%

Graded Elastic Waveguide Metamaterial Rod for Up-Conversion of Longitudinal Axisymmetric Guided Ultrasonic Wave Modes

Kumar,

Ramachandran,

Balasubramaniam

et al. 2023

IEEE Open J. Ultrason., Ferroelect., Freq. Contr.

Self Cite

View full text Add to dashboard Cite

Cylindrical or circular rod-type waveguides are of much interest in applications such as measurement of flow, temperature, material properties in harsh environments, and also in medical diagnostics. However, multiple waveguide modes exist in such systems, out of which only some are of interest to certain applications. For example, L(0,3) longitudinal mode excitation can optimally transmit elastic waves into the test specimen and help in better sensing and measurement when compared to other modes within the family of longitudinal guided waves. This paper demonstrates the up-conversion of longitudinal modes within the family of guided ultrasonic rod waves (from L(0,2) to L(0,3)), which is of interest to certain waveguide transducer applications. The mode up-conversion is demonstrated using numerical simulations and experiments. An analysis is used to bring more insights and guide the design of the metamaterial in this process.

show abstract

In-situprocess- and online structural health-monitoring of composites using embedded acoustic waveguide sensors

Cited by 12 publications

References 24 publications

Sleeved waveguide ultrasonic sensor for monitoring concrete health

Sleeved waveguide ultrasonic sensor for monitoring concrete health

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

Graded Elastic Waveguide Metamaterial Rod for Up-Conversion of Longitudinal Axisymmetric Guided Ultrasonic Wave Modes

Contact Info

Product

Resources

About