Beam shaping to enhance zero group velocity Lamb mode generation in a composite plate and nondestructive testing application

Faëse, Frédéric; Raetz, Samuel; Chigarev, Nikolay; Mechri, Charfeddine; Blondeau, James; Campagne, Benjamin; Gusev, Vitalyi; Tournat, Vincent

doi:10.1016/j.ndteint.2016.09.003

Cited by 19 publications

(8 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The relation (1) is useful for NDE purposes [29,[41][42][43] and will be used in the following to explain the experimentally revealed phenomena. It is also important to note that the spatial resolution of our method is scalable with the plate thickness since the ZGV mode wavelength is of the order of twice the plate thickness.…”

Section: Zero-group-velocity Lamb Modesmentioning

confidence: 99%

“…Their specific advantages, such as high spatial resolution, large bandwidth, and noncontact character, when compared to conventional ultrasonic methods based on piezoelectric transducers, are particularly appealing. In parallel, the recently implemented laser-based zero-group-velocity (ZGV) Lamb modes have proven to be an efficient tool to probe locally and accurately the thickness or the mechanical properties of plates, as well as to detect defects [22][23][24][25][26][27][28][29]. Yet, the use of LU monitoring of ZGV Lamb modes in solid plates, in order to evaluate or image the sample's damage, especially the fatigue-induced damage, has not been reported, while it could be useful for both modeling developments and practical applications.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Characterization of Progressive Fatigue Damage in Solid Plates by Laser Ultrasonic Monitoring of Zero-Group-Velocity Lamb Modes

et al. 2018

Self Cite

View full text Add to dashboard Cite

We propose a method for nondestructive characterization of progressive fatigue damage in solid plates, using a zero-group-velocity (ZGV) Lamb mode generated and detected by lasers. Our experimental results depict a nonmonotonous change in the ZGV mode frequency with an increasing number of loading cycles, and more importantly its drastic decrease prior to the specimen failure. We report three experiments on three specimens made of aluminum, which fail after different numbers of loading cycles. Despite this difference, the three nonmonotonous variations of the ZGV mode frequency with an increasing number of loading cycles are superimposed when plotted as a function of the normalized fatigue lifetime. This feature stresses out the potential of the technique to locate fatigue damage, to predict the fatigue lifetime, and to qualitatively, and even quantitatively, assess the different stages of fatigue damage in micrometer-to potentially centimeters-thick solid plates.

show abstract

Section: Zero-group-velocity Lamb Modesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization of Progressive Fatigue Damage in Solid Plates by Laser Ultrasonic Monitoring of Zero-Group-Velocity Lamb Modes

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…It is such a feature that makes these modes only sensitive to the local material properties and structural conditions, inherently immune to the perplexing wave behaviors related with complex geometrical features. Leveraging the features of ZGV modes, methods have been developed to enable the assessment of material properties and defect identification in local regions in previously challenging structures, [22][23][24][25][26] including fairly thin structures, multilayer structures, anisotropic mediums.…”

Section: Introductionmentioning

confidence: 99%

Advancing measurement of zero-group-velocity Lamb waves using PVDF-TrFE transducers: first data and application to in situ health monitoring of multilayer bonded structures

Liu

Guan

et al. 2022

Structural Health Monitoring

View full text Add to dashboard Cite

Driven by the rapid advancement in manufacturing technologies, engineering structures with complex geometries are increasingly applied in various industries, posing challenges to the applicability and adaptability of existing structural health monitoring methods based on guided ultrasonic waves. To fulfill the characterization of defects in complex structures, a novel approach featuring a conjunction of zero-group-velocity (ZGV) Lamb waves and polarized poly(vinylidenefluoride-co-trifluoroethylene) (PVDF-TrFE) transducers is proposed. In this approach, the PVDF-TrFE solvent is deposited and in situ polarized on the structure surface to form thin and flexible coatings, with which the ZGV waves can be excited efficiently and measured reliably. On this basis, the defect can be characterized by investigating the defect-induced alteration in ZGV wave features. In experimental validations, disbond defects in multilayer bonded structures are evaluated using the ZGV waves measured with fabricated PVDF-TrFE transducers. For the first time, the ZGV waves are measured in a contact and in situ manner. Compared with conventional noncontact measurement of ZGV waves, the proposed approach features a remarkably improved reliability, convenience for narrowband excitation, immunity to measurement uncertainty and capability of in situ monitoring. The proposed approach can advance the ZGV wave-based methods toward the in situ health monitoring and enable the defect evaluation in emerging complex structures.

show abstract

“…Further, this laser ultrasonic technique can produce wavefield images of much higher spatial resolution than conventional transducers [ 16 , 17 ]. Although this laser generation–laser receiving technique has been used for defect detection in different geometries [ 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ], minimal research is available for rails [ 13 , 28 ]. Therefore, there is a great need to conduct more research to investigate a fully non-contact laser-based inspection system that can detect the rail’s surface and subsurface defects.…”

Section: Introductionmentioning

confidence: 99%

Non-Contact Inspection of Railhead via Laser-Generated Rayleigh Waves and an Enhanced Matching Pursuit to Assist Detection of Surface and Subsurface Defects

Ghafoor

Tse

Rostami

et al. 2021

Sensors

View full text Add to dashboard Cite

Laser ultrasonic technology can provide a non-contact, reliable and efficient inspection of train rails. However, the laser-generated signals measured at the railhead are usually contaminated with a high level of noise and unwanted wave components that complicate the identification of defect echoes in the signal. This study explores the possibility of combining laser ultrasonic technology (LUT) and an enhanced matching pursuit (MP) to achieve a fully non-contact inspection of the rail track. A completely non-contact laser-based inspection system was used to generate and sense Rayleigh waves to detect artificial surface horizontal, surface edge, subsurface horizontal and subsurface vertical defects created at railheads of different dimensions. MP was enhanced by developing two novel dictionaries, which include a finite element method (FEM) simulation dictionary and an experimental dictionary. The enhanced MP was used to analyze the experimentally obtained laser-generated Rayleigh wave signals. The results show that the enhanced MP is highly effective in detecting defects by suppressing noise, and, further, it could also overcome the deficiency in the low repeatability of the laser-generated signals. The comparative analysis of MP with both the FEM simulation and experimental dictionaries shows that the enhanced MP with the FEM simulation dictionary is highly efficient in both noise removal and defect detection from the experimental signals captured by a laser-generated ultrasonic inspection system. The major novelty contributed by this research work is the enhanced MP method with the developments of, first, an FEM simulation dictionary and, second, an experimental dictionary that is especially suited for Rayleigh wave signals. Third, the enhanced MP dictionaries are created to process the Rayleigh wave signals generated by laser excitation and received using a 3D laser scanner. Fourth, we introduce a pioneer application of such laser-generated Rayleigh waves for inspecting surface and subsurface detects occurring in train rails.

show abstract

Beam shaping to enhance zero group velocity Lamb mode generation in a composite plate and nondestructive testing application

Cited by 19 publications

References 23 publications

Characterization of Progressive Fatigue Damage in Solid Plates by Laser Ultrasonic Monitoring of Zero-Group-Velocity Lamb Modes

Characterization of Progressive Fatigue Damage in Solid Plates by Laser Ultrasonic Monitoring of Zero-Group-Velocity Lamb Modes

Advancing measurement of zero-group-velocity Lamb waves using PVDF-TrFE transducers: first data and application to in situ health monitoring of multilayer bonded structures

Non-Contact Inspection of Railhead via Laser-Generated Rayleigh Waves and an Enhanced Matching Pursuit to Assist Detection of Surface and Subsurface Defects

Contact Info

Product

Resources

About