Non-contact excitation and focusing of guided waves in CFRP composite plate by air-coupled transducers for application in damage detection

Jurek, Michał; Radzieński, Maciej; Kudela, Paweł; Ostachowicz, Wiesław

doi:10.1016/j.prostr.2018.12.203

Cited by 17 publications

(13 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Application of mechanical structures to alter the transducer directivity is not new. Fresnel zone lenses in front of transducer were proposed in [ 30 , 38 ], additional parabolic reflecting horn was used in [ 12 ] and cone-shaped waveguide was applied in [ 13 ]. Application of the parabolic reflecting horn was intended for mainlobe width reduction, but the sidelobes remained high (−10 dB according to Figure 6 in [ 12 ]).…”

Section: Discussionmentioning

confidence: 99%

“…Application of the parabolic reflecting horn was intended for mainlobe width reduction, but the sidelobes remained high (−10 dB according to Figure 6 in [ 12 ]). The cone-shaped waveguide is improving the lateral resolution, but near-range sidelobes remain (refer Figure 6 in [ 13 ]). Moreover, such waveguide introduces additional delays because of the multimodal propagation and, therefore, pulse duration is expanded.…”

Section: Discussionmentioning

confidence: 99%

“…Deviation of the probe’s beam pattern can cause incorrect inspection or diagnostics results [ 1 , 8 , 9 ]. Conformity of the focal spot is important in many applications [ 10 , 11 , 12 , 13 ]. Probe’s integrity may be lost during exploitation because outer matching layers are soft and they can be easily damaged [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Air-Coupled Ultrasonic Probe Integrity Test Using a Focused Transducer with Similar Frequency and Limited Aperture for Contrast Enhancement

Svilainis

Chaziachmetovas

Kybartas

et al. 2020

Sensors

View full text Add to dashboard Cite

Air-coupled ultrasonic probes require a special design approach and handling due to the significant mismatch to the air. Outer matching layers have to be soft so can be easily damaged and excitation voltages might cause the degradation of electrodes or bonding between the layers. Integrity inspection is desired during design, manufacturing, and exploitation. Spatial distribution of a transduction efficiency over piezoelement surface is proposed as a convenient means for the air-coupled probe integrity inspection. Focused transducer of similar center frequency is used to scan the surface of the inspected probe. However, such approach creates a challenge, i.e., area of the scanning beam is much smaller than the total receiving area of the inspected probe, therefore, contrast and imaging resolution are significantly degraded. Masking aperture made from cardboard and felt, placed at the focal point was proposed as solution. Far-range sidelobes were suppressed down to the noise floor (−50 dB) and the near-range sidelobes were reduced down to −17 dB. The proposed modification allows to use a similar frequency focused transducer. Probe integrity inspection can be carried out at significantly enhanced contrast and lateral resolution. Natural and artificial defects can be detected by the use of the proposed method.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Air-Coupled Ultrasonic Probe Integrity Test Using a Focused Transducer with Similar Frequency and Limited Aperture for Contrast Enhancement

Svilainis

Chaziachmetovas

Kybartas

et al. 2020

Sensors

View full text Add to dashboard Cite

show abstract

“…Such methods can be adjusted to excite different guided wave modes as the angle between the transducer and the sample can be easily adjusted (Panda et al 2018;Römmeler et al 2020). Laser and conventional air-coupled monitoring are usually combined, using conventional piezoelectric transducers for transmission and laser vibrometer for the reception (Jurek et al 2018). Other researchers combined air-coupled ultrasonic testing with thermal imaging (Rheinfurth et al 2011).…”

Section: Guided Wave Excitation and Mode Selectionmentioning

confidence: 99%

Ultrasonic Methods

Samaitis

Jasiūnienė

Paćko

et al. 2021

Structural Health Monitoring Damage Detection Systems for Aerospace

View full text Add to dashboard Cite

Ultrasonic inspection is a well recognized technique for non-destructive testing of aircraft components. It provides both local highly sensitive inspection in the vicinity of the sensor and long-range structural assessment by means of guided waves. In general, the properties of ultrasonic waves like velocity, attenuation and propagation characteristics such as reflection, transmission and scattering depend on composition and structural integrity of the material. Hence, ultrasonic inspection is commonly used as a primary tool for active inspection of aircraft components such as engine covers, wing skins and fuselages with the aim to detect, localise and describe delaminations, voids, fibre breakage and ply waviness. This chapter mainly focuses on long range guided wave structural health monitoring, as aircraft components require rapid evaluation of large components preferably in real time without the necessity for grouding of an aircraft. In few upcoming chapters advantages and shortcommings of bulk wave and guided wave ultrasonic inspection is presented, fundamentals of guided wave propagation and damage detection are reviewed, the reliability of guided wave SHM is discussed and some recent examples of guided wave applications to SHM of aerospace components are given.

show abstract

“…In recent years, elastic waves, especially guided waves, have been increasingly studied and used to monitor structural damage [7,8]. Ultrasonic Lamb wave is particularly concerned in structure health monitoring (SHM) researches and the corrosion monitoring technology [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Hole-Edge Corrosion Expansion Monitoring Based on Lamb Wave

Wang

Dai

et al. 2020

Metals

View full text Add to dashboard Cite

Corrosion is a critical issue for engineered metallic components in mechanical and aerospace industries. Due to the complexity of aerospace aluminum alloy structure, corrosion is particularly tend to occur and expand in stress concentration areas, such as the edge of a hole, which causes the overall structure to be more likely to fail. In this paper, a Lamb wave-based active sensing method with improved sensors network was used to detect the hole-edge corrosion expansion. A0 wave packet of Lamb wave is extracted from signals, and two damage factors are used as characteristics of the signals. Probabilistic imaging algorithm is used to imaging and quantify the hole-edge corrosion area. Five corrosion extension tests show that the proposed method can effectively locate and quantify the hole-edge corrosion damage expansion of a single-hole structure; furthermore, the normalized amplitude damage index and phase change damage index can be used to predict hole-edge corrosion expansion effectively.

show abstract

Non-contact excitation and focusing of guided waves in CFRP composite plate by air-coupled transducers for application in damage detection

Cited by 17 publications

References 11 publications

Air-Coupled Ultrasonic Probe Integrity Test Using a Focused Transducer with Similar Frequency and Limited Aperture for Contrast Enhancement

Air-Coupled Ultrasonic Probe Integrity Test Using a Focused Transducer with Similar Frequency and Limited Aperture for Contrast Enhancement

Ultrasonic Methods

Hole-Edge Corrosion Expansion Monitoring Based on Lamb Wave

Contact Info

Product

Resources

About