Evaluation of disbonds in adhesively bonded multilayer plates through local wavenumber estimation

Spytek, Jakub; Ambroziński, Łukasz; Pieczonka, Łukasz

doi:10.1016/j.jsv.2021.116624

Cited by 14 publications

(5 citation statements)

References 37 publications

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“…where Δf is the interval between two adjacent resonant frequencies, and Δf is numerically equal to the resonant frequency f. Because the thickness of the nickel sheet is 0.07 mm, the bond between the nickel sheet and the silicone is characterized by the bond coefficient I according to equation (7), ignoring 1/d:…”

Section: Theorymentioning

confidence: 99%

“…The bond strength between different materials can be evaluated by x-ray [4], Lamb wave [5] and ultrasonic [6][7][8][9]. Jasiūnienė [4] used x -ray to scan the composite fault, To evaluate the effect of the adhesive layer pores on the properties of the adhesive layer, but this method requires the destructive testing of the sample; Ren et al [5] used Lamb wave to study the metal bonding layer.…”

Section: Introductionmentioning

confidence: 99%

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Ultrasonic resonance-based inspection of ultra-thin nickel sheets bonded to silicone

Hou

Li²,

Xia³

et al. 2023

Mater. Res. Express

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In the field of nondestructive testing (NDT), the bond defect detection of ultra-thin metal and silica gel is a difficult problem. In this study, the ultrasonic resonance method was used to evaluate the bonding quality of ul-thin metal. Study three different bond states of ultra-thin nickel sheet and silicon film composite, nickel and silica gel bond state, the absorption of ultrasonic differences, with the use of high-frequency ultrasound in ultra-thin nickel slice of resonance, through the resonance signal analysis of ultra-thin nickel sheet and silicon film combination, the bonding coefficient of the bond state between ultra-thin nickel sheet and silica gel. Through experimental comparison, the results show that the attenuation of ultrasonic signal in the nickel sheet and silicon film with different bonding states characterize the bonding state of ultra-thin nickel sheet and silicon film by the bonding coefficient, the bonding coefficient of good parts, weak adhesive parts and debonded parts is reduced successively. By setting an appropriate determination threshold value, the bonding state between the ultra-thin nickel sheet and the silicon film can be accurately determined according to the bonding coefficient obtained by detection.

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Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ultrasonic resonance-based inspection of ultra-thin nickel sheets bonded to silicone

Hou

Li²,

Xia³

et al. 2023

Mater. Res. Express

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show abstract

“…A different approach was taken by Spytek at el. [20] and Flynn at el. [21], which divided the wavenumber range into subbands instead of using windows to divide the acquisition spatial domain.…”

Section: Introductionmentioning

confidence: 97%

“…When dealing with flat panels, A0 mode is the more easily excited and carries most of the energy [22]. For this reason state-of-the-art methods reported in [20]- [21] are based on the separation of Lamb's wave propagation modes following A0 dispersion curve.…”

Section: Introductionmentioning

confidence: 99%

A wavefront track approach to defect detection in composites by scanning laser Doppler vibrometry

Candelaresi,

Annessi,

Allevi

et al. 2024

J. Phys.: Conf. Ser.

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Composite laminates are becoming increasingly popular in a large variety of applications due to their favourable mechanical properties. However, laminates production processes can lead to various defects in the final material. The most common type is related to thickness variations, e.g. delaminations between layers, which can compromise the mechanical strength of the structure. Therefore, there is a great interest in developing non-destructive and non-contact quality control techniques for composite material assessment to minimize process costs. An interesting approach is the use of laser Doppler vibrometry combined with signal analysis based on Lamb waves propagation. In this work, we used an impulsive force given by a piezoelectric disk to the specimen and a laser Doppler vibrometer acquiring the points velocity over time along a scanning grid on the surface. The specimen is a fiberglass reinforced flat panel with seven different orientated layers which presents a delamination of about 22 mm. The maximum thickness-frequency product achieved in this analysis has been 0.2 MHz∙mm. In contrast to state-of-the-art methods for identifying thickness variation based on local estimation of the principal wave number, the proposed algorithm makes use of a tracking filter of the wave front of the propagating A0 mode waves, returning a final image in polar coordinates. The final information given by the algorithm provides the position of the delamination and, hence, can be used as a pass/failure test. State-of-the-art methods are also able to identify the shape of the defect but pay the price of a higher computational cost by using at least 4D matrix processing unlike our method which only uses 3D matrices.

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“…The results of the tests in the form of a-scan and c-scan images of the longitudinal waves showed that without analysis using advanced data analysis algorithms, the results of the ultrasonic testing, in the form of changes in pulse amplitude or ultrasonic wave propagation time, are not sufficient and give too generalized information about the state of the joint. However, Spytek et al [ 34 ] demonstrated the feasibility of using guided elastic waves generated by a laser beam to evaluate adhesive joints. The proposed test method can obtain clear images of layered joints, which are the basis for determining the quality of the connection.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Adhesive Joints Using Ultrasonic Rayleigh Waves

Kowalczyk,

Ulbrich

2024

Materials

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Adhesive joints are non-separable connections that are used in numerous ways in vehicle construction, particularly in buses. The widespread use of adhesive joints makes it necessary to assess their quality, especially under production conditions. The main goal of this study was to develop a mathematical model to estimate the width of the adhesive path in a plywood-adhesive-closed-profile joint based on selected parameters of the ultrasonic surface wave. A digital ultrasonic flaw detector and Rayleigh wave probes were applied. The test involved evaluating different widths of hybrid adhesive and two-component epoxy adhesive. The tests were conducted on a steel profile from a bus construction. The attenuation of the ultrasonic waves on the steel profile (0.026 db/mm) and the adhesive (0.264 dB/mm) was determined. A one-size-fits-all model for estimating adhesive path width for specific conditions is proposed.

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Evaluation of disbonds in adhesively bonded multilayer plates through local wavenumber estimation

Cited by 14 publications

References 37 publications

Ultrasonic resonance-based inspection of ultra-thin nickel sheets bonded to silicone

Ultrasonic resonance-based inspection of ultra-thin nickel sheets bonded to silicone

A wavefront track approach to defect detection in composites by scanning laser Doppler vibrometry

Evaluation of Adhesive Joints Using Ultrasonic Rayleigh Waves

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