Improved feature extraction of guided wave signals for defect detection in welded thermoplastic composite joints

Ferreira, Guilherme Rezende Bessa; Ribeiro, Mateus Gheorghe de Castro; Kubrusly, Alan C.; Ayala, Helon Vicente Hultmann

doi:10.1016/j.measurement.2022.111372

Cited by 8 publications

(2 citation statements)

References 61 publications

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“…The guided waves excited using PZT sensors were applied in defect detection in welded composite joints [9], estimation of the depth of cracks in thick steel beams [10] or plates [11], or de-bonding detection between concrete block and CFRP reinforcement [12]. This measurement technique was also used to monitor concrete curing [7] and corrosion identification [13].…”

Section: Introductionmentioning

confidence: 99%

An Influence of Actuator Gluing on Elastic Wave Excited in the Structure

Ziaja,

Jurek

2024

Materials

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In this article, the practical issues connected with guided wave measurement are studied: (1) the influence of gluing of PZT plate actuators (NAC2013) on generated elastic wave propagation, (2) the repeatability of PZT transducers attachment, and (3) the assessment of the possibility of comparing the results of Laser Doppler Vibrometry (LDV) measurement performed on different 2D samples. The consideration of these questions is crucial in the context of the assessment of the possibility of the application of the guided wave phenomenon to structural health-monitoring systems, e.g., in civil engineering. In the examination, laboratory tests on the web of steel I-section specimens were conducted. The size and shape of the specimens were developed in such a way that they were similar to the elements typically used in civil engineering structures. It was proved that the highest amplitude of the generated wave was obtained when the exciters were glued using wax. The repeatability and durability of this connection type were the weakest. Due to this reason, it was not suitable for practical use outside the laboratory. The permanent glue application gave a stable connection between the exciter and the specimen, but the generated signal had the lowest amplitude. In the paper, the new procedure dedicated to objective analysis and comparison of the elastic waves propagating on the surface of different specimens was proposed. In this procedure, the genetic algorithms help with the determination of a new coordinate system, in which the assessment of the quality of wave propagation in different directions is possible.

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Section: Introductionmentioning

confidence: 99%

An Influence of Actuator Gluing on Elastic Wave Excited in the Structure

Ziaja,

Jurek

2024

Materials

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“…Besides, in the ultrasonic welding process, the plastic flow and fusion on the welding spots and welding seams in millimeters to centimeters scale are the critical factors. [ 33,34 ] While, in the ultrasonic nano‐forming process in this work, the flow behavior and filling capability of thermoplastic material into AAO template in the nanoscale are considered to form a regular nanowire array on PVDF surface, and the surface morphology of the formed nanowire array also undergoes unique agglomerating evolution after dissolving template. Some researchers have explored the nanostructures forming on metals assisted by ultrasonic loading.…”

Section: Introductionmentioning

confidence: 99%

Rapid Forming of Nanowire Array on Polyvinylidene Fluoride Polymer Surfaces at Room Temperature by Ultrasonic Loading

Zhang

et al. 2022

Adv Eng Mater

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Forming nanostructures on a substrate have been an effective approach to regulating surface properties without changing material chemical compositions. However, such nano‐forming processes are generally based on thermal plastic forming that needs to heat substrate material to its melting point, which is time‐consuming and induces a risk of oxidation, aging, or phase transition, especially when the material is a polymer. This research work develops a novel method to rapidly form nanowire arrays on polyvinylidene fluoride (PVDF) polymer at room temperature. Assisted by ultrasonic vibration, nanowires with a diameter of 200 nm are formed on PVDF surface within 0.7 s, while the highest forming temperature is 124 °C only, which is much lower than the melting point. In addition, the original β phase of PVDF can be retained after nano‐forming by adjusting ultrasonic loading time. The agglomeration mechanism of the formed nanowires on the surface was also proposed based on the transverse flow and residual stress release during ultrasonic forming process. The water contact angle measurement showed that nanowire arrays altered the surface wettability of PVDF from hydrophilic to hydrophobic. This ultrasonic‐assisted processing provides a new approach for functional surface design of PVDF and rapid nanostructure forming for various applications.

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Debonding detection in FRP-strengthened concrete structures utilising nonlinear Rayleigh wave mixing

Cao

Smith

2023

Measurement

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Improved feature extraction of guided wave signals for defect detection in welded thermoplastic composite joints

Cited by 8 publications

References 61 publications

An Influence of Actuator Gluing on Elastic Wave Excited in the Structure

An Influence of Actuator Gluing on Elastic Wave Excited in the Structure

Rapid Forming of Nanowire Array on Polyvinylidene Fluoride Polymer Surfaces at Room Temperature by Ultrasonic Loading

Debonding detection in FRP-strengthened concrete structures utilising nonlinear Rayleigh wave mixing

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