Polymer coating characterization based on ultrasonic interference and critical attenuation

Mori, Naoki; Okabe, Taiki; Hayashi, Takahiro

Structural Health Monitoring, 2025

Number of Access:276（2025-08-14 03:52 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/101108

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Title
Polymer coating characterization based on ultrasonic interference and critical attenuation
Creator
NRID
1000000802092 1000000802092
ORCID
0000-0002-0707-3443 0000-0002-0707-3443
researchmap permalink
7000020478 7000020478
Scopus Author ID
57790540700 57790540700
CreatorName
Mori, Naoki
CreatorName
Okabe, Taiki
NRID
1000030324479 1000030324479
ORCID
0000-0001-6064-4658 0000-0001-6064-4658
researchmap permalink
takahiro_hayashi takahiro_hayashi
Scopus Author ID
37064150200 37064150200
CreatorName
Hayashi, Takahiro
Description
Mori Naoki, Okabe Taiki, Hayashi Takahiro. Polymer coating characterization based on ultrasonic interference and critical attenuation. Structural Health Monitoring, 14759217251333460 (2025); https://doi.org/10.1177/14759217251333460.
Abstract
A characterization technique is proposed for polymer coating structures immersed in water based on the ultrasonic interference and critical attenuation phenomenon. When a coating layer is modeled as a linear viscoelastic material and is subjected to the normal incidence of an ultrasonic wave, the theoretical analysis shows that the reflection spectrum takes local minima at multiple frequencies, which correspond to the resonance frequencies of the coating layer depending on the wave velocity and the thickness under the assumption of relatively low loss factors. Furthermore, the lower envelope of the reflection spectrum yields the critical attenuation condition, which is closely related to the loss factor of the coating. These theoretical findings are applied to the viscoelastic characterization of the coating layers. Two bonded specimens with different substrate thicknesses validate the proposed method. As a result, the experimental data demonstrate that the estimated wave velocities and loss factors of the coatings agree well with the results reported in the previous paper. After the experimental validation, the proposed method is applied to the curing monitoring of a resin coating on a metal substrate. The ultrasonic responses provide the temporal variation of the layer resonance frequencies and the critical attenuation frequency by the resin curing. These results can be used to estimate the viscoelastic properties of the coating, which imply the curing state of the resin.
Publisher
SAGE Publications
Source Title
Structural Health Monitoring
Date of Issued
2025-04-21
Handle URL
https://hdl.handle.net/11094/101108
PISSN
14759217
eISSN
17413168
Relation.isVersionOf
DOI (Publisher Version)
https://doi.org/10.1177/14759217251333460
Access Rights
open access
CopyRight
© 2025 The Authors
oaire:version
Accepted Manuscript
Category
学術雑誌論文 Journal Article