Next Article in Journal
Comparison of SF6 and CF4 Plasma Treatment for Surface Hydrophobization of PET Polymer
Previous Article in Journal
An Innovative Approach to Control Steel Reinforcement Corrosion by Self-Healing
Open AccessArticle

Research on the Transmission Characteristics of Air-Coupled Ultrasound in Double-Layered Bonded Structures

1
School of Mechanical and Electronic Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, China
2
Key Lab of Nondestructive Testing, Ministry of Education, Nanchang Hangkong University, Nanchang 330063, China
3
Japan Probe, 1-1-14 Nakamura Chou Minami Ward Yokohama City, Kanagawa Prefecture 2320033, Japan
*
Author to whom correspondence should be addressed.
Materials 2018, 11(2), 310; https://doi.org/10.3390/ma11020310
Received: 28 January 2018 / Revised: 28 January 2018 / Accepted: 18 February 2018 / Published: 21 February 2018
(This article belongs to the Section Structure Analysis and Characterization)
The ultrasonic transmission spectrum in a double-layered bonded structure is related closely to its interfacial stiffness. Consequently, researching the regularity of the transmission spectrum is of significant interest in evaluating the integrity of the bonded structure. Based on the spring model and the potential function theory, a theoretical model is developed by the transfer matrix method to predict the transmission spectrum in a double-layered bonded structure. Some shift rules of the transmission peaks are obtained by numerical calculation of this model with different substrates. The results show that the resonant transmission peaks move towards a higher frequency with the increase of the normal interfacial stiffness, and each of them has different movement distances with the increasing interfacial stiffness. Indeed, it is also observed that the movement starting points of these peaks are at the specific frequency at which the thickness of either substrate plate equals an integral multiple of half a wavelength. The results from measuring the bonding specimens, which have different interfacial properties and different substrates in this experiment, are utilized to verify the theoretical analysis. Though the theory of “starting points” is not demonstrated effectively, the shift direction and distance exactly match with the result from the theoretical algorithm. View Full-Text
Keywords: weak bonded; air-coupled ultrasound; transmission peaks; interfacial stiffness; double-layered bonded structures weak bonded; air-coupled ultrasound; transmission peaks; interfacial stiffness; double-layered bonded structures
Show Figures

Figure 1

MDPI and ACS Style

Wang, X.-G.; Wu, W.-L.; Huang, Z.-C.; Chang, J.-J.; Wu, N.-X. Research on the Transmission Characteristics of Air-Coupled Ultrasound in Double-Layered Bonded Structures. Materials 2018, 11, 310.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop