Abstract
Carbon fiber-reinforced plastics (CFRPs) are widely used in recreational products and industrial components. Ultrasound is a powerful tool to ensure the safety of CFRP structures, but the ultrasonic velocity on CFRP depends on the frequency and direction of propagation. Understanding ultrasonic propagation is the key to its proper application to CFRP structures. In the present work, experiments, 3D FEM simulations, and theoretical analyses were performed to investigate Lamb wave propagation on CFRP plates. The simulation and experimental results agreed well, proving that the FEM simulation results were reliable. On the basis of this reliability, further results were obtained for various fd values. The S0 mode’s group velocity was considerably affected by the propagation direction, but the A0 mode exhibited minimal dependence. In addition, unexpected waves were observed in the simulation and identified as the SH0 mode. A new approach for determining the theoretical group velocity was also presented.
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Acknowledgments
This work was supported by a grant from the National Research Foundation of Korea (NRF) and funded by the Korean government (MSIT) (No.NRF-2020M2D2A1A02069933). This work was also partially supported by the Korea Science Academy of KAIST with funds from the Ministry of Science, ICT, and Future Planning. The authors thank Dr. Jeong-Ki Lee for his valuable comments.
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Joonseo Song is an Undergraduate student in KAIST, Daejeon, Korea. He graduated from Korea Science Academy of KAIST in 2021 and will attend Oxford University, St. Anne’s College, as a physics major in October 2021. He is interested in entropy-driven phase transitions.
Subin Kim is an Undergraduate student in the Department of Physics and Astronomy of Seoul National University, Seoul, Korea. He graduated from Korea Science Academy of KAIST in 2021. He is interested in the analytic calculation of wave propagations.
Seungmin Kim is an Undergraduate student in KAIST, Daejeon, Korea. He graduated from Korea Science Academy of KAIST in 2021. He is currently interested in robotics.
Yunho Cho is a Professor at Pusan National University, Korea. He received his Ph.D. in Engineering Science and Mechanics from Pennsylvania State University. He is developing a technical diagnostic system that applies to the engineering of reliability analysis and diagnostics (structural health monitoring) of mechanical equipment. His laboratory is designated as a World-Class Research Center for World-Class Universities by the National Science Foundation, where he conducts research and develops world-class talent through ongoing government grants.
Young H. Kim is a Researcher at the Institute of Nuclear Safety and Management, Pusan National University, Busan, Korea. He received his Ph.D. in Physics from KAIST. He has worked as a principal researcher at the Korea Research Institute of Standards and Science, a visiting researcher at the National Bureau of Standards and Iowa State University, the head of KIECO R&D center, a research professor at Sungkyunkwan University, and a teacher at Korea Science Academy of KAIST. He has served as a lecturer in several universities, including Seoul National University and Pusan National University. He is interested in wave propagation and gifted education.
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Song, J., Kim, S., Kim, S. et al. Lamb wave propagation on a unidirectional CFRP plate: comparison of FEM simulations, experiments, and analytical calculations. J Mech Sci Technol 35, 3863–3869 (2021). https://doi.org/10.1007/s12206-021-2110-y
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DOI: https://doi.org/10.1007/s12206-021-2110-y