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.

碳纤维增强塑料 (CFRP) 广泛用于娱乐产品和工业部件。超声波是确保 CFRP 结构安全的有力工具，但 CFRP 上的超声波速度取决于传播的频率和方向。了解超声波传播是将其正确应用于 CFRP 结构的关键。在目前的工作中，通过实验、3D FEM 模拟和理论分析来研究兰姆波在 CFRP 板上的传播。模拟结果与实验结果吻合良好，证明有限元模拟结果是可靠的。在这种可靠性的基础上，对各种fd获得了进一步的结果值。S0 模式的群速度受传播方向的影响很大，但 A0 模式表现出最小的依赖性。此外，在模拟中观察到意外波并确定为 SH0 模式。还提出了一种确定理论群速度的新方法。