Microstructure Effects of Ultrasonic Waves in a Fiber Reinforced Composite Plate
HAN Jun-Bo1, TANG Li-Guo1, CHENG Jian-Chun1, Yves Berthelot2
1The State Key Laboratory of Modern Acoustics, Nanjing University, Nanjing 210093
2School of Mechanical Engineering, Georgia Institute of Technology, Atlanta GA30332-0405, USA
Microstructure Effects of Ultrasonic Waves in a Fiber Reinforced Composite Plate
HAN Jun-Bo1;TANG Li-Guo1;CHENG Jian-Chun1;Yves Berthelot2
1The State Key Laboratory of Modern Acoustics, Nanjing University, Nanjing 210093
2School of Mechanical Engineering, Georgia Institute of Technology, Atlanta GA30332-0405, USA
Abstract： The microstructure effect of ultrasonic waves in a unidirectional titanium graphite composite is analyzed by the mode energy conversions of the laser-generated ultrasonic Lamb waves. The carrying energy of each mode in the Lamb waves is calculated quantitatively by the time-frequency filtering technique of the Wigner distribution. We found that the energy conversions among modes have happened in the process of propagation of ultrasonic Lamb wave. These energy conversions are attributed to microstructure scattering of ultrasonic wave by the fibers in a fiber reinforced composite material. This work will provide a quantitative method of ultrasonic characterization of microstructure feature of the composite materials by the laser-generated Lamb wave technique.
2000, Vol. 17 
