Evaluation of the acoustic nonlinearity parameter of materials with Rayleigh waves excited directly  

作　　者：SHUI Guoshuang WANG Yuesheng Jianmin Qu Jin-Yeon Kim Laurence J. Jacobs 

机构地区：[1]Institute of Engineering Mechanics, Beijing Jiaotong University Beijing 100044 [2]School of Mechanical Engineering, Georgia Institute of Technology Atlanta, Georgia 30332-0405, USA

出　　处：《Chinese Journal of Acoustics》2010年第2期107-119,共13页声学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(10228204);Beijing Natural Science Foundation(KZ200810005001);Foundation of Beijing Jiaotong University(2007XM030)

摘　　要：An experimental technique for the determination of the relative acoustic nonnnearity parameter of materials with Rayleigh waves excited directly is presented. Rayleigh surface waves were directly generated in materials by the specific piezoelectric transducer fixed at the specimen＇s edge, and were measured with a laser interferometer system. After the Rayleigh wave signals were processed with FFT method, the relative acoustic nonlinearity parameter of materials was then determined from the absolute magnitudes of the fundamental and second harmonics of Rayleigh surface waves. This procedure was used to determine the acoustic non- linearity parameters of aluminum alloys 2024 and 6061. It is shown that the results comply well with those available in the literature; this method can thus be used to evaluate the acous- tic nonlinearity parameter of materials effectively. This technique can provide a practical way in the nondestructive characterization of degradation of materials and structures in the early fatigue life.An experimental technique for the determination of the relative acoustic nonnnearity parameter of materials with Rayleigh waves excited directly is presented. Rayleigh surface waves were directly generated in materials by the specific piezoelectric transducer fixed at the specimen＇s edge, and were measured with a laser interferometer system. After the Rayleigh wave signals were processed with FFT method, the relative acoustic nonlinearity parameter of materials was then determined from the absolute magnitudes of the fundamental and second harmonics of Rayleigh surface waves. This procedure was used to determine the acoustic non- linearity parameters of aluminum alloys 2024 and 6061. It is shown that the results comply well with those available in the literature; this method can thus be used to evaluate the acous- tic nonlinearity parameter of materials effectively. This technique can provide a practical way in the nondestructive characterization of degradation of materials and structures in the early fatigue life.

分 类 号：O212.1[理学—概率论与数理统计] TM22[理学—数学]