Stoneley Wave in a Rod Surrounded by a Cylindrical Multilayered Cladding
The excitation and propagation characteristics of the Stoneley waves in a rod surrounded by a cylindrical multi-layered cladding are investigated for the application in nondestructive testing to detect the grouted rockbolts. Numerous rockbolts are used to support the civil engineers and mining roofs, and they need to be test effectively. Former studies are focused on using the normal guided waves propagated in the hard cladding model whose shear velocity of the cladding is larger than that of the rockbolt. However, most rockbolts are inserted in the soft cladding. In this case, there is no normal guided wave existed, yet may have the Stoneley waves under certain conditions. Therefore, the investigation of the Stoneley waves’ behavior is significant but seldom reported. First, the existence conditions for the Stoneley wave in cylindrical interface are received by discussing the effects of both the material combination and shear velocity of the cladding on the existence of Stoneley wave in double-and three-layered cladding models. Then, the dispersion curves of the longitudinal and flexural Stoneley waves in the soft and hard cladding models are numerical predicted by using the bisection technique. Moreover, the excitation characteristics, ignored in previous references, of the Stoneley waves are analyzed and compared with those of the normal waves. It is predicted that the guided waves received in actual measurement should be the Stoneley waves, while the normal waves are seriously covered by the Stoneley waves and impossible to be seen in fullwaveforms, when the Stoneley wave existence condition is satisfied.
Bixing Zhang Hanyin Cui
State Key Laboratory of Acoustic,Institute of Acoustics,Chinese Academy of Sciences,Beijing,100190,P.R.China
国际会议
The 10th Western Pacific Acoustics Conference(第十届西太平洋声学会议WESPAC X)
北京
英文
1-5
2009-09-21（万方平台首次上网日期，不代表论文的发表时间）