Experimental and numerical studies on group velocity of ultrasonic guided waves in rock bolts with different grouted ratios

2019 ◽  
Vol 114 ◽  
pp. 103130 ◽  
Author(s):  
Jung-Doung Yu ◽  
Yong-Hoon Byun ◽  
Jong-Sub Lee
Keyword(s):  
Group Velocity ◽  
Guided Waves ◽  
Ultrasonic Guided Waves ◽  
Rock Bolts ◽  
Numerical Studies

scholarly journals Effects of Adhesive Parameters on Dispersion Characteristics of Ultrasonic Guided Waves in Composite Pipes

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Juanjuan Li ◽  
Yan Han
Keyword(s):  
Group Velocity ◽  
Guided Waves ◽  
Velocity Dispersion ◽  
Group Velocity Dispersion ◽  
Adhesive Layer ◽  
Dispersion Curves ◽  
Ultrasonic Guided Waves ◽  
Bonding Quality ◽  
Mode Identification ◽  
Composite Pipes

The aim of the investigation presented here was to understand how the viscosity parameters of an adhesive layer affect group velocity and attenuation of the double-layer adhered pipe. Various parameter combinations (attenuation of longitudinal wave and shear wave, pαL and qαT; thickness, d; and density, nρ) were utilized in order to generate different uncured degrees of the adhesive layer. In the frequency range 0∼500 kHz, the group velocity dispersion curves and attenuation dispersion curves were obtained from these models. Then, the group velocity and attenuation of the two commonly used modes, L0,2 and T0,1, were compared and analyzed. The results have shown that it is important to remark that little effect on group velocity was caused, and significant linear increases of attenuation occur with increase in q, d, and n. However, variable p had little effect on attenuation; more modes emerged when d increased or n decreased, causing difficulties on mode identification and signal processing. The numerical results provided a useful way to evaluate bonding quality by measuring the group velocity and attenuation in the pipelines.

ULTRASONIC GUIDED WAVES FOR THE INSPECTION OF ADHESIVELY BONDED JOINTS

2008 ◽  
Author(s):  
Padma Kumar Puthillath ◽  
Fei Yan ◽  
Clifford J. Lissenden ◽  
Joseph L. Rose ◽  
Donald O. Thompson ◽  
...  
Keyword(s):  
Guided Waves ◽  
Ultrasonic Guided Waves ◽  
Bonded Joints ◽  
Adhesively Bonded ◽  
Adhesively Bonded Joints
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