Effect of intracortical bone properties on the guided wave propagation using low-frequency axial transmission technique: Simulation study

2016 ◽  
Vol 140 (4) ◽  
pp. 3188-3189
Author(s):  
Daniel Pereira ◽  
Guillaume Haïat ◽  
Julio Fernandes ◽  
Pierre Belanger
Keyword(s):  
Wave Propagation ◽  
Simulation Study ◽  
Low Frequency ◽  
Guided Wave ◽  
Transmission Technique ◽  
Bone Properties ◽  
Guided Wave Propagation ◽  
Axial Transmission

scholarly journals Experimental and numerical evaluation on debonding of fully grouted rockbolt under pull-out loading

2021 ◽  
Author(s):  
Shuisheng Yu ◽  
Wancheng Zhu ◽  
Leilei Niu
Keyword(s):  
Wave Propagation ◽  
Amplitude Ratio ◽  
Country Rock ◽  
Low Frequency ◽  
Axial Loading ◽  
Signal Amplitude ◽  
Guided Wave ◽  
Pull Out ◽  
Ultrasonic Guided Wave ◽  
Guided Wave Propagation

Abstract The axial loading in rockbolts changes due to stress redistribution and rheology in the country rock mass. Such a change may lead to debonding at rockbolt to grout interface or rupture of the rockbolt. In this study, based on laboratory experiments, ultrasonic guided wave propagation in fully grouted rockbolt under different pull-out loads was investigated in order to examine the resultant debonding of rockbolt. The signals obtained from the ultrasonic monitoring during the pull-out test were processed using wavelet multi-scale analysis and frequency spectrum analysis, the signal amplitude and the amplitude ratio (Q) of low frequency to high frequency were defined to quantify the debonding of rockbolt. In addition to the laboratory test, numerical simulation on the effect of the embedment lengths on ultrasonic guided wave propagation in rockbolt was conducted by using a damage-based model, and the debonding between rockbolt and cement mortar was numerically examined. It was confirmed that the ultrasonic guided wave propagation in rockbolt was very sensitive to the debonding because of pull-out load, therefore, the critical bond length could be calculated based on the propagation of guided wave in the grouted rockbolt. In time domain, the signal amplitude in rockbolt increased with pull-out load from 0 kN to 100 kN until the completely debonding, thus quantifying the debonding under the different pull-out loads. In the frequency domain, as the Q value increased, the debonding length of rockbolt decreased exponentially. The numerical results confirmed that the guided wave propagation in the fully grouted rockbolt was effective in detecting and quantifying the debonding of rockbolt under pull-out load.

Manipulation of the guided wave propagation in multilayered phononic plates by introducing interface delaminations

2021 ◽  
pp. 104266
Author(s):  
Yanzheng Wang ◽  
Elias Perras ◽  
Mikhail V. Golub ◽  
Sergey I. Fomenko ◽  
Chuanzeng Zhang ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Guided Wave ◽  
Guided Wave Propagation
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