Feasibility study of detecting the end contacting status of threaded-sleeve-connected reinforcing bar using magnetostrictive guided wave

2020 ◽  
Vol 64 (1-4) ◽  
pp. 557-564
Author(s):  
Chaoyue Hu ◽  
Jiang Xu ◽  
Yunfei Li
Keyword(s):  
Feasibility Study ◽  
Propagation Characteristic ◽  
Guided Wave ◽  
Peak Voltage ◽  
Reflection And Transmission ◽  
Reinforcing Bar ◽  
Exciting Frequency

The reinforcing bar connected by threaded sleeve is widely used. The end contacting status under the sleeve indicates the tightness of the threaded sleeve connection. In this paper, the feasibility of using magnetostrictive guided wave to detect the end contacting status of the reinforcing bar is studied. Firstly, the propagation characteristic of the wave propagating through the threaded sleeve connection is analyzed. The end contacting status affects the reflection and transmission of the wave. Then, experiments are carried out on a thread-sleeve-connected reinforcing bar. The passing signals of the threaded sleeve connection at an exciting frequency of 30 kHz can be used to distinguish end contacting status of the reinforcing bar. Additionally, the peak voltage of the passing signal’s first passing wave decreases with the increasing loosening angle of the threaded sleeve connection. The study proves the feasibility of detecting the end contacting status using magnetostrictive guided wave.

A feasibility study of detecting reinforcing-bar debonding by acoustic-emission technique

1980 ◽  
Vol 20 (9) ◽  
pp. 301-308 ◽  
Author(s):  
A. S. Kobayashi ◽  
N. M. Hawkins ◽  
Y-L A. Chan ◽  
I-J Lin
Keyword(s):  
Acoustic Emission ◽  
Feasibility Study ◽  
Acoustic Emission Technique ◽  
Reinforcing Bar

A Feasibility Study on Guided Wave- Based Robotic Mapping

2019 ◽  
Author(s):  
Morteza Tabatabaeipour ◽  
Oksana Trushkevych ◽  
Gordon Dobie ◽  
Rachel S. Edwards ◽  
Steven Dixon ◽  
...  
Keyword(s):  
Feasibility Study ◽  
Guided Wave ◽  
Robotic Mapping

Defect Imaging via Chirp Signal Excitation in Plate

2013 ◽  
Vol 846-847 ◽  
pp. 826-830
Author(s):  
Hong Lei Chen ◽  
Fei Deng ◽  
Xi Zhang
Keyword(s):  
Detection System ◽  
Tone Burst ◽  
Wave Mode ◽  
Guided Wave ◽  
Imaging Method ◽  
Chirp Signal ◽  
Imaging Results ◽  
Exciting Frequency ◽  
Hole Defect ◽  
Defect Imaging

The chirp signal can bring some useful information for structural non-destructive evaluation (NDE) applications due to its broad frequency components with different sensitivity to defects that exist in test pieces. This paper introduces a defect imaging method based on the chirp signal. When a chirp signal is used as excitation in the guided wave detection system, tone burst results can be gotten from the response easily. Numerical simulation results show that this method simplifies the procedure to find the best exciting frequency and guided wave mode for the hole defect detection, and yields more accurate defect imaging results with arc imaging algorithm.

Analysis on Characteristic Features of L-Mode Guided Wave in Tube Testing

2012 ◽  
Vol 710 ◽  
pp. 581-587
Author(s):  
S. Adalarasu
Keyword(s):  
Dispersion Characteristic ◽  
Wave Structure ◽  
Propagation Characteristic ◽  
Guided Wave ◽  
Chemical Plants ◽  
Steam Generators ◽  
Power Generators ◽  
Longitudinal Modes ◽  
Multiple Defect ◽  
Characteristic Features

Applications of long range ultrasonic testing are on cylindrical products(pipes and tubes) and planar products(plates and sheets).Guided wave testing using circumferential and longitudinal modes are getting more and more importance as there are huge requirements for testing pipes and tubes in power generators, Chemical plants, steam generators etc.. There will be infinite number of modes with charectestic propagation and wave structure. This propagation characteristic and wave structure plays a major role in deciding its suitability for use in specific application. It is highly essential to use mode control and to understand the generated modes and its characteristics based on which only testing adequacy can be evaluated. In this paper the characteristic features of L-mode generated using a source design parameter for tube testing are explained. The dispersion characteristic of L-mode are discussed using constructed Dispersion Curves, phase and group velocity, its multiple defect detection capability, pulse shape and amplitude dynamics with propagation range and inclination. The details of controlled experiment conducted and the observations are discussed. The derived inferences are explained based on the applicable particle displacement equations and dispersion characteristic equations.

A Computational Tool for Defect Analysis in Rail with Ultrasonic Guided Waves

2006 ◽  
Vol 321-323 ◽  
pp. 784-787
Author(s):  
Chong Myoung Lee ◽  
Joseph L. Rose ◽  
Wei Luo ◽  
Youn Ho Cho
Keyword(s):  
Guided Waves ◽  
Wave Structure ◽  
Propagation Characteristic ◽  
Guided Wave ◽  
Bulk Wave ◽  
Transverse Cracks ◽  
Wave Technique ◽  
Multiple Defect ◽  
Important Means ◽  
Nondestructive Testing Methods

Rail represents one of the most important means of transportation. Many nondestructive testing methods have been used to find defects in rail. The guided wave technique is the most efficient because of its long propagation characteristic along the rail. Potential for detecting transverse cracks exists whereas standard bulk wave technique could miss the cracks. The wave structure of the rail cross-section for a particular loading condition of modes and frequencies is an important feature. In this paper, the propagation and scattering patterns of guided waves in a rail are studied using finite element methods. The wave structures are also examined. Various multiple defect situations and rail boundary conditions can also be studied.

Study of the Transmission of Ultrasonic Guided Wave at the Junction of Two Different Elastic Plates with the Presence of a Defect

2011 ◽  
Vol 482 ◽  
pp. 21-29
Author(s):  
Taoufiq Belhoussine Drissi ◽  
Bruno Morvan ◽  
Mihai Predoi ◽  
Jean Louis Izbicki ◽  
Pascal Pareige
Keyword(s):  
Lamb Waves ◽  
Guided Wave ◽  
Elastic Plates ◽  
The Finite Element Method ◽  
Reflection And Transmission ◽  
Modal Approach ◽  
Limit Value ◽  
Numerical Studies ◽  
Ultrasonic Guided Wave ◽  
Orthogonality Relations

We are interested in a right junction of two plates of different materials (aluminum and copper) placed in contact edge to edge. The aim of this study is the interaction of Lamb waves with a defect located at the junction. The reflection and transmission of the fundamental symmetrical S0 wave is analyzed. The theoretical coefficients of reflection and transmission are obtained by a multi-modal approach based on the orthogonality relations involving different modes. Using the Finite Element Method (FEM), we estimate the limit value of the ratio between the dimension of the defect and the thickness of the structure, for which the multi-modal approach is applicable. In experimental and numerical studies, it is also brought to light the effects of diffraction by the defect.

Experimental Feasibility Study for Guided Wave Propagation

PAMM ◽  
2009 ◽  
Vol 9 (1) ◽  
pp. 501-502
Author(s):  
Dominik Kern ◽  
Wolfgang Seemann
Keyword(s):  
Wave Propagation ◽  
Feasibility Study ◽  
Guided Wave ◽  
Guided Wave Propagation
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