scholarly journals Experimental study of guided waves propagation characteristics under the changing temperatures

2018 ◽  
Vol 20 ◽  
pp. 208-212
Author(s):  
Lei Qiu ◽  
Xixi Yan ◽  
Shenfang Yuan
Keyword(s):  
Experimental Study ◽  
Guided Waves ◽  
Propagation Characteristics ◽  
Waves Propagation

Effect of Pipe Bend Configuration on Guided Waves-Based Defects Detection: An Experimental Study

2015 ◽  
Vol 138 (2) ◽  
Author(s):  
Jing Ni ◽  
Shaoping Zhou ◽  
Pugen Zhang ◽  
Yong Li
Keyword(s):  
Experimental Study ◽  
Defect Detection ◽  
Guided Waves ◽  
Fe Simulation ◽  
Ultrasonic Guided Waves ◽  
Detection Sensitivity ◽  
Pipe Bend ◽  
Simulation And Experiment ◽  
Testing Techniques ◽  
Waves Propagation

Ultrasonic guided waves is one of the most effective nondestructive testing techniques, which has been successfully applied for damage detection and evaluation of piping components. However, research about defects detection for pipelines with multiple bends is still limited. In this paper, effect of pipe bend arrangement on guided waves-based defect detection is investigated by experimental method, in which different configurations including space-Z type, U type, and plane-Z type are considered, respectively. Finite element (FE) simulation is used to explore the propagation behaviors of axisymmetric L (0, 2) mode in different bend configurations. On this basis, the detection sensitivity for different crack locations is experimentally investigated. Simulation and experiment results reveal that feature of guided waves propagation across the first and the second bend is totally different, and the defect detection sensitivity in the second bend is different from that in the first bend.

Experimental study of wave propagation characteristics on a simplified coral reef

2019 ◽  
Vol 32 (2) ◽  
pp. 385-397 ◽  
Author(s):  
Jia-yi Xu ◽  
Shu-xue Liu ◽  
Jin-xuan Li ◽  
Wei Jia
Keyword(s):  
Experimental Study ◽  
Wave Propagation ◽  
Coral Reef ◽  
Propagation Characteristics

Defect Localization for Pressure Vessel Based on Circumferential Guided Waves: An Experimental Study

2018 ◽  
Author(s):  
Shuangmiao Zhai ◽  
Chaofeng Chen ◽  
Gangyi Hu ◽  
Shaoping Zhou
Keyword(s):  
Pressure Vessel ◽  
Guided Waves ◽  
Pressure Vessels ◽  
Guided Wave ◽  
Normal Operation ◽  
Propagation Characteristics ◽  
Dense Array ◽  
Imaging Algorithm ◽  
Sparse Array ◽  
Damage Imaging

Pressure vessels are normally employed under extreme environments with high temperature and high pressure. Inevitably, the defects like crack and corrosion that easily occur in the equipment and can significantly influence the normal operation. Guided wave-based method is a cost-effective means to measure the utility of pressure vessel. In this paper, finite element (FE) simulation is used to explore the propagation characteristics of circumferential guided waves in pressure vessel. Based on the propagation characteristics, the experiments with different configurations of piezoelectric transducers (PETs), which contain a sparse array and a dense array, have been conducted on pressure vessel respectively. Different imaging methods, including discrete ellipse imaging algorithm and probability damage imaging algorithm have been applied to locate the defect based on the configurations above. Furthermore, a multi-channel ultrasonic guided wave detection system has been set up for pressure vessel inspection. The experimental results show that the sparse array with the discrete ellipse imaging algorithm can locate the defect effectively. The imaging results based on probability damage imaging algorithm show that the dense array presents the better localization result.

scholarly journals Effects of Concrete on Propagation Characteristics of Guided Wave in Steel Bar Embedded in Concrete

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Zhupeng Zheng ◽  
Ying Lei
Keyword(s):  
Large Scale ◽  
Guided Waves ◽  
Density Ratio ◽  
Guided Wave ◽  
Wave Number ◽  
Propagation Characteristics ◽  
Civil Infrastructures ◽  
Steel Bar ◽  
Reinforced Concrete Member ◽  
Steel Bars

Techniques based on ultrasonic guided waves (UGWs) play important roles in the structural health monitoring (SHM) of large-scale civil infrastructures. In this paper, dispersion equations of longitudinal wave propagation in reinforced concrete member are investigated for the purpose of monitoring steels embedded in concrete. For a steel bar embedded in concrete, not the velocity but the attenuation dispersion curves will be affected by the concrete. The effects of steel-to-concrete shear modulus ratio, density ratio, and Poisson’s ratio on propagation characteristics of guided wave in steel bar embedded in concrete were studied by the analysis of the real and imaginary parts of the wave number. The attenuation characteristics of guided waves of steel bar in different conditions including different bar concrete constraint and different diameter of steel bar are also analyzed. Studies of the influence of concrete on propagation characteristics of guided wave in steel bars embedded in concrete will increase the accuracy in judging the structure integrity and promote the level of defect detection for the steel bars embedded in concrete.

scholarly journals Experimental Study of Lamb Waves Propagation inside an Impact Damage in the Size of the Used Wavelength

2020 ◽  
Vol 56 (2) ◽  
pp. 141-150
Author(s):  
S. Taleb ◽  
L. Rittmeier ◽  
M. Sinapius ◽  
F. Boubenider ◽  
D. Schmidt
Keyword(s):  
Experimental Study ◽  
Lamb Waves ◽  
Impact Damage ◽  
Waves Propagation
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