scholarly journals Directional nonlinear guided wave mixing: Case study of counter-propagating shear horizontal waves

2018 ◽  
Author(s):  
Mostafa Hasanian ◽  
Cliff J. Lissenden
Keyword(s):  
Guided Wave ◽  
Wave Mixing ◽  
Propagating Shear ◽  
Shear Horizontal ◽  
Nonlinear Guided Wave

scholarly journals Nonlinear Guided Wave Mixing for Localized Material State Characterization

2015 ◽  
Vol 70 ◽  
pp. 668-671 ◽  
Author(s):  
Cliff J. Lissenden ◽  
Yang Liu ◽  
Vamshi K. Chillara ◽  
Gloria Choi ◽  
Hwanjeong Cho
Keyword(s):  
Guided Wave ◽  
Wave Mixing ◽  
Material State ◽  
Nonlinear Guided Wave

scholarly journals Nonlinear Guided-Wave Mixing for Condition Monitoring of Bolted Joints

Sensors ◽  
2021 ◽  
Vol 21 (15) ◽  
pp. 5093
Author(s):  
Juan Carlos Pineda Allen ◽  
Ching Tai Ng
Keyword(s):  
Lamb Wave ◽  
Guided Wave ◽  
Bolted Joints ◽  
Theoretical Development ◽  
Structural Safety ◽  
Engineering Practice ◽  
Wave Mixing ◽  
Time Duration ◽  
Applied Torque ◽  
Nonlinear Guided Wave

Bolted joints are fundamental to numerous structural components in engineering practice. Nevertheless, their failure or even their loosening can lead to insufficient performance and reduced structural safety. This study presents a theoretical development and experimental investigation into nonlinear guided-wave mixing for integrity monitoring of bolted joints in plates. Combinational harmonics generated due to nonlinear Lamb wave mixing and contact acoustic nonlinearity at the bolted joints were used to evaluate the applied torque level in the joint. The area of the power spectral density in the region of the sum combinational harmonic bandwidth is found to be highly correlated to the applied torque level at the joint. Moreover, the effect of the number of cycles and thus the time duration of the excitation is investigated. The results show that the combinational harmonics remain robust for different numbers of cycles in detecting bolt loosening. The findings presented in this study also provide physical insight into the phenomena of nonlinear Lamb wave mixing for evaluating applied torque in bolted joints, and the results help further advance the use of nonlinear guided waves for damage detection.

Circumference Damage Identification in a Pipe Using Mode Conversion of Longitudinal Guided Wave

2013 ◽  
Vol 395-396 ◽  
pp. 787-791
Author(s):  
Jing Wu ◽  
Wei Wei Zhang
Keyword(s):  
Damage Detection ◽  
Damage Identification ◽  
Mode Conversion ◽  
Guided Wave ◽  
Symmetric Mode ◽  
Axially Symmetric ◽  
Mode Transformation ◽  
Damage Location

This paper aims to develop a method to identify the damage location in circumference direction of a pipe using mode transformation of longitudinal guided wave. The corrosion-like damage in bimetal pipe is considered. Case study that damage detection for a bimetal pipe is used to show the validity and advantage of the proposed method. It can be found that the axially symmetric mode guided wave encounter the damage and the three modes were received in reflection. The damage location in circumferential directions could be identified by conversed modes measured at one position. The simulation shows a good performance.

Detection of Defects in Titanium Using Shear Horizontal Guided Waves

2021 ◽  
Author(s):  
Christian Peyton ◽  
Rachel S. Edwards ◽  
Steve Dixon ◽  
Ben Dutton ◽  
Wilson Vesga
Keyword(s):  
Guided Waves ◽  
Wave Mode ◽  
Guided Wave ◽  
Inspection System ◽  
Wave Direction ◽  
Finite Element Software ◽  
Small Defect ◽  
Back Face ◽  
The Relationship ◽  
Shear Horizontal

Abstract This paper investigates the interaction behaviour between the fundamental shear horizontal guided wave mode and small defects, in order to understand and develop an improved inspection system for titanium samples. In this work, an extensive range of defect sizes have been simulated using finite element software. The SH0 reflection from a defect has been shown previously to depend on its length as the total reflection consists of reflections from both the front and back face. However, for small defect widths, this work has found that the width also affects this interference, changing the length at which the reflection is largest. In addition, the paper looks at how the size of the defect affects the mode converted S0 reflection and SH0 diffraction. The relationship between the SH0 diffraction and defect size is shown to be more complex compared to the reflections. The mode converted S0 reflection occurs at an angle to the incident wave direction; therefore, the most suitable angle for the detection has been found. Simultaneous measurement of multiple waves would bring benefits to inspection.

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