Transient Ultrasonic Guided Waves in Bi-Layered Anisotropic Plates with Rectangular Cross Section

2004 ◽  
Author(s):  
O. M. Mukdadi
Keyword(s):  
Cross Section ◽  
Guided Waves ◽  
Rectangular Cross Section ◽  
Ultrasonic Guided Waves ◽  
Anisotropic Plates

Elastic Guided Waves in a Layered Plate With a Rectangular Cross Section

2002 ◽  
Vol 124 (3) ◽  
pp. 319-325 ◽  
Author(s):  
O. M. Mukdadi ◽  
S. K. Datta ◽  
M. L. Dunn
Keyword(s):  
Cross Section ◽  
Guided Waves ◽  
Rectangular Cross Section ◽  
Ultrasonic Guided Waves ◽  
Finite Width ◽  
Phonon Modes ◽  
Anisotropic Plates ◽  
One Dimensional ◽  
Number Of Layers ◽  
Propagating Waves

Ultrasonic guided waves in a layered elastic plate of rectangular cross section (finite width and thickness) are studied in this paper. A semi-analytical finite element method in which the deformation of the cross section is modeled by two-dimensional finite elements and analytical representation of propagating waves along the long dimension of the plate is used. The method is applicable to an arbitrary number of layers of anisotropic properties and is similar to that used earlier to study guided waves in layered anisotropic plates of infinite width. Numerical results are presented for acoustic phonon modes of quasi-one-dimensional (QID) wires. For homogeneous wires, these agree well with recently reported results for dispersion of these modes.

Elastic guided waves in a layered plate with rectangular cross section

2002 ◽  
Vol 112 (5) ◽  
pp. 1766-1779 ◽  
Author(s):  
O. M. Mukdadi ◽  
Y. M. Desai ◽  
S. K. Datta ◽  
A. H. Shah ◽  
A. J. Niklasson
Keyword(s):  
Cross Section ◽  
Guided Waves ◽  
Rectangular Cross Section ◽  
Layered Plate

The Characterization of Guided Waves on Hollow Cylinder From Non-Axisymmetric End Loading

2005 ◽  
Author(s):  
Longtao Li ◽  
Cunfu He ◽  
Bin Wu ◽  
Ying Li ◽  
Xiuyan Wang
Keyword(s):  
Hollow Cylinder ◽  
Cross Section ◽  
Guided Waves ◽  
Axial Direction ◽  
Guided Wave ◽  
Ultrasonic Guided Waves ◽  
Steel Pipe ◽  
Rapid Testing ◽  
Middle Point

Ultrasonic guided waves are used for the rapid testing of a steel pipe (O.D 70 mm, I.D 63 mm, 2544 mm long). The non-axisymmetric transducer ring (arc) is put on one end of the pipe to excite and receive the guided wave in the pipe. An artificial hole of 1 mm diameter can not be found by conventional axisymmetric end loading transducer. However, the non-axisymmetric transducer ring (arc), compared with the axisymmetric transducer ring, is very sensitive to the artificial hole when The middle point (MP) of the transducer arcs coincided with the center of the artificial hole on the cross section of the pipe. The results show that the non-axisymmetric end loading technology can locate the crack or defect on the pipe not only in the axial direction but also in the circumferential direction.

Propagation of Ultrasonic Shear Horizontal Waves in Rectangular Waveguides

2016 ◽  
Vol 16 (08) ◽  
pp. 1550041 ◽  
Author(s):  
Rymantas Kažys ◽  
Egidijus Žukauskas ◽  
Liudas Mažeika ◽  
Renaldas Raišutis
Keyword(s):  
Finite Element ◽  
Cross Section ◽  
Guided Waves ◽  
Rectangular Cross Section ◽  
Finite Width ◽  
Horizontal Wave ◽  
Rectangular Waveguides ◽  
Pulse Type ◽  
Ultrasonic Shear ◽  
Shear Horizontal

The aim of this paper is to investigate the propagation of ultrasonic shear horizontal guided waves along waveguides with a rectangular cross-section and with a finite constant and variable width and to determine the peculiarities of propagation of those waves. The dispersion curves of guided waves in finite-width waveguides were modeled by using a semi-analytical finite element (SAFE) technique. The propagation of pulsed shear horizontal ultrasonic guided waves was investigated numerically by using 3D finite element modeling. It was found that in the case of finite-width waveguides, the SH0 shear horizontal wave splits into a family of SH-type dispersive modes propagating with different phase velocities. It was also found that the number of propagating modes depends on the width-to-thickness ratio. The first time spatial distributions of pulsed displacements across the waveguide were determined for waveguides of different widths. Investigation of the waveguides with a rectangular cross-section and varying lateral dimensions was performed. It was found that by properly selecting the geometry of the transient zone of waveguides with a rectangular cross-section, it is possible to improve the performance of such waveguides, e.g. to increase the amplitude of the transmitted pulse type signal without significant distortions of the waveforms.

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