Ultrasonic shear wave birefringence as a test of homogeneous elastic anisotropy

1973 ◽  
Vol 78 (32) ◽  
pp. 7623-7629 ◽  
Author(s):  
Stephen E. Tilmann ◽  
Hugh F. Bennett
Keyword(s):  
Shear Wave ◽  
Elastic Anisotropy ◽  
Ultrasonic Shear

Effective muscle elongation positions for the neck extensor muscles: An ultrasonic shear wave elastography study

2021 ◽  
pp. 102569
Author(s):  
Ko Yanase ◽  
Tome Ikezoe ◽  
Masatoshi Nakamura ◽  
Junya Saeki ◽  
Masahide Yagi ◽  
...  
Keyword(s):  
Shear Wave ◽  
Shear Wave Elastography ◽  
Extensor Muscles ◽  
Ultrasonic Shear

Evaluation of 3D shear-wave anisotropy based on elastic-wave velocity variations around the borehole

Geophysics ◽  
2021 ◽  
pp. 1-47
Author(s):  
Song Xu ◽  
Xiao-Ming Tang ◽  
Carlos Torres-Verdín ◽  
Zhen Li ◽  
Yuanda Su
Keyword(s):  
Shear Wave ◽  
Elastic Anisotropy ◽  
Anisotropy Parameter ◽  
Primary Source ◽  
Shear Velocity ◽  
Fracture Network ◽  
Elastic Wave Velocity ◽  
Azimuthal Anisotropy ◽  
Conventional Procedure ◽  
Radial Anisotropy

Aligned fractures/cracks in rocks are a primary source of elastic anisotropy. In an azimuthally anisotropic formation surrounding a borehole, shear waves split into fast and slow waves that propagate along the borehole and are recorded by a borehole logging tool. However, when the formation has conjugate fractures with orthogonal strike directions, the azimuthal anisotropy vanishes. Hence, azimuthal anisotropy measurements may not be adequate to detect orthogonal fracture sets. We develop a method for obtaining azimuthal and radial shear-wave anisotropy parameters simultaneously from four-component array waveforms. The method utilizes a velocity tomogram around the borehole. Azimuthal and radial anisotropy were determined by integrating shear velocity radiation profile along the radial direction at different azimuthal angles. Results indicate that this approach is reliable for estimating anisotropy properties in aligned crack systems. The advantage of this interpretation method is shown in multiple conjugate crack systems. Field data processing examples are used to verify the application of the proposed technique. Comparison of results against those obtained with a conventional procedure shows that the new method can not only provide estimates of azimuthal anisotropy, but also of the radial anisotropy parameter, which is important in fracture network evaluation.

Measurement of Ultrasonic Shear Wave Amplitude Using Raman-Nath Parameter

1987 ◽  
Vol 26 (S1) ◽  
pp. 247
Author(s):  
Hiroki Kojoh ◽  
Kazuo Arakawa ◽  
Kiyoshi Takahashi ◽  
Satoshi Nagai
Keyword(s):  
Shear Wave ◽  
Wave Amplitude ◽  
Ultrasonic Shear

Numerical Simulation of Ultrasonic Shear Wave Propagation Based on the Finite Element Method

2014 ◽  
Vol 488-489 ◽  
pp. 926-929 ◽  
Author(s):  
Jian Ma ◽  
Yang Zhao ◽  
Ji Hua Sun ◽  
Shuai Liu
Keyword(s):  
Numerical Simulation ◽  
Shear Wave ◽  
Present Method ◽  
Steel Plate ◽  
Mode Conversion ◽  
Simulation Method ◽  
The Finite Element Method ◽  
Propagation Process ◽  
The Time Domain ◽  
Ultrasonic Shear

The present paper provided a kind of numerical simulation method which was employed to guide the process of ultrasonic nondestructive testing and analyze the inspection results. The simulation concerning the propagation process of shear wave in the steel plate was carried out using the ANSYS, according to the mechanism of ultrasonic mode conversion. Then, the frequency, velocity and refraction angle were extracted from the time-domain date in order to verify the simulation. It is found that the result of simulation agrees well with the theoretical one, which shows that the present method is correct and reliable.

Quantification of Kidney Fibrosis Using Ultrasonic Shear Wave Elastography

2015 ◽  
Vol 34 (5) ◽  
pp. 869-877 ◽  
Author(s):  
Sung Kyoung Moon ◽  
Sang Yoon Kim ◽  
Jeong Yeon Cho ◽  
Seung Hyup Kim
Keyword(s):  
Shear Wave ◽  
Shear Wave Elastography ◽  
Kidney Fibrosis ◽  
Ultrasonic Shear

Experimental Research and Application of UT Inspection Method for Detection of Defects on Pressure Vessels and Pipelines Under High-Temperature Environment

2006 ◽  
Author(s):  
Weihe Guan ◽  
Changzhou Yan ◽  
Yuanhong Tao ◽  
Xuedong Chen
Keyword(s):  
High Temperature ◽  
Sound Velocity ◽  
Shear Wave ◽  
Room Temperature ◽  
Pressure Vessels ◽  
Inspection Time ◽  
Inspection Method ◽  
Temperature Environment ◽  
Ultrasonic Shear ◽  
High Temperature Environment

High temperature UT inspection techniques can be used to conduct random inspection on line on the key locations of pressure vessels and pipelines in operation so as to find out fresh defects in time and determine inspection time. It can also be used for real-time monitoring and control of defect-containing pressure vessels and pipelines and provide a basis for safety assessment of equipment so as to ensure safe operation of pressure vessels and pipelines. The propagation velocity of ultrasonic wave in metallic pressure-bearing equipment and its amplitude vary with temperature, therefore, the factors that influence UT inspection ability and measuring accuracy will be increased. In this paper the variation in sound velocity and attenuation law of ultrasonic shear wave in common pressure vessels and pipelines in the range of room temperature ∼ 450 °C is studied, the sound velocity decreases linearly as temperature rises and the attenuation coefficient α decreases as temperature rises, from 0.006 dB/mm at room temperature to 0.08dB/mm at 450 °C. The factors that influence inspection accuracy of ultrasonic shear wave are discussed, including variation in sound velocity, loss in interface sound pressure, thermal expansion, and so forth. The method for detection of weld defects within above temperature range using the ultrasonic shear wave is established, including scanning manner, measurement of defect height and length and their position correction, and so forth. The present situation of online high-temperature UT inspection technology for pressure vessels and pipelines in China is summarized through online UT inspection examples of petrochemical equipment under local high-temperature environment.

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