Elastic Property Measurement of High-Tension Bolt Based on Mode Converted Ultrasound

Elastic properties of high tension bolt are evaluated non-destructively by measuring acoustic longitudinal and shear wave velocities using mode-converted ultrasound. Mode-converted longitudinal and shear waves along bolt are captured to calculate acoustic wave velocities and determine elastic constants such as Young’s modulus and Bulk modulus based on acoustoelasticity. Ray analysis to select a specific mode conversion from longitudinal mode to shear mode is carried out and discussed with experimental results. From experiment results of maximum 5% of measurement error, it is shown that the proposed mode-converted ultrasonic technique is very effective and sensitive enough to characterize mechanical modulus of high-tension bolts quantitatively.

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Ultrasonic Measurement of Elastic Properties of Nanostructured Alumina

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.321-323.1711 ◽

2006 ◽

Vol 321-323 ◽

pp. 1711-1714 ◽

Cited By ~ 1

Author(s):

Noh Yu Kim ◽

Hee Joon Kim ◽

Se Woong Oh ◽

N. Hozumi ◽

Cheol Kyou Lee ◽

...

Keyword(s):

Elastic Moduli ◽

Ultrasonic Measurement ◽

Nano Particles ◽

Acoustic Microscope ◽

Al2o3 Powder ◽

Wave Velocities ◽

Shear Wave Velocities ◽

Longitudinal And Shear Waves ◽

Scanning Acoustic Microscope ◽

Mechanical Modulus

In this paper, elastic moduli of nanostructured alumina are evaluated by simultaneous measurement of longitudinal and shear wave velocities using mode-converted ultrasound in scanning acoustic microscope (SAM). Mode-converted longitudinal and shear waves inside alumina sample are captured to calculate acoustic wave velocities and determine elastic constants such as Young’s modulus and Bulk modulus. Al2O3 nanostructured alumina samples are formed by compacting micro-sized Al2O3 powder with nano-sized Al2O3 powder from 10wt% to 50wt%, and tested by SAM to investigate elastic moduli. A correlation is found from experiment that the more percentage of nano-particles are added, the higher elastic moduli are obtained. It is also shown that the mode-converted ultrasound is sensitive enough to characterize mechanical modulus of nanostructured alumina quantitatively.

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VSP measurement of shear‐wave velocities in consolidated and poorly consolidated formations

Geophysics ◽

10.1190/1.1443226 ◽

1992 ◽

Vol 57 (12) ◽

pp. 1583-1592 ◽

Cited By ~ 4

Author(s):

John O’Brien

Keyword(s):

Shear Wave ◽

Poisson’S Ratio ◽

Mode Conversion ◽

Shear Waves ◽

Vertical Motion ◽

Seismic Source ◽

Poisson's Ratio ◽

The Arctic ◽

Wave Velocities ◽

Shear Wave Velocities

Mode conversion in the subsurface can generate shear waves with sufficient amplitude so that they can be used to measure shear‐wave propagation effects. Significant mode conversion can occur even at near vertical incidence if there is sufficient contrast in Poisson’s ratio across the interface. This can be exploited to measure shear‐wave velocities in the underlying section in the course of vertical seismic profile (VSP) acquisition. The technique is effective even in poorly consolidated formations with low shear‐wave velocities where sonic waveform logging fails. Where shear‐wave velocity data are available from sonic waveform logs, the VSP data can be used to verify the wireline data and to calibrate these data to seismic frequencies. The technique is illustrated with a case study from the North Slope, Alaska, in which several shear‐wave events are observed propagating downward through the subsurface. The seismic source is a vertical‐motion vibrator; shear waves are generated via mode conversion in the subsurface and also radiated from the source at the surface, and they are observed with both far‐ and near‐source offsets. The shear‐wave events are strong even on the near‐offset data, which is attributed to the contrast in Poisson’s ratio at the interfaces where mode conversion occurs. The technique is not limited to the hard surfaces of the Arctic and should work in any well, either land or marine, that penetrates shallow interfaces where mode conversion can occur.

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Ultrasonic attenuation anomalies of n-type superconductor Pr2−xCexCuO4

Modern Physics Letters B ◽

10.1142/s0217984916503140 ◽

2016 ◽

Vol 30 (23) ◽

pp. 1650314 ◽

Cited By ~ 1

Author(s):

Tet Vui Chong ◽

R. Abd-Shukor

Keyword(s):

Critical Temperature ◽

Ultrasonic Attenuation ◽

Magnetic Transition ◽

Longitudinal Mode ◽

Shear Mode ◽

Longitudinal And Shear Waves ◽

Temperature Dependences ◽

Overlap Method ◽

Pulse Echo ◽

Mode A

Pr[Formula: see text]Ce[Formula: see text]CuO4 ([Formula: see text] = 0 and 0.15) samples were prepared via solid state reaction. Pr2CuO4 sample is insulating while Pr[Formula: see text]Ce[Formula: see text]CuO4 sample exhibited an onset critical temperature, [Formula: see text] of 21 K. The temperature dependences of ultrasonic attenuation in these polycrystalline n-type superconductor Pr[Formula: see text]Ce[Formula: see text]CuO4 ([Formula: see text] = 0 and 0.15) samples have been measured between 80 K and 300 K using longitudinal and shear waves by pulse-echo-overlap method with frequencies between 5 MHz and 10 MHz. For the longitudinal mode, a pronounced attenuation peak around 200 K was observed in Pr2CuO4, but it is not observed in the superconducting material Pr[Formula: see text]Ce[Formula: see text]CuO4. For the shear mode, no pronounced attenuation peaks were observed in the samples. It is suggested that the attenuation peak in the [Formula: see text] = 0 sample at 200 K is due to the weak structural distortion induced by the magnetic transition.

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THE MEASUREMENT OF SHEAR‐WAVE VELOCITIES IN SOLIDS USING AXIALLY POLARIZED CERAMIC TRANSDUCERS

Geophysics ◽

10.1190/1.1439152 ◽

1963 ◽

Vol 28 (1) ◽

pp. 87-90 ◽

Cited By ~ 8

Author(s):

John C. Jamieson ◽

Hartley Hoskins

Keyword(s):

Wave Propagation ◽

Shear Wave ◽

Excellent Agreement ◽

Elastic Constants ◽

Convenient Method ◽

High Frequency ◽

Critical Angle ◽

Mode Conversion ◽

Wave Velocities ◽

Shear Wave Velocities

A double mode conversion obtained by critical‐angle reflection allows the velocity of shear‐wave propagation to be determined using longitudinally polarized ceramic discs. This method provides a simple and convenient method of obtaining high‐frequency shear waves of predeterminable polarization in the laboratory. Elastic constants of brass and Pyrex obtained with this method are in excellent agreement with those measured by the PnSP method of Hughes. This mode conversion technique, unlike the PnSP method, can be used on anisotropic materials of noncylindrical geometries.

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Study of the dependence of the strength characteristics of metals on variations in the modes of manufacturing process using microstructure-sensitive acoustic parameters

Industrial laboratory Diagnostics of materials ◽

10.26896/1028-6861-2021-87-10-26-33 ◽

2021 ◽

Vol 87 (10) ◽

pp. 26-33

Author(s):

A. V. Kamyshev ◽

L. A. Pasmanik ◽

A. V. Radostin ◽

V. Yu. Zaitsev

Keyword(s):

Pulse Method ◽

Structural Features ◽

Strength Characteristics ◽

Propagation Time ◽

Acoustic Parameters ◽

Entire Volume ◽

Wave Velocities ◽

Shear Wave Velocities ◽

Longitudinal And Shear Waves ◽

Echo Pulse

The microstructure-sensitive acoustic parameters (MSA parameters) of metal of the object under control are determined using measurements of the propagation time of bulk elastic waves of the ultrasonic range by the echo-pulse method. The structural features of the metal are thus evaluated not only in the surface layer, but also throughout the entire volume. We present the results of practical application of the MSA-parameters to estimation of the deviation of the velocity ratios of longitudinal and shear waves relative to the «basic» state with known strength characteristics. A correlation of the MSA-parameters with variations in the elastic moduli of metals attributed to modification of their microstructure is discussed. The generalized values of the ratios of wave velocities for steels of the same group are used in calculations to characterize the «base» state. It is shown that when calculating the MSA-parameters for a certain kind of construction steel, it is possible to use the averaged ratios of the velocities measured for quasi-isotropic reference samples made of the same type of steel. The generalized baseline ratios of the longitudinal and shear wave velocities are determined for the samples made of carbon steel, low-alloy, and alloyed steels. We present experimental evidence of using MSA-parameters to detect microstructural changes in metal samples and accompanying changes in their strength characteristics that occur during changes in modes and conditions of welding and heat treatment. A comparative analysis of the MSA parameters with the values of the mechanical properties and parameters of the crack resistance of the metal is carried out. It was shown that the accuracy of measuring the MCA parameters provided by modern hardware significantly exceeds changes in them occurred under significant deviations of the strength characteristics. The experimental results obtained clearly indicate that the MSA-parameters can be successfully used to improve the methods of quantitative non-destructive assessment of the features of metal microstructures

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Determine Shear wave velocities and Elasto-Dynamic properties for Nassiriya Refinery project in Thi qar Governorate- Nassiriya District- South of Iraq

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/790/1/012005 ◽

2021 ◽

Vol 790 (1) ◽

pp. 012005

Author(s):

Ahmed Jalal Fakher ◽

Ahmed Salman Hassan

Keyword(s):

Shear Wave ◽

Dynamic Properties ◽

Wave Velocities ◽

Shear Wave Velocities ◽

South Of Iraq

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Longitudinal Guided Wave Inspection of Small-Diameter Elbowed Steel Tubes with a Novel Squirrel-Cage Magnetostrictive Sensor

Journal of Sensors ◽

10.1155/2019/3027372 ◽

2019 ◽

Vol 2019 ◽

pp. 1-9

Author(s):

Yao Liu ◽

Xiucheng Liu ◽

Chehua Yang ◽

Wenxin Guo ◽

Bin Wu ◽

...

Keyword(s):

Finite Element ◽

Guided Waves ◽

Mode Conversion ◽

Small Diameter ◽

Longitudinal Mode ◽

Guided Wave ◽

Wall Defect ◽

Squirrel Cage ◽

Simulation Results ◽

Magnetostrictive Sensor

In the study, ultrasonic longitudinal mode guided waves were employed to detect defects in elbowed tubes (without welds) with a diameter of 10 mm. Finite element simulation results highlighted that the emitted L(0,1) mode guided waves experienced strong reflection and mode conversion at the elbow region to generate F(1,1) mode, followed by slow and weak F(2,1) mode. The guided wave reflected from the elbow with a through-wall defect was manifested as two overlapped wave packets, which were good indicators of a defective elbow. To conduct L(0,1) mode guided waves inspection on the small-diameter elbowed tubes, a novel tailored squirrel-cage magnetostrictive sensor was employed in the experiment. The new sensor employed the configuration of segmental iron-cobalt strips and small-size permanent magnet arrays. The entire sensor is composed of two identical C-shaped sensor elements and can be recycled and installed conveniently. Experimental results obtained from healthy and defective tubes were consistent with the conclusions obtained from finite element simulations. An artificial through-wall defect at the elbow and a notch defect at the straight part of the tube could be simultaneously detected by L(0,1) mode guided waves through comparing experimental signals with simulation results.

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