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

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

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

2006 ◽  
Vol 326-328 ◽  
pp. 709-712
Author(s):  
Noh Yu Kim ◽  
Sang Soon Lee
Keyword(s):  
Mode Conversion ◽  
Longitudinal Mode ◽  
Shear Mode ◽  
Ultrasonic Technique ◽  
Wave Velocities ◽  
Shear Wave Velocities ◽  
High Tension ◽  
Longitudinal And Shear Waves ◽  
Property Measurement ◽  
Mechanical Modulus

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.

Ultrasonic Measurement of Elastic Properties of Nanostructured Alumina

2006 ◽  
Vol 321-323 ◽  
pp. 1711-1714 ◽  
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.

Sound Absorption Measurement in a Circular Tube Using the Echo-Pulse Method

2010 ◽  
Vol 96 (5) ◽  
pp. 973-976 ◽  
Author(s):  
Liang Sun ◽  
Hong Hou ◽  
Li-ying Dong ◽  
Fang-rong Wan
Keyword(s):  
Sound Absorption ◽  
Circular Tube ◽  
Pulse Method ◽  
Absorption Measurement ◽  
Echo Pulse

Soil moisture assessment by means of compressional and shear wave velocities: Theoretical analysis and experimental setup

Measurement ◽  
2010 ◽  
Vol 43 (3) ◽  
pp. 344-352 ◽  
Author(s):  
F. Adamo ◽  
F. Attivissimo ◽  
L. Fabbiano ◽  
N. Giaquinto ◽  
M. Spadavecchia
Keyword(s):  
Soil Moisture ◽  
Theoretical Analysis ◽  
Shear Wave ◽  
Experimental Setup ◽  
Wave Velocities ◽  
Shear Wave Velocities

scholarly journals Improvement of Accuracy of Control of Physical‑Mechanical Characteristics of Materials By Ultrasonic Pulse Method Due to Reduction of Measurement Error of Propagation Time of Elastic Waves

2018 ◽  
pp. 31-35
Author(s):  
Ya. Serikov
Keyword(s):  
Mechanical Characteristics ◽  
Pulse Method ◽  
Structural Heterogeneity ◽  
Ultrasonic Pulse ◽  
Ultrasonic Signal ◽  
Ultrasonic Transducers ◽  
Propagation Time ◽  
Information Signal ◽  
Pass Through ◽  
Definition Of

Ensuring the reliability of buildings, structures, analysis of their structural elements during reconstruction or major repair includes the task of determining the physical and mechanical characteristics of materials — strength, homogeneity, evaluation of structural heterogeneity, the presence of microcracks, etc. In solving this problem, an ultrasonic pulse method of non-destructive quality control is used. The basis of the method is the dependence of the parameters of ultrasonic oscillations, on these characteristics when they pass through the material. As the main parameter of the information ultrasonic signal, the time of its passage from the radiating to the receiving ultrasonic transducers is used. The amplitude of the information ultrasonic signal to a large extent depends on the structure of the investigated material, its acoustic resistance. At significant violations of the structure of the material there is a significant decrease in the amplitude of the information signal, which causes an increase in the error of measuring the time of its passage, and hence the definition of characteristics, quality of the investigated material. The article describes the developed method of increasing the accuracy of measuring the time of passage of the ultrasonic signal from the radiating to the receiving ultrasonic transducers. The essence of the technique is to use the mathematical modeling of the shape of the ultrasound signal, in particular the form of its so-called «first introduction».

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