V. V. Murav’ev

Estimation of residual stresses in locomotive wheel treads using the acoustoelasticity method

An ultrasonic method for the estimation of residual stresses in locomotive wheel treads with the electromagnetic acoustic excitation and reception of elastic waves is described. The results that were obtained for the distribution of residual stresses along the thickness of treads by the calculation and experimental methods with consideration for textural and structural factors are reported.

An electromagnetic-acoustic method for studying stress-strain states of rails

Experimental results of measuring mechanical stresses in R65 rails with the use of the acoustic elasticity effect and an electromagnetic-acoustic method for the input-reception of shear waves are presented. Results of modeling compressive stresses in a rail segment are provided. The experimental results are compared with theoretical estimates for stresses that are induced in a restrained rail by the temperature action. The results of monitoring residual stresses in rails are described for a segment of continuous welded rails.

Analysis of reflected signals in testing cylindrical specimens by the multiple reflection echo-shadow method

In this paper, we present the results of correlation, spectral, and probabilistic-statistical analyses of signals in the flaw inspection of cylindrical specimens by the multiple reflection echo-shadow method, and establish new informative parameters for the purpose of their integrated use to improve the reliability of nondestructive testing results.

Evaluation of the interference value for the treads of locomotive wheels by the acoustic elasticity method

A method for monitoring the interference fit of the locomotive wheel treads on the wheel center by the values of the residual stresses measured by the acoustic-elasticity method using electromagnetic-acoustic generation-reception of elastic waves is proposed. The results of evaluation of the residual stresses in the treads before and after fitting them on the wheel centers are presented. The results of the acoustic control of the interference values of treads after the shrink fitting are reported.

Estimation of the residual stresses in rails using electromagnetic–acoustic introduction–reception of waves

An approach to estimating the residual stresses in rails using acoustoelasticity and electromagnetic–acoustic conversion is described. The results of ultrasonic control of the residual stresses in rail segments are presented.

Methodological peculiarities of using SH- and Lamb waves when assessing the anisotropy of properties of flats

The sensitivity of Lamb waves and SH-waves to changes in elastic properties has been studied in different parts of dispersion curves. We demonstrate methodological peculiarities of using these waves for assessing the anisotropy of sheet iron with regard to the selection of frequency range and wave mode and an allowance for the scale factor of anisotropy. Distinctive features of the suggested technique are presented.

Effect of traffic volume on acoustic structural noises in rails

Pre- and post-operation levels of acoustic structural noise has been studied in rail segments. The effect of the service life and let-through tonnage on the acoustic parameters of rails has been demonstrated as compared to idle rails.

Experimental study of residual stresses and interference of locomotive wheels by the acoustoelasticity method

Abstractltrasound method to evaluate residual stresses in locomotive wheels using the electromagnetic–acoustic excitation and reception of elastic waves is described. The results of residual stress distribution throughout the wheel thickness before and after fitting of wheel centers are presented. A method for controlling the interference of locomotive wheels by the measured values of residual stresses using the acoustoelasticity method is proposed.

An instrument for measuring acoustic wave velocities in metals and alloys

A circuit and principle of operation of the instrument for measuring ultrasonic-wave propagation times, which is based on the autocirculation method using up-to-date electronics, are described. The circuit solutions, allowing one to sufficiently decrease the measurement error, are presented. The methods that ensure a high determination accuracy of ultrasonic-wave velocities in steel samples are considered. Areas of instrument applications are shown.

Effect of the Rail-Carried Tonnage on the Ultrasonic Surface and Lateral Wave Velocities

The changes in the ultrasonic surface and lateral wave velocities near the head running surfaces of rails having carried various weights are studied. The surface and lateral wave velocities are found to correlate with the hardness and the structure of rail steel.