Контроль натяга колец подшипников поверхностными волнами с использованием эффекта акустоупругости

2021 ◽  
pp. 13-21
Author(s):  
С.А. Бехер ◽  
Л.Н. Степанова ◽  
А.О. Рыжова ◽  
А.Л. Бобров
Keyword(s):  
Elastic Waves ◽  
Stress Measurement ◽  
Correlation Method ◽  
Computational Studies ◽  
Error Minimization ◽  
Wave Pulse ◽  
Bearing Ring ◽  
Press Fit ◽  
Freight Car ◽  
Bearing Rings

In this paper, experimental and computational studies of the method of controlling the tension of bearing rings using the acoustoelasticity effect, based on measuring the characteristics of surface elastic waves propagating in a stressed medium, are carried out. Tuning samples of bearing rings tension on the axle neck of a freight car wheelset with an error of no more than 7 microns were developed and manufactured. Certification of a hydraulic stand for loading bearing rings, simulating their press fit on the axle, was performed. For surface waves, the acoustoelastic coefficient was measured by a Rayleigh wave pulse that repeatedly circled the ring. The correlation method for determining the delay time of a wave in a loaded ring relative to the unloaded one is optimized according to the condition of error minimization. The main reasons for the appearance of errors and uncertainties in the absolute time of propagation of a surface wave through the ring are considered: the influence of waves reflected from the boundaries, the curvature of the surface, and attenuation. The bearing ring tension was measured using the acoustoelasticity effect and the uncertainty of the stress measurement was estimated.

scholarly journals Absolute stress measurement of structural steel members with ultrasonic shear-wave spectral analysis method

2017 ◽  
Vol 18 (1) ◽  
pp. 216-231 ◽  
Author(s):  
Zuohua Li ◽  
Jingbo He ◽  
Jun Teng ◽  
Qin Huang ◽  
Ying Wang
Keyword(s):  
Spectral Analysis ◽  
Structural Steel ◽  
Shear Wave ◽  
Wave Amplitude ◽  
Stress Measurement ◽  
Amplitude Spectrum ◽  
Uniaxial Stress ◽  
Wave Pulse ◽  
Steel Members ◽  
Pulse Echo

Absolute stress in structural steel members is an important parameter for the design, construction, and servicing of steel structures. However, it is difficult to measure via traditional approaches to structural health monitoring. The ultrasonic time-of-flight method has been widely studied for monitoring absolute stress by measuring the change in ultrasonic propagation time induced by stress. The time-of-flight of the two separated shear-wave modes induced by birefringence, which is particular to shear waves, is also affected by stress to different degrees. Their synthesis signal amplitude spectrum exhibits a minimum that varies with stress, which makes it a potential approach to evaluating uniaxial stress using the shear-wave amplitude spectrum. In this study, the effect of steel-member stress on the shear-wave amplitude spectrum from the interference of two shear waves produced by birefringence is investigated, and a method of uniaxial absolute stress measurement using shear-wave spectral analysis is proposed. Specifically, a theoretical expression is derived for the shear-wave pulse-echo amplitude spectrum, leading to a formula for evaluating uniaxial absolute stress. Three steel-member specimens are employed to investigate the influence of uniaxial stress on the shear-wave pulse-echo amplitude spectrum. The testing results indicate that the amplitude spectrum changes with stress and that the inverse of the first characteristic frequency in the amplitude spectrum and its corresponding stress exhibit a near-perfect linear relationship. On this basis, the uniaxial absolute stress of steel members loaded by a test machine is measured by the proposed method. Parametric studies are further performed on three groups of steel members made of 65# steel and Q235 steel to investigate the factors that influence the testing results. The results show that the proposed method can measure and monitor steel-members uniaxial absolute stress on the laboratory scale and has potential to be used in practical engineering with specific calibration.

Detection of the Corrosion of Axisymmetric Elements by Means of the Eddy Current Testing Method

2015 ◽  
Vol 227 ◽  
pp. 545-548 ◽  
Author(s):  
Andrzej Zbrowski ◽  
Wojciech Jóźwik
Keyword(s):  
Eddy Current ◽  
Current Method ◽  
Eddy Current Method ◽  
Current Testing ◽  
Bearing Ring ◽  
Testing Method ◽  
Signal Value ◽  
Corrosion Defects ◽  
Bearing Rings ◽  
Peak Value

The article describes the influence the operating frequency of the transducer on the possibility to detect corrosion using the eddy current method. A bearing ring with two artificially made corrosion defects was used as a test object. The authors determined the characteristics of the defect’s signal value in the function of frequency. The results obtained were then compared to the peak-to-peak value of the signal for a model ring. The tests confirmed the possibility of automatic detection of corrosion on the surface of bearing rings using the eddy current method.

Использование метода акустоупругости для контроля упругих механических напряжений в материале колец подшипников

2020 ◽  
pp. 28-37
Author(s):  
А.О. Рыжова ◽  
С.А. Бехер ◽  
А.А. Попков
Keyword(s):  
Mathematical Model ◽  
Wave Propagation ◽  
Mechanical Stresses ◽  
Steel Shkh15 ◽  
Interference Fit ◽  
Longitudinal Waves ◽  
Bearing Ring ◽  
Bearing Rings ◽  
Acoustoelasticity Method

Designed and manufactured samples of the interference fit of the bearing rings on the neck of wheelset axle. The hydraulic stand for loading bearing rings has been certified. The stand simulates the pressing fit of rings on the axis. A mathematical model of the method for monitoring mechanical stresses of the bearing ring by the acoustoelastic method for chordal sounding has been created and solved. The model takes into account the change in the angle between the direction of wave propagation and the axis of the main mechanical stresses. Experimentally by loading the bearing rings are determined by the coefficient of customproperty longitudinal waves in steel SHKH15. The bearing ring tension was measured using the acoustoelasticity method on the bearing tension samples.

scholarly journals Influence of Residual Stress on Fatigue Weak Areas and Simulation Analysis on Fatigue Properties Based on Continuous Performance of FSW Joints

Metals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 284 ◽  
Author(s):  
Guoqin Sun ◽  
Xinhai Wei ◽  
Jiangpei Niu ◽  
Deguang Shang ◽  
Shujun Chen
Keyword(s):  
Residual Stress ◽  
Simulation Analysis ◽  
Stress Measurement ◽  
Correlation Method ◽  
Fatigue Property ◽  
Joint Model ◽  
Fatigue Properties ◽  
Hardness Profile ◽  
Continuous Performance ◽  
Friction Stir

The fatigue weak area of aluminum alloy for a friction stir-welded joint is investigated based on the hardness profile, the residual stress measurement and the simulation analysis of fatigue property. The maximum residual stresses appeared at the heat-affected zone of the joint in the fatigue damage process, which was consistent with the fracture location of the fatigue specimen. The fatigue joint model of continuous performance is established ignoring the original negative residual stress; considering that it will be relaxed soon when the joint is under tension-tension cyclic loading. The fatigue parameters of joint model is based on the static mechanical properties of the joint that obtained from the micro-tensile tests and four-point correlation method. The predicted results for the fatigue weak locations and fatigue lives based on the continuous performance joint model are closer to the fatigue experimental results by comparison with the simulation results of the partitioned performance joint model.

scholarly journals DEVELOPMENT OF METHODS OF RELIABILITY ASSESSMENT FOR TURRET BALL BEARING RING OF A BMP-2 INFANTRY FIGHTING VEHICLE

2021 ◽  
pp. 4-9
Author(s):  
O Akimov ◽  
V. Boiarov ◽  
M. Zhdaniuk ◽  
R. Kholodnyi ◽  
S. Pankov
Keyword(s):  
Ball Bearing ◽  
Spherical Shape ◽  
Average Diameter ◽  
Spare Parts ◽  
Test Time ◽  
Bearing Ring ◽  
Armored Vehicles ◽  
Steel Balls ◽  
Bearing Rings ◽  
The Impact

A large part of BMP-2 Infantry Fighting Vehicles needs to replace turret ball bearing rings. Under realization of replacement of spare parts and components made in Russia with domestic ones, KNVO "Fort" MVO Ministry of Internal Affairs of Ukraine made an experimental batch of balls for turret ball bearing rings of infantry fighting vehicles BMP type. As a result of modernization of a turret ball bearing ring, steel balls were replaced with balls made of composite material. A turret ball bearing is a large radial thrust bearing, cages of which are turret races. A stabile lower race is fixed by means of screws to a top of the vehicle‟s hull. Above the fixed race there is a movable upper race to which the turret is bolted. A method for assessing the reliability of turret ball bearing rings of military armored vehicles was developed. The results of tests of turret ball bearing rings of BMP-2 infantry fighting vehicle tower are given. The reliability of turret ball bearing rings of armored vehicles was assessed taking into account the damage to the balls. The main types of damage to the balls: non-compliance of balls average diameter and non-compliance of the spherical shape of the ball to the requirements of operating documentation. The impact of the probability of no-failure operation of the balls on the durability of the ball bearing is determined. It is necessary to take into account the presence of damage to the balls when determining the durability of the ball bearing. To validate the adequacy of the method, it is necessary to increase the test time of the ball bearing by conducting tests during its operation.

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