The acoustic waves propagation laws in the force-fit connections for test of the interference fit

Ryzhova, A. O.; Bekher, S. A.; Bobrov, A. L.

doi:10.1088/1742-6596/1050/1/012073

Cited by 4 publications

(2 citation statements)

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“…1a) and the method of free oscillations (Fig. 1b) for testing interference-fit joints were experimentally studied on samples with a known interference fit [9] and on real parts. In case of the ultrasonic testing method, the thickness of a clearance between the ring and the shaft is used as an informative parameter.…”

Section: Methodsmentioning

confidence: 99%

Capabilities of acoustic methods in testing of interference-fit joints

2018

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Tightness of joints on railway wheelsets is controlled by instruments based on a shrink fit method. To date, the shrink fit method has been replaced by an interference fit method. As a result, standard values of tightness have doubled. Therefore, there is an urgent need to upgrade and develop new methods for testing interference-fit joints. A promising solution is to use acoustic methods based on influence of material properties on propagation patterns of elastic waves. The purpose of this study is to evaluate the possibility to test fixed detachable joints by acoustic methods. Reference samples of interference-fit joints with known interference fits (29, 72 and 126 μm) were designed and produced. Experimental tests of samples and wheelset axles with inner bearing rings were conducted by a pulse-echo method and a method of free oscillations. The authors developed a procedure for determining the equivalent thickness of oil clearance using the proportionality factor of echo amplitude and sequence number of echo signals. When testing reference samples and loose bearing rings, frequency responses of the signals were obtained.

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Section: Methodsmentioning

confidence: 99%

Capabilities of acoustic methods in testing of interference-fit joints

2018

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“…The bearing rings of the axle box unit of a freight car are pressed onto the axle with an interference fit, that is, the diameter of the axle is larger than the inner diameter of the ring. However, over time, the friction force in the press connection weakens due to wear, and the ring begins to rotate on the axle, which can lead, at best, to overheating and failure of the axle box unit, and at worst, derailment of the rolling stock [1,2].…”

Section: Introductionmentioning

confidence: 99%

Study of press joints using strain gauges at low loads

Popkov,

Shlyakhtenkov,

Vyplaven

2024

E3S Web Conf.

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The destruction of the bearing ring of the axle box unit inevitably leads to the uncoupling of the car, which causes temporary and material losses. The problem of determining the bearing ring tension without removal is relevant; its solution will improve efficiency and reduce the inspection time. Experimental studies were carried out to determine the forces inside the contact pair, as well as their relationship with the amount of interference. It has been established that with small impacts on the ring, surface deformations in the area of impact are uneven and form a gradient in which large deformations are observed at the edge of the ring, smaller ones in the middle. It has been proven that the transition boundary of the magnitude of deformations depends on the magnitude of the interference in the contact pair. A method for determining the tension by strain gauging is proposed.

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