On the Use of Structural Noise Parameters in Testing 20GL Steel with Rayleigh Surface Waves under Elastoplastic Deformation

Khlybov, A. A.; Uglov, A. L.

doi:10.1134/s1061830921070081

Cited by 4 publications

(1 citation statement)

References 18 publications

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“…Ведутся работы по повышению точности и упрощению процедуры определения скорости рэлеевских волн [14]. В работе [15] рэлеевские волны исследуют на предмет структурных шумов стали 20ГЛ, которая широко используется при изготовлении деталей подвижного состава, и их связи с НДС и пластической деформацией металла. Проводятся исследования чувствительности ЭМА-преобразователей для возбуждения рэлеевских волн к эксплуатационным дефектам различного размера и наклона [16].…”

Section: Introductionunclassified

Ultrasonic Thread Surface Inspection of Railroad Car Wheels and Locomotive Tires Using Rayleigh Waves

Platunov,

Muravev,

Muraveva

2023

Intellekt. Sist. Proizv.

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Ultrasonic surface inspection of cylindrical objects using the Rayleigh wave echo method has many advantages. Despite strict requirements for surface cleaning, the method is widely implemented in industries and transport, for example on the all-rolled wheel thread or tires of railroad rolling stock. Taking into account the ability of the Rayleigh wave transducer to receive waves with a side ('back') lobe of the ray diagram, the influence of possible contamination or excess of contact fluid on the input surface on the control results, it becomes particularly difficult to explain the position and amplitude of the signal. Using mathematical modeling and experimental studies, the ray diagrams of Rayleigh wave piezoelectric transducers with the 'back lobe' characteristic of piezoelectric transducers of this type were obtained. The efficiency of emission and (or) receiving depends on the parameters of control and apparatus; this effect is more evident if the width of the transducer piezoelement deviates (e.g., during fabrication) and the frequency varies within 20 %, allowed by GOST R 55724-2013. The acoustic path of the Rayleigh wave reflected from the flaw with a diameter of 7 mm on the wheel thread is experimentally constructed and tested on the model. It is shown that the amplitude of the echo-signal changes nonuniformly, the local maxima obtained experimentally reach 9 dB relative to the exponential relation characteristic of propagation over a boundless surface. The reason for such phenomena lies in multiple re-reflections of waves from the boundaries on the tread surface of railway wagon wheels and locomotive tires (rim chamfer, ridge to ridge transition) and their further interference.

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Section: Introductionunclassified