Assessment of the tightening force of track screws in elastic rail fastenings by the strain gauge method
https://doi.org/10.46973/0201-727X_2025_3_8
Abstract
The article presents the results of a study on the tightening forces of screws in ZhBR-65Sh fastenings for three groups of screws with different conditions of the threaded surface, using a constant standard tightening torque of 250 N·m. Strain gauges installed on the clip were used for the experimental determination of the actual clamping force in the thread. The arrangement of the strain gauges was chosen based on a preliminary study of the stressstrain state of the ZhBR-65 fastening clip. The most characteristic deformation zones of the elastic clip are the technological bends in the end and side sections. The modeling also showed that the share of the elastic clip's clamping force acting on the rail base is 40.2% of the tightening force of the track screw.
The results of the study show that the tightening force of track screws is a random variable distributed according to a normal law. Screws with signs of corrosion and thread contamination, under increased rail clamping force requirements for regions with annual temperature fluctuations greater than 110°C, are unable to provide the necessary clamping in more than half of the cases. Cleaning the threads significantly increases the likelihood of achieving the required force; however, only the use of lubricated screws almost completely guarantees compliance with rail clamping standards. Such a wide range of tightening forces does not allow the anti-creep and elastic properties of modern intermediate rail fastenings to be effectively realized.
About the Authors
A. S. Ilinykh
Siberian Transport University (STU)
Russian Federation
Russian Federation
Ilinykh Andrey Stepanovich, Chair “Technology of Transport Engineering and Machine Operation”, Doctor of Engineering Sciences, Professor
A. A. Voychenko
Siberian Transport University (STU)
Russian Federation
Russian Federation
Voychenko Alexander Alexandrovich, Chair “Technology of Transport Engineering and Machine Operation”, Postgraduate Student
T. S. Abramova
Siberian Transport University (STU)
Russian Federation
Russian Federation
Abramova Tatyana Sergeevna, Chair “Physics, Electrical Engineering, Diagnostics and Control in Technical Systems”, Postgraduate Student
References
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Review
For citations:
Ilinykh A.S., Voychenko A.A., Abramova T.S. Assessment of the tightening force of track screws in elastic rail fastenings by the strain gauge method. Vestnik Rostovskogo Gosudarstvennogo Universiteta Putej Soobshcheniya. 2025;(3):8-17. (In Russ.) https://doi.org/10.46973/0201-727X_2025_3_8
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