The impact of deformation in the zone of welded joints on the force action of the rolling stock on the track
https://doi.org/10.21780/2223-9731-2020-79-1-9-16
Abstract
The causes of deformation in the zone of welded joints are considered. Authors experimentally studied changes in hardness on the rolling surface of the rail in the longitudinal and transverse profiles within the thermally affected zone of the welded joint. It is established that the hardness of the rolling surface of the rail in the longitudinal direction in the thermally affected zone of the joint is uneven and is determined by the structures arising from the effects of the thermal cycles of welding and the quality of the local heat treatment. In this case, two "low spots" are clearly traced with a decrease in hardness to 290...300 HB and with a higher hardness up to 350 HB right in the welded joint. Experimentally investigated the change in the depth of the welded joint from the implemented tonnage. At the same time with strain gauge method, using the force method developed by N. N. Kudryavtsev, continuous changes in vertical forces when the wheels move along the welded joint zone were recorded. Average values of vertical forces from loaded cars were established. Experimental distributions of vertical forces were approximated by theoretical laws according to the Kolmogorov — Smirnov matching criterion. Recommendations are given on minimizing the harmful impact of rolling stock on the track in areas of lowering welded joints.
The following conclusions were made.
1. Geometry of the joint irregularity is in the form of a W-shaped deformation with an influx of metal on the receiving rail and lowering on the directing rail. The width of the upper part of the deformation varies between 160...200 mm along the axis of the rail.
2. Deformation zone of the welded joint is a source of increased dynamic impact from the wheels of the rolling stock on the elements of the upper track structure. According to the results of experimental studies it was found that the greatest increase in dynamic effects was observed from locomotive wheels up to 45.. . 70 kN, maximum values reached 180...210 kN, from the wheels of loaded freight cars the values of vertical forces increased by 35.. .45 kN, maximum values reached 145...170 kN, from the wheels of empty cars increase dynamic impacts amounted to 14...16 kN, maximum values reached 32...36 kN.
About the Authors
V. S. Kossov
Joint Stock Company "Research and Design Institute of Rolling Stock" (JSC "VNIKTI")
Russian Federation
Russian Federation
Valeriy S. Kossov - Dr. Sci. (Eng.), Professor, General Director of the JSC “VNIKTI”.
Kolomna, 140402
O. G. Krasnov
Joint Stock Company "Research and Design Institute of Rolling Stock" (JSC "VNIKTI")
Russian Federation
Russian Federation
Oleg G. Krasnov - Cand. Sci. (Eng.), Head of the Department of track and special rolling stock, JSC “VNIKTI”.
Kolomna, 140402
M. G. Akashev
Joint Stock Company "Research and Design Institute of Rolling Stock" (JSC "VNIKTI")
Russian Federation
Russian Federation
Mikhail G. Akashev - Leading Engineer, JSC “VNIKTI”.
Kolomna, 140402
References
1. Verigo M. F., Kogan A. Ya. Vzaimodeystvie puti i podvizh-nogo sostava [Interaction of the track and rolling stock]. Moscow, Transport Publ., 1986, 560 p.
2. Kogan A. Ya. Dinamika puti i ego vzaimodeystvie s podvizh-nym sostavom [Dynamics of the track and its interaction with rolling stock]. Moscow, Transport Publ., 1997, 326 p.
3. Kudryavtsev N. N. Issledovanie dinamiki neobressorennykh mass vagonov[The study of the dynamics of unpressured masses of cars]. Tr. Vsesoyuzn. nauch.-issled. in-ta zh.-d. transporta [Proc. of the All-Union Railway Research Institute]. Moscow, Transport Publ., 1965, no. 97, 168 p.
4. Kudryavtsev N. N., Melent'ev L. P, Granovskiy A. N. Izmerenie vertikal'nykh sil, deystvuyushchikh ot koles podvizhnogo sostava na rel'sy [Measurement of vertical forces acting on the rails of rolling stock wheels]. Vestnik VNIIZhT [Vestnik of the Railway Research Institute], 1973, no. 6, pp. 31 -33.
5. Yakovlev V. F. Issledovanie dinamicheskikh kontaktnykh defor-matsiy vkolesakh i rel'sakh vekspluatatsionnykh usloviyakh [Investigation of dynamic contact deformations in the wheels and the rails in the operating conditions]. Nauch. tr. Leningr. in-ta inzhenerov zh.-d. transporta [Scientific proceedings of the Leningrad's Institute of the Railway Engineers]. Leningrad, 1964, no. 210, pp. 76-124.
6. Shur E. A., Fedin V. M., Borts A. I., Ronzhina Yu. V., Fimkin A. I. Puti ustraneniya povyshennoy povrezhdaemosti rel'sov v zone svarnykh stykov[Methods of elimination of rails increased damage in the area of weld joints]. Vestnik VNIIZhT [Vestnik of the Railway Research Institute], 2019, Vol. 78, no. 4, pp. 210-217. DOI: http://dx.doi.org/10.21780/2223-9731-2019-78-4-210-217.
7. Genkin I. Z. Razrabotka i vnedrenie tekhnologiisvarkirel'sov, podvergnutykh ob“emnoy i poverkhnostnoy zakalke [Development and implementation of technology of rails welding subjected to bulk and surface hardening]. Informatsiya po otdel'nym vopro-sam. Vyp. 2: Opyt raboty rel'sosvarochnykh poezdov [Information on specific issues. Issue 2: Experience in rail welding trains]. Moscow, TsNIITEI MPS Publ., 1971, pp. 26-38.
8. Rezanov V. A. Metodika issledovaniya izmeneniya tempera-tury na razlichnom rasstoyanii ot stykov pri svarke rel'sov [Methodology for studying temperature changes at different distances from the joints when welding the rails]. Vestnik VNIIZhT [Vestnik of the Railway Research Institute], 2011, no. 4, pp. 40-43.
9. Kompleks vysokochastotnyy induktsionnyy nagrevatel'nyy UIN 001-100/RT-S: pasport GBNK.682322.001. 2006 [High-frequency induction heating complex UIN 001-100/RT-S: passport GBNK.682322.001.2006].
10. Used rails. Technical conditions for repair, welding and use of rails. Approved by Ministry of Railways of the Russian Federation No. TsPT-80/350 dated October 10, 2003. Moscow, 2003,43 p. (in Russ
11. Nikolin A. I., Borts A. I. Metody povysheniya tsiklicheskoy prochnosti i iznosostoykosti svarnykh rel'sov i snizheniya energozatrat na ikh termicheskuyu obrabotku [Methods to increase the cyclic strength and wear resistance of welded rails and reduce energy costs for its heat treatment]. Razvitie zheleznodorozhnogo transporta v usloviyakh reform. Sb. nauch. tr. [Development of railway transport in the conditions of reforms. Proc. of scientific works]. Moscow, Intext Publ., 2003. pp. 225 – 231.
12. Nikolin A. I. Sovershenstvovanie protsessov svarki i termicheskoy obrabotki rel'sov magistral'nykh zheleznykh dorog. Kand. tekhn. nauk diss. [Improving the processes of welding and heat treatment of rails of main railways. Cand. tech. sci. diss.]. Moscow, 2004, 200 p.
Review
For citations:
Kossov V.S., Krasnov O.G., Akashev M.G. The impact of deformation in the zone of welded joints on the force action of the rolling stock on the track. RUSSIAN RAILWAY SCIENCE JOURNAL. 2020;79(1):9-16. (In Russ.) https://doi.org/10.21780/2223-9731-2020-79-1-9-16
Views:
722
.jpg)
Email this article 