Moscow, Moscow, Russian Federation
employee
Moscow, Moscow, Russian Federation
employee
Moscow, Moscow, Russian Federation
The issues of the influence of stress concentrators in load-bearing structures of railway rolling stock on their fatigue life and survivability are considered. It is found out that not only welded joints act as stress concentrators, but also structural zones that have been damaged in operation, have internal defects or have been subjected to thermal or mechanical treatment with breakdowns in process. It is advisable to consider the limiting energy density of deformation as a rational criterion for material damage, taking into account elastic-plastic deformation of the material in the stress concentration zone. The analysis of the damage to load-bearing structures shows that the concentration of fatigue damage is fixed in the near-weld zones of joints. Based on the conducted analysis of the damage to the load-bearing structures of the rolling stock, there is a need found to exclude stress concentration zones and ensure continuous monitoring and timely troubleshooting.
stress-strain state (SSS), density, energy, deformation, joints, microcracks, damages
1. Vinokurov VA, Aladinsky VV, Dubrovsky VA. Stress concentration in joints with frontal seams and its accounting in endurance calculations. Automatic Welding. 1987;7:18-23.
2. Sih GC. Mechanics and physics of energy density theory. Theoretical and Applied Fracture Mechanics. 1985;4(3):157-173.
3. Tutyshkin ND, Travin VYu. Tensor theory of deformation damage. Chebyshevsky Collection. 2022; 23(5(86)):320-336.
4. Zhuravlev GM, Gvozdev AE. Plastic dilatancy and deformation damage of metals and alloys. Tula: Tula State University; 2014.
5. Voronin NN, Seydakhmetov NB, Rezanov VA. The influence of technological parameters on the thermal cycle at butt flash welding of rails. Welding International. 2019;33(7-9):327-333.
6. Voronin NN, Rezanov VA, Seydakhmetov NB. The influence of technological parameters on the thermal cycle during butt resistance welding of rails. Welding Production. 2019;11:21-28.
7. Voronin NN. Resource assessment of welded joints in critical structures. Metals. 2002;2:86-93.
8. Voronin NN, Voronin NN, Budarina ON. The main reasons for the fracture of the side frames of freight car bogies. Tekhnologiya Mashinostroeniya. 2018;4:34-37.
9. GOST 32.183-2013 Molded side frame and bolster beam of bogies for railway freight wagons. Specifications. Moscow: Standartinform; 2014.
