Based on real wheel–rail system, a full-scale wheel–rail test rig was designed and manufactured to simulate the working conditions of heavy haul railway, taking into account the mechanical and dynamic systems. The test rig was utilized for graded loading in order to investigate the evolution law of surface wear of U75V rail under different load levels. These tests covered axle load levels from 14 to 30 t and were divided into nine groups, with each group undergoing 200,000 rolling contact wear cycles. Each 20,000 rolling cycles were considered as an observation phase, and at the end of each phase, changes in rail surface morphology and wear volume were observed and quantitatively analyzed using an optical microscope and a 3D profilometer. The study revealed that, after controlling for environmental variables, the primary wear mechanisms on the rail surface were adhesive wear and fatigue wear. As the number of wheel cycles increased, there was an alternating dominance between adhesive wear and fatigue wear. With increasing axle load levels, the wear volume under the same number of rolling cycles showed a three-tiered nonlinear increase, with boundaries at 20 and 28 t.
U75V Rail Wear Research Using a Full-Scale Wheel–Rail Test Rig and 3D Scanning Technology
Third International Conference on Rail Transportation ; 2024 ; Shanghai, China
ICRT 2024 ; 218-228
2025-03-18
Conference paper
Electronic Resource
English
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