- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | LI Zhiqiang, ZHENG Yinan, ZHANG Xiaokang, LI Jie, YANG Zhiyong. Influence of Braking Conditions on Residual Stress and Warping Deformation of Brake Discs of High-Speed Trains[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230691
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The brake disc of electric multiple units (EMUs) will form complex residual stress during long-term service, which will lead to irreversible warping deformation after disassembly. In order to investigate the influence of residual stress and warping deformation on the feasibility of subsequent maintenance and reuse of brake discs, firstly, the Ramberg-Osgood constitutive model of corresponding materials was constructed by testing the tensile stress-strain data of cast steel for wheel-mounted brake discs of EMUs at different temperatures. A cyclically symmetric three-dimensional transient numerical simulation model of brake discs was established in finite element software. Secondly, the formation and balance process of residual stress in the surface and center of the brake disc were analyzed by indirect coupling method for different braking conditions considering different initial braking speeds and different average decelerations of the train. The change in warping deformation of the brake disc after structural constraint release was studied. The functional relationship between brake disc deformation and braking energy and heat input power was fitted by piecewise function and polynomial. Finally, by measuring the warping deformation and testing the X-ray residual stress of the brake disc after service, the residual stress distribution law on the friction surface of the brake disc under the corresponding simulation condition was compared. The simulation results had good data and trend consistency with the measured data. The study reveals that the warping deformation of the brake disc is positively correlated with braking energy and braking deceleration. More severe braking condition indicates greater warping deformation of the brake disc. The simulation and measurement show that the high residual tensile stress is located in the middle of the friction surface and close to the bolt holes. The high residual tensile stress value is higher when the braking condition becomes more severe.
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