Student | Hang Su | Materials and Manufacturing - RMCRC
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16 Jun Student | Hang Su | Materials and Manufacturing

Posted at 04:09h in Durability, Modelling and Algorithms, Students by
PhD students

Hang Su

Monash University (Supervisor: Wenyi Yan)

PhD topic – Plastic deformation of flash butt welds in high strength steel rails

Hang Su

Research summary

Due to the variation in material characteristics that are inherent with a welding process, rail welds have higher rates of rolling contact damage than the adjacent parent rails. This study will investigate the plastic deformation (ratcheting behaviour) of flash butt welds in high strength steel rails which are currently used in Australian heavy haul operations. The outcomes will provide valuable information about understanding the initiation of rolling contact fatigue in rail welds and further developing cost-effective rail maintenance strategies for the purposes of fulfilling the demanding conditions and maintaining a safe heavy haul environment.

Expected completion date

October 2020

Key achievements

  • The ratcheting behaviour of flash butt welds in high strength steel rails was investigated by experiments.
  • The cyclic plasticity constitutive model for flash butt welds in high strength steel rails was established.
  • The ratcheting performance of flash butt welds in high strength steel rails under in-service loading conditions was evaluated by numerical simulations.

Publications

Mojumder, S., Su, H., Qiu, C., Mutton, P., Singh, A. & Yan, W. (2020). The role of bending stress on the initiation of reverse transverse defects. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 0954409720904329.

Su, H., Li, J., Lai, Q., Pun, C. L., Mutton, P., Kan, Q., Kang, G. & Yan, W. (2020). Ratcheting behaviour of flash butt welds in heat-treated hypereutectoid steel rails under uniaxial and biaxial cyclic loadings. International Journal of Mechanical Sciences 176, 105539.

Su, H., Pun, C. L., Mutton, P., Kan, Q. & Yan, W. (2019). Numerical study on the ratcheting performance of heavy haul rails in curved tracks. Wear 436, 203026.

Su, H., Pun, CL., Mutton, P., Kan, Q. and Yan, W. (2018). Numerical study on the ratcheting performance of heavy haul rails in curved tracks. In 11th International Conference on Contact Mechanics and Wear of Rail/wheel Systems, CM 2018 (pp. 938-947). Delft, The Netherlands.

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