Aging of high speed train wheelsets and its quantitative characteristics based on fracture mechanics for optimization of in-service inspection

S. J. Kwon, K. Ogawa, T. Shoji

Research output: Contribution to journalConference articlepeer-review

5 Citations (Scopus)

Abstract

The fracture mechanics characteristics in the critical locations of the wheelset for high-speed train have not been studied enough yet despite of severe conditions due to increase in operating speeds. Moreover, the fracture mechanics characteristics with respect to the aging effects of wheelset materials have not been clearly studied. In the present study, the following fracture mechanics characterization tests were carried out in accordance with various locations on the wheelset for high-speed train: fracture toughness depending on load rate, fatigue crack growth rate and fatigue thresholds. The results show that the fatigue crack growth rates in accordance to the locations on wheelset were not remarkably different, and the fatigue threshold in the region of the bolt-hole is lower than that in other regions. The fracture toughness depending on load rate data shows that once the downward curve from quasi-static values was reached, subsequent values showed a slow increase with respect to the impact velocity. This means that dynamic fracture toughness should be considered in the design code of the wheelset material.

Keywords

  • Dynamic fracture toughness
  • Fracture mechanics
  • High-speed train

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Aging of high speed train wheelsets and its quantitative characteristics based on fracture mechanics for optimization of in-service inspection'. Together they form a unique fingerprint.

Cite this