CRITICAL STRESS DISTRIBUTION ASSOCIATED WITH NONMETALLIC INCLUSIONS IN HIGH-SPEED TRAIN WHEELS
CM 2022 - 12th International Conference on Contact Mechanics and Wear of Rail/Wheel Systems, Conference Proceedings
Nonmetallic inclusions or their chain-like distribution could cause shattered rims, a typical rolling contact fatigue failure of train wheels. The advanced experiment and FEM simulation strategy were developed to investigate the critical stress distribution associated with nonmetallic inclusions in high-speed train wheels. It has been found that most of the inclusions in the studied high-speed wheel have a length smaller than 9 μm. Hard inclusions (Al2O3) cause a significant stress concentration at the poles, while soft inclusions (MnS) and voids trigger stress concentration at the equator. The inclusion cluster plays an essential role in stress concentration and fatigue performance. If alumina inclusions are chain-likely distributed along the radial direction of the wheel, it presents the risk for crack initiation and fatigue life reduction. Void clusters also potentially cause deep-surface damage to the train wheels.
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