THREE-DIMENSIONAL SQUAT-TYPE CRACK GROWTH UNDER ROLLING CONTACT FATIGUE IN RAILS
CM 2022 - 12th International Conference on Contact Mechanics and Wear of Rail/Wheel Systems, Conference Proceedings
Squats cause wide concern for railway safety management due to their popularity and the significant increase. The current work introduced a symmetrical modeling strategy to investigate three-dimensional squat crack growth from an early stage tiny squat with a leading branch to the mature squat with both leading and trailing branches. The numerical strategy coupled the finite element method for stress status at the crack front in rail and the boundary element method for subsequent crack growth. The results show the formation of trail crack is due to the combined cracking modes of shearing and tearing and large opposite mode II shearing at the field corner of the crack. Maximum shear stress criteria are valid before the squat crack grows to certain deep. Mode I could assist in crack turning down at the mature growth stage.
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