Uniaxial and biaxial torsional fatigue tests were conducted on the samples extracted from urban railway wheel steel. Ultimate and yield strengths of the steel were 1027.7MPa and 626MPa, respectively. The uniaxial fatigue limit was 422.5MPa, correspond...
Uniaxial and biaxial torsional fatigue tests were conducted on the samples extracted from urban railway wheel steel. Ultimate and yield strengths of the steel were 1027.7MPa and 626MPa, respectively. The uniaxial fatigue limit was 422.5MPa, corresponding 67% of the ultimate tensile strength. The ratio of Te/Oe was 0.63. Fatigue strength coefficient and exponent were 1319.5MPa and 0.339, respectively. Maximum principal and equivalent strain were found to be adequate parameter to predict fatigue lifetime of the steel under multiaixal fatigue condition.