Strain-controlled low cycle fatigue tests were performed on 60 kg/m 90-UTS plain C-Mn rail steel with fully pearlitic microstructure. Analysis of hysteresis loop shape and properties revealed that the steel deviated from the ideal Masing type material behaviour to a little extent. To evaluate the fatigue damage in rail steel, energy-based analytical approach proposed by Morrow based on Masing hypothesis was employed. The Morrow energy model resulted in reasonably good approximation of both average plastic strain energy and fatigue life in comparison to experimentally observed values. In addition to that the plastic strain energy density (ΔW_p) was correlated to fatigue life (2N_f) through a simple power law and very well represented by Coffin-Mansion type relationship similar to conventional strain-life (Δε_p – 2N_f) relationship. Finally, the concept of fatigue toughness, an energy parameter, was introduced to life prediction in rail steel which was proved to be a suitable and reliable alternative to strain-life approach in fatigue damage evaluation with high degree of accuracy.

对具有完全珠光体组织的60 kg / m 90-UTS普通C-Mn钢进行了应变控制的低周疲劳测试。对磁滞回线形状和性能的分析表明，钢在某种程度上偏离了理想的Masing型材料性能。为了评估铁路钢的疲劳损伤，采用了Morrow基于Masing假设提出的基于能量的分析方法。与实验观察到的值相比，Morrow能量模型得出的平均塑性应变能和疲劳寿命都相当合理。此外，塑性应变能密度（ΔW _p）与疲劳寿命（2 N _f）通过简单的幂律和很好的通过类似于常规应变寿命（Δε棺材-大厦类型的关系表示_p - 2 Ñ _˚F）的关系。最后，将疲劳韧性的概念（一种能量参数）引入了轨道钢的寿命预测中，事实证明，该方法是疲劳寿命评估中应变寿命方法的合适且可靠的替代方法，具有较高的准确度。