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首页> 外文会议>ASME(American Society of Mechanical Engineers)//IEEE（Institute of Electrical and Electronics Engineers）Joint Rail Conference; ASME(American Society of Mechanical Engineers) Internal Combustion Engine Division Spring Technical Conference; 20070313-16; 2 >ESTIMATION OF THE FATIGUE LIFE OF RAILROAD JOINT BARS
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ESTIMATION OF THE FATIGUE LIFE OF RAILROAD JOINT BARS

机译：铁路连接杆的疲劳寿命估算

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摘要

This paper investigates the influence of physical track conditions in the vicinity of a rail joint on the fatigue life of the joint bars. Recent derailments due to broken joint bars, such as the Minot, ND accident in January 2002, have highlighted the need for better understanding of the effects of joint conditions on premature joint bar failure. Fatigue life estimates can be used to guide the selection of inspection intervals for joint bars in service. Engineering approximations are used to infer the dynamic load factor at a rail joint due to joint characteristics including: 1. Rail end gap. 2. Joint efficiency (looseness). 3. Track stiffness (vertical foundation modulus). A three-dimensional finite element analysis of a rail joint is conducted and the dynamic load is applied to develop an estimate of the live (bending) stresses at the joint due to passing wheels. These stresses are then used to estimate the fatigue life of the joint bars. The methodology is demonstrated for 132RE rail with companion joint bars. The effect of thermal expansion (or the temperature difference below the rail neutral temperature) is investigated. Typical wheel loads and railcar speeds are considered and results are presented for a baseline a joint condition.
机译：本文研究了轨道接头附近的物理轨道状况对接头杆疲劳寿命的影响。最近由于连接杆断裂而导致的脱轨，例如2002年1月在北卡罗来纳州的Minot发生的事故，突显了需要更好地了解关节状况对过早的连接杆失效的影响。疲劳寿命估计值可用于指导选择使用中的连接筋的检查间隔。由于接头的特性，工程近似值可用于推导铁路接头处的动态载荷因数，其中包括：1.铁路端部间隙。 2.联合效率（宽松）。 3.轨道刚度（垂直基础模量）。进行了铁路接头的三维有限元分析，并施加了动态载荷，以估算由于车轮通过而在接头处产生的活动（弯曲）应力。然后将这些应力用于估算连接杆的疲劳寿命。该方法已针对带有配对接头的132RE导轨进行了演示。研究了热膨胀（或低于轨中性温度的温度差）的影响。考虑了典型的车轮载荷和轨道车速度，并给出了基线和关节状况的结果。

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