基于主S-N曲线法的车体疲劳寿命评估
Fatigue Life Evaluation of Car Body Based on Master S-N Curve Method

为研究动车组车体疲劳强度是否符合设计要求，采用主S-N曲线法分别评估车体在EN12663标准中疲劳工况下的疲劳强度和在实测低频载荷谱下的疲劳强度，并将两种工况下的计算结果进行对比。结果表明：在两种工况下车体疲劳强度都符合设计要求；使用EN12663标准提供的工况计算出来的疲劳寿命值更小，按照标准进行设计是十分安全的。
In order to study whether the car body fatigue strength meets the design requirements, the master S-N curve method is used to evaluate the car body’s fatigue strength under fatigue conditions in the EN12663 standard and the fatigue strength under the measured low-frequency load spectrum，and compare the calculation results under two conditions. The results show that the fatigue strength of the car body meets the design requirements under both conditions; the fatigue life value calculated under the fatigue conditions of EN12663 standard is smaller, and it is safe to design according to the standards.