It is concluded that, the residual stress induced by cold expansion can maintain enough strength to prevent and retard fatigue crack initiation and growth in rail bolt hole.
结果表明，冷扩张过程所引入的切向残余压应力能保持足够的强度，以对钢轨螺栓孔起到显著的防裂和止裂作用。
Therefore, it is an effectivemethod to improve corrosion fatigue property to use the hole cold-expansion technique in the aircraft and other structures.
因此，在飞机和其他结构的关键部位，采用冷胀孔技术是一种提高腐蚀环境下结构疲劳性能的行之有效的方法。
By comparing with the experimental results, a detailed discussion on the influence of cold expansion on the fatigue performance of rail bolt hole was presented.
结合实验探讨了冷扩张过程对钢轨螺栓孔疲劳寿命的影响方式和效果。
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