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研究结果表明，前叉立管在周期应力作用的环境中使用，非常容易形成疲劳裂纹，由此导致了摩托车前叉立管的断裂现象。
The investigation shows that the vertical shaft of the front fork is subject to fatigue flaw due to the cyclic stress, which leads to the fracture of the vertical shaft.
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