某大桥钢轨发生横向断裂。

A transverse fracture occurred in a rail of a bridge.

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因此，必须及时检测并发现钢轨中存在的裂纹或断裂，确保铁路运输的安全和畅通。

Therefore, rail fractures must be detected in time in order to ensure the safety of rail transportation.

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通过断裂力学分析，估算出u 74重轨的正常使用寿命及伤轨残余使用寿命；探讨了钢轨纵裂的可能机制。

Normal service life of U74 heavy rail and service life of the damaged rail are estimated by fracture dynamical analysis and possible mechanism on the longitudinal crack on the rail discussed.

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