Variety of rail defects and long-term of external force will cause the phenomenon of rail fracture. There are two common reasons which will causes rail break.

在轨道交通中，钢轨由于自身材质的缺陷以及长期受到各种外力复合作用会使得钢轨发生折断现象。

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Based on a failure model of fracture mechanics pattern, this new method deals with the life estimation in the light of the standard promulgated by the Railway Ministry for rail replacement.

在运用断裂力学模式所建立的故障模型基础上，该法用铁道部部颁换轨标准处理寿命估算。

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The effect of specimen type, thickness, dimension ratio, and notch sharpness on fracture toughness of a carbon rail steel was examined.

研究了试样类型、试样厚度、比例试样尺寸及切口尖度等因素对普碳轨钢断裂韧性的影响。

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It's not clear if the accident caused the fracture or if the rail was broken before the crash, the NTSB's Earl Weener said.

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Two segments of rail in the area of the fracture also had been removed and are being sent to a laboratory for analysis, he said.

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