本文基於國立成功大學機械工程學系破壞力學實驗室過去的研究，回顧軌道力學的破壞分析論文。所有因素都影響軌道的安全，包括裂縫幾何形狀種類、金屬成形和輪/軌接觸表面所產生的塑性變形，磨擦力作用在軌道表面、裂縫表面及滾動方向都將在本文內討論。因此包括了混合模式破壞問題，應變能密度定理來評估三種不同種類(枝節裂縫、表面裂縫及殼狀裂縫)的破壞行為，本文討論強調，在裂縫成長的方向和裂縫裂縫驅動作用力Smin 稱做應變能密度因子。除此之外，軌道疲勞壽命是可以預測的。

Based on the previous researches of NCKU ME Fracture Mechanics Laboratory, this paper reviews the fracture analysis of rail mechanics. All factors that will affect the safety of rails and will be discussed here include the geometries of the cracks, the residual stresses due to metal forming and plastic deformation at wheel/rail contact surface, friction forces acting on the rail surface and the crack surfaces, and the rolling direction. Since it involves mixed mode fracture problems, the strain energy density theory is used to evaluate the fracture behavior of three different crack types: detail crack, surface crack and shell crack. The discussions are emphasizes on the direction of the crack propagation and the crack driving force Smin, called the strain energy density factor. In addition, the fatigue life of rail can also be predicted.

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