1、
Basal crack in steel rail is a larger breakage occurred in the center of steel rail bottom.
钢轨底裂是出现于轨底中央部分较大的破裂，严重时有底裂缺陷的钢轨达钢轨总产量的3.52%.本文探讨钢轨底裂的基本特征及其来源；
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2、
However, the higher CRSS of basal slip raised the crack propagation driving force.
但较高的临界分切应力使得基面滑移系实际开动困难，增加了裂纹扩展所需驱动力。
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