对钩舌产生的两种典型失效形式—磨损和裂纹进行了详细观察，并对其形成机理进行了探讨。
Two typical failures of abrasive wear and cracks for the hook head were studied, and its mechanisms were discussed.
对重载列车E级钢钩舌进行了应力分析，导出了钩腕面裂纹的应力强度因子表达式。
The stress of E-grade steel coupler knuckle was analyzed and the expression of stress intensity factor of the cracks on the coupler knuckle wrist area was given.
钩形、“人”字形、“之”字形、伞形等形状的微裂纹是由这三种基本形状的微裂纹构成的。
Other cracks with complicated shapes, such as the "hook" crack, the "zigzag" crack, the "chevron" crack and the "umbrella" crack, consist of the above mentioned three basic cracks.
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