The paper presents a comparison of the results of the fatigue crack growth rate for raw rail steel, steel reinforced with composite material—CFRP—and also in the case of counteracting crack growth using the stop-hole technique, as well as with an application of an “anti-crack growth fluid”. All specimens were tested using constant load amplitude methods with a maximum loading of F_max = 8 kN and stress ratio R = s_min/s_max = 0.1 in order to analyze the efficiency of different strategies of fatigue crack growth rate deceleration. It has been shown that the fatigue crack grows fastest in the case of the raw material and slowest in the case of “anti-crack growth fluid” application. Additionally, the study on fatigue fracture surfaces using light and scanning electron (SEM) microscopy to analyze the crack growth mechanism was carried out. As a result of fluid activity, the fatigue crack closure occurred and significantly decreased crack driving force and finally resulted in fatigue crack growth decrease.

中文翻译：

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珠光体钢中I型加载方式下疲劳裂纹扩展速率的减缓方法分析

本文比较了使用复合材料CFRP增强的生轨钢，复合材料增强钢的疲劳裂纹扩展率的结果，以及使用止动孔技术抵消裂纹扩展的情况以及应用一种“抗裂增长液”。所有样品均使用恒定载荷振幅方法进行测试，最大载荷F _max = 8 kN，应力比R = s _min / s _max= 0.1以便分析疲劳裂纹扩展速率不同策略的效率。已经表明，在原材料情况下，疲劳裂纹增长最快，而在“抗裂增长液”应用中，疲劳裂纹增长最慢。另外，利用光学显微镜和扫描电子显微镜对疲劳断裂表面进行了研究，以分析裂纹的扩展机理。流体活动的结果是，发生疲劳裂纹闭合，裂纹驱动力显着降低，最终导致疲劳裂纹扩展减少。