In this work, to reduce the fracture in butt-welded rail under service loads, a numerical study is carried out to estimate the crack initiation life. For this purpose, the J-S model in terms of the critical plane method is used. To increase the fatigue life of the welded joint, considering the amount of fractured butt welded joints in the railway of the Iranian network, the important variables of the flash-butt welding process are optimized. To this end, the welding process modeling in Abaqus is converted to Python code, and by using a coupled procedure utilizing Matlab, the optimization process is performed by the imperialist competitive algorithm (ICA). The capability of each governing variable on increasing crack initiation life is discussed.

在这项工作中，为了减少对焊钢轨在使用载荷下的断裂，进行了数值研究来估计裂纹萌生寿命。为此，使用了临界平面方法方面的 JS 模型。为提高焊接接头的疲劳寿命，考虑伊朗网铁路对焊接头断裂量，对闪光对焊工艺的重要变量进行优化。为此，Abaqus 中的焊接过程建模被转换为 Python 代码，并通过使用 Matlab 的耦合程序，通过帝国主义竞争算法 (ICA) 执行优化过程。讨论了每个控制变量增加裂纹萌生寿命的能力。