期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2015
期号：MULTICON
页码：1777
出版社：S&S Publications
摘要：Long welded rails are being introduced for railway tracks extensively in India for increasing the speed ofthe rolling stock and for better travel comfort. Thermit welding and flash butt welding are being used for welding ofrails in many countries. A number of firms are using these two techniques for welding of rails in India. Fatiguefracture of rails is a possible occurrence in railway tracks due to the fluctuating stresses caused by the varying trafficconditions including impact forces and also due to the low fracture toughness of the rail steels. Hence, a fatigue crackgrowth study of rail steel is paramount importance for ensuring the safe usage of the same in the railway tracks. In thisbackground, experimental investigations have been carried out on rail steel to study the fatigue crack initiation andcrack growth behaviour of base and weld metals. The fatigue crack growth studies were carried out on compacttension, C(T), specimens. The test specimens were fabricated from the base and weld metals of a typical rail sectionused in Indian Railways following ASTM E647 standard. The experiments were carried out as per the ASTM E1820standard. The fatigue crack growth studies were carried out under constant amplitude sinusoidal loading usingcomputer controlled servo - hydraulic fatigue rated universal testing machine. The test frequency was 5 Hz and theload ratio was 0.1. During the experimental studies, crack growth was monitored at regular intervals of fatigue loadingcycles using Image ProcessingTechnique. This paper discusses the experimental investigations carried out on rail steeland the results.
关键词：Long welded rails; Thermit welding; Flash butt welding; Base metal; Weld metal; Fatigue; Crack;initiation; Crack growth; Fracture toughness; Paris constants
