The fatigue failure around rail-end-bolt holes is particularly dangerous since it leads to derailment of trains and consequently to inevitable accidents. It is well-known that the fatigue life of structural holed components, subjected to cyclic load, can be increased by generating compressive hoop stresses around the holes. | Nội dung Text Enhancement of fatigue life of rail-end-bolt holes by slide diamond burnishing Engineering Solid Mechanics 2 2014 247-264 Contents lists available at GrowingScience Engineering Solid Mechanics homepage esm Enhancement of fatigue life of rail-end-bolt holes by slide diamond burnishing J. T. Maximov G. V. Duncheva A. P. Anchev I. M. Amudjev and V. T. Kuzmanov Department of Mechanical Engineering Technical University of Gabrovo 5300 Gabrovo Bulgaria ARTICLE INFO ABSTRACT Article history The fatigue failure around rail-end-bolt holes is particularly dangerous since it leads to Received June 6 2014 derailment of trains and consequently to inevitable accidents. It is well-known that the fatigue Accepted 17 June 2014 life of structural holed components subjected to cyclic load can be increased by generating Available online compressive hoop stresses around the holes. These beneficial residual compressive stresses 19 July 2014 Keywords significantly reduce the maximum values of the operating tensile stresses arising at the critical Rail-end-bolt holes points of the components and thus impede the formation of first mode cracks. A new approach Fatigue failure to enhancement of fatigue life of rail-end-bolt holes has been developed. The approach involves Residual stresses sequential drilling and reaming through a new combined tool and then slide diamond Cold working burnishing by a new device. The technology implementation was carried out on machine tool. Finite element simulation The process of creating residual stresses has been studied both experimentally and numerically. The experimental study was conducted by means of a modified split ring method. A reliable finite element modeling approach to the slide diamond burnishing process was developed. On this basis the process was optimized by means of a genetic algorithm. As a result the optimal combination of the governing process parameters is established which ensures both maximum depth
