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دانلود رایکان مقاله انگلیسی ISI با موضوع بررسی اثر انحراف قطار بر سایش و تنش تماسی چرخ و ریل

عنوان فارسی مقاله:

بررسی اثر انحراف قطار بر سایش و تنش تماسی چرخ و ریل

عنوان انگلیسی مقاله:

An investigation into the effect of train curving on wear and contact stresses of wheel and rail

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1. Introduction
The wear and rolling contact fatigue of wheels and rails cost China railways about 1.2 billions US dollars per year. The wear and fatigue occur predominantly on sharp curved tracks, joint rails and turnouts [1,2]. When a wheel rolls over a rail with a large slide, a large amount of material on the wheel or rail running surface is removed due to larger contact stresses and high temperature [3]. Fig. 1a and b illustrates, respectively, severe side wear and severe corrugation occurred on high curved rails. Such wear causes the great change of rail profile and, therefore, strongly affects the running behavior of railway vehicles, such as motion stability, riding comfort and derailment safety. The wear amount and the present shape of the rail in service are the key criteria for rail replacement at railway sites. However, the wear is often utilized to extend the use life of the rails which have small cracks on their running surfaces at railway sites. As well known, the rail has two types of damage: cracks and wear. Proper wear rate occurring on the rail running surface is able to eliminate small existing cracks or suppress the growth of existing cracks efficiently [4]. According to the mechanism many railway companies on the world developed the optimum techniques of rail grinding [5–7]. For instance, MRS in Brazil applied the advanced technique of rail grinding to the maintenance of the heavy haul track, and the use life of rails used in the heavy haul increased doubly [8]. Therefore, railway companies are much concerned with the studies and treatment of rail wear. Rail wear studies are very complicated, and involve many subjects, such as structural coupling dynamics of railway vehicle and track, rolling contact mechanics, tribology, metallurgy, and numerical method.

1) مقدمه