An investigation about the influence of deep rolling on fatigue crack growth in railway axles made of a medium strength steel
An investigation about the influence of deep rolling on fatigue crack growth in railway axles made of a medium strength steel
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DOI：
10.1016/j.engfracmech.2014.09.016
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发表时间：
2014-11
影响因子：
5.4
通讯作者：
D. Regazzi;S. Beretta;M. Carboni
中科院分区：
文献类型：
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作者：
D. Regazzi;S. Beretta;M. Carboni
近年来，人们开始采用深度轧制来提高车轴的疲劳强度，但对这一现象的科学分析和研究却很少。为此，本文研究了该工艺对EA4T钢车轴疲劳裂纹扩展的影响。首先，采用工业深轧工艺制备了特殊的足尺试样。然后通过X射线衍射测量所得的压缩残余应力场，并在小尺寸SE（B）和SE（T）试样上进行实验性裂纹扩展活动，研究材料在非常负的应力比下的行为。然后对全材料进行裂纹扩展试验，规模标本和结果成功地比较，通过一个简单的无相互作用的预测模型建立考虑到材料的特性和测量的行为残余应力场
Over the last years, deep rolling has been adopted to improve the fatigue strength of railway axles, but very few scientific analyses and studies of this phenomenon are available in the literature. For this reason, the present research investigates some aspects related to the influence of this technological process on fatigue crack growth in railway axles made of EA4T steel grade.Firstly, special full-scale specimens were prepared applying the industrial deep-rolling process. The measurement of the resulting compressive residual stress field was then performed by X-ray diffraction and prompted an experimental crack growth campaign, on small-scale SE(B) and SE(T) specimens, to investigate the behavior of the material at very negative stress ratios.Crack growth tests were then carried out on full-scale specimens and the results successfully compared to those obtained by a simple no interaction predictive model built up considering both the characterized behavior of the material and the measured residual stress field.