Effect of stress ratio on long life fatigue behavior of high carbon chromium bearing steel under axial loading
Effect of stress ratio on long life fatigue behavior of high carbon chromium bearing steel under axial loading
复制标题
DOI：
10.1016/j.ijfatigue.2005.04.018
复制
发表时间：
2006-11-01
影响因子：
6
通讯作者：
Oguma, Noriyasu
中科院分区：
文献类型：
--
作者：
Sakai, Tatsuo;Sato, Yosuke;Oguma, Noriyasu
在轴向载荷下，通过实验研究了应力比对轴承钢（日本工业标准：SUJ2）在长寿命区间疲劳性能的影响。结果表明，得到了由表面诱发断裂和内部夹杂物诱发断裂的S - N曲线叠加而成的双相S - N特性，这与旋转弯曲中的相应结果相似。在后一种断裂模式下的断口上必然能观察到鱼眼状标记，并且在鱼眼的中心发现有夹杂物。这种钢在长寿命区间的疲劳断裂是通过三个不同的过程发生的：（1）形成细晶粒区（FGA）特征区域；（2）裂纹扩展形成鱼眼；（3）快速裂纹扩展导致灾难性断裂。应力比对FGA尺寸的影响得到了证实，并且这种影响可以通过FGA前沿的应力强度因子很好地解释。（c）2006爱思唯尔有限公司。保留所有权利。
Effect of the stress ratio on fatigue properties of a bearing steel (JIS:SUJ2) in the long life regime was experimentally examined under axial loading. As a result, the duplex S-N characteristics given by superposition of S-N curves for surface-induced fracture and interior inclusion-induced fracture were obtained similar to the corresponding results in rotating bending. Fish-eye marks were necessarily observed on the fracture surfaces failed in the latter fracture mode and an inclusion was found at the center of the fish-eye. The fatigue fracture of this steel in the long life regime occurred through three different processes of. (1) formation of the characteristic area of Fine Granular Area (FGA), (2) crack propagation to form the fish-eye and (3)rapid crack propagation to cause the catastrophic fracture. The effect of the stress ratio on the FGA size was confirmed and, this effect was well explained by the stress intensity factor at front of the FGA. (c) 2006 Elsevier Ltd. All rights reserved.