FATIGUE BEHAVIOUR OF A RAIL STEEL UNDER LOW AND HIGH LOADING RATES
作者:
Y. Cheng,
D. Chen,
F. Nogata,
期刊:
Fatigue&Fracture of Engineering Materials&Structures
(WILEY Available online 1994)
卷期:
Volume 17,
issue 1
页码: 113-118
ISSN:8756-758X
年代: 1994
DOI:10.1111/j.1460-2695.1994.tb00777.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
Abstract—In this study, both sinusoidal wave loading and rectangular pulse (impact) loading are applied to a sample of rail steel in order to compare the growth rates for a surface fatigue crack. The results show that the rectangular pulse (impact) loading gives a crack growth rate on average 5 times that of the sinusoidal wave loading but can be almost 100 times in some instances. There are distinct differences between the fractograph patterns under the two modes of loading. The fractograph under sinusoidal wave loading clearly exhibits the pearlite structure of the material but under impact loading this microstructure is not revealed; only a quasicleavage pattern is observed. Analysis of the experimental fatigue crack growth data indicated that the surface fatigue crack growth rate behaviour could be described by the Paris‐type relations
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