Fatigue & Fracture of Engineering Materials & Structures

Cover image for Vol. 37 Issue 10

Edited By: Youshi Hong (Editor-in-Chief), Paolo Lazzarin and Richard W. Neu (Editors) and Yukitaka Murakami (Editor-at-Large)

Impact Factor: 1.058

ISI Journal Citation Reports © Ranking: 2013: 53/126 (Engineering Mechanical); 156/251 (Materials Science Multidisciplinary)

Online ISSN: 1460-2695

Virtual Issue: Very-high-cycle fatigue of high-strength alloys: mechanism and modeling


Introduction
Youshi Hong, Institute of Mechanics, Chinese Academy of Sciences

Since the 1980s, an increasing number of experimental investigations have revealed that for high strength metallic materials, fatigue failure may occur beyond the loading cycles of 107 at a relatively low load below traditional fatigue limit. Thereafter, the research of fatigue behaviour at failure cycles beyond 107 and up to 1011, namely very-high-cycle fatigue (VHCF) also termed ultra-high-cycle fatigue, ultra-long-life fatigue or gigacycle fatigue, has attracted a number of investigators in the fatigue research community.

This trend is driven by modern engineering applications, including aircraft, automobiles, ships, railways, bridges, etc., for which the components and structures are required to endure a fatigue life larger than 107 and up to 1011 loading cycles. This trend is also due to the nature of the VHCF process, especially the characteristics of crack initiation and its early growth, which differs from that which prevails in low-cycle or high-cycle fatigue regime.

For instance, in the regime of low-cycle or high-cycle fatigue, cracks originate from the specimen surface due to localized plastic deformation with persistent slip mechanism; on the contrary, in the regime of VHCF cracks are prone to initiate at the specimen subsurface or interior with a distinct feature of so-called “fish-eye” embracing “fine-granular-area (FGA)” or “optical-dark-area” originated from an inclusion. The formation of FGA and fish-eye, i.e. the stage of crack initiation and early growth of VHCF, consumes the majority of 95% or even more with respect to the total fatigue life, and the crack growth or extension rate within FGA is so slow of lower than 10-12 m/cycle. The efforts of modelling and simulations on VHCF behaviour are therefore based on such characteristics so that to explain the dominate mechanism and to predict the fatigue life containing VHCF phase.

As an international journal for structural integrity, FFEMS has encouraged research on VHCF not only by the publication of papers in regular issues but also by soliciting Special Issues in past years. In recent years, with the progress of VHCF research, the original papers in this field have continuously appeared in FFEMS. In order to group together such papers so that they will be easily accessed by the investigators of this field and by readers who are interested in this topic, the editor of FFEMS takes advantage of the recent initiative launched by the publisher, to form the Virtual Issue: “Very-high-cycle fatigue of high-strength alloys: mechanism and modelling”, selecting VHCF papers published between 2006 and 2012

This Virtual Issue contains 10 papers which cover the recent results of experiments, analyses, modelling and simulations on VHCF. We hope this free-to-access Virtual Issue will be of benefit to our readers.

A cumulative damage model for fatigue life estimation of high-strength steels in high-cycle and very-high-cycle fatigue regimes
Sun, C., Xie, J., Zhao, A., Lei, Z. and Hong, Y.
(2012) Fatigue Fract. Eng. Mater. Struct. 35, 638–647.

Cumulative model of very high cycle fatigue.
Stepanskiy, L. G.
(2012) Fatigue Fract. Eng. Mater. Struct. 35, 513–522.

Fish-eye shape prediction with gigacycle fatigue failure.
Duan, Z., Shi, H. and Ma, X.
(2011) Fatigue Fract. Eng. Mater. Struct. 34, 832–837.

Long fatigue life critical crack lengths.
Plumtree, A. and Untermann, N.
(2010) Fatigue Fract. Eng. Mater. Struct. 33, 320–330.

Fatigue crack initiation detection by an infrared thermography method.
Wagner, D., Ranc, N., Bathias, C. and Paris, P. C.
(2010) Fatigue Fract. Eng. Mater. Struct. 33, 12–21.

Very high cycle fatigue behaviour of 2000-MPa ultra-high-strength spring steel with bainite-martensite duplex microstructure.
Nie, Y. H., Fu, W. T., Hui, W. J., Dong, H. and Weng, Y. Q.
(2009) Fatigue Fract. Eng. Mater. Struct. 32, 189–196.

Influence of inclusion size on S-N curve characteristics of high-strength steels in the giga-cycle fatigue regime.
Lu, L. T., Zhang, J. W. and Shiozawa, K.
(2009) Fatigue Fract. Eng. Mater. Struct. 32, 647–655.

The effect of frequency on the giga-cycle fatigue properties of a Ti-6Al-4V alloy.
Takeuchi, E., Furuya, Y., Nagashima, N. and Matsuoka, S.
(2008) Fatigue Fract. Eng. Mater. Struct. 31, 599–605.

Fatigue behaviour of SiCp-reinforced aluminium composites in the very high cycle regime using ultrasonic fatigue.
Huang, J., Spowart, J. E. and Jones, J.W.
(2006) Fatigue Fract. Eng. Mater. Struct. 29, 507–517.

Thermographic analysis in ultrasonic fatigue tests.
Xue, H., Wagner, D., Ranc, N. and Bayraktar, E.
(2006) Fatigue Fract. Eng. Mater. Struct. 29, 573–580.

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