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The first International Colloquium on Mechanical Fatigue of Metals (ICMFM) was organized in Brno, Czech Republic in 1968. Afterwards, regular Colloquia on Mechanical Fatigue of Metals started in 1972 also in Brno and were originally limited to participants from the countries of the former “Eastern Block”. They continued until the 12th Colloquium in 1994 (Miskolc, Hungary) every two years. After a twelve years long break, the Colloquia restarted in 2006 (Ternopil, Ukraine), followed by the ones in 2008 (Varna, Bulgaria), 2010 (Opole, Poland), 2012 (Brno, Czech Republic), until the last one, which was organized in 2014 in Verbania, Italy, with the aim of opening the Colloquia to participants from all countries interested in the subject of fatigue of metallic materials.
The XVIII International Colloquium on Mechanical Fatigue of Metals (ICMFM XVIII) was organized in Gijón, in September 2016, which is a city located at seaside in the delightful northern coast of Spain. This conference is aimed at facilitating and encouraging the exchange of knowledge and experiences among the different communities involved in both basic and applied research in this field, the fatigue of metals, looking at the problem of fatigue from microscopic, analytical, simulative and applicative points of view. Conference chairs express their gratitude to the members of the ICM Executive Committee and the International Advisory Committee for their strong support.
This special issue is related with the selected papers of the contributions presented in ICMFM XVIII conference. The selected papers cover a significant range of the following topics: - Cyclic plasticity and internal structure; - Low and high cycle fatigue; - Mechanisms of fatigue damage; - Fracture Mechanics; - Life prediction; - Fatigue modelling; - Multiaxial fatigue; - Fatigue-corrosion. As guest editors, we would also like to express our gratitude to all authors for their contributions and to all reviewers for their generous work. Finally, the guest editors would like to dedicate special thanks to Prof. Francesco Iacoviello, editor-in-chief of Frattura ed Integrità Strutturale/Fracture and Structural Integrity by the availability and support during the preparation of this volume.

J.A.F.O. Correia, A.M.P. De Jesus
INEGI, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal

M. Calvente, A. Fernández-Canteli
Department of Construction and Manufacturing Engineering, Univ. of Oviedo, 33203 Gijón, Spain