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Emerging Frontiers in Fatigue
International Journal of Fatigue 32 (2010) 1399
Contents lists available at ScienceDirect
International Journal of Fatigue journal homepage: www.elsevier.com/locate/ijfatigue
Editorial
Emerging Frontiers in Fatigue Foreword The field of fatigue has broadened over the past few decades in recognition that various material systems undergo in-service degradation under application of cyclic loading. The definition of fatigue failure is accordingly extended to include not only formation and propagation of cracks, but also the compromise of functional performance of a material or material system due to cyclic loading. In many cases, combined mechanical, environmental and chemical effects contribute to eventual failure in fatigue. These considerations come strongly into play for fatigue of biological materials or implants, or for materials controlled by a high density of interfaces, such as nanocrystalline or ultrafine-grained materials. Hence, fatigue inherently involves multiphysics phenomena. Moreover, fatigue is multiscale – the recent explosion of application of high resolution characterization tools combined with modeling and simulation at various levels of hierarchy (dislocations, slip bands, grains) is providing new insights into understanding microstructure-scale processes that may lead to improvements in quantifying scatter in fatigue or designing improved, fatigue-resistant materials or process routes. The papers in this special issue reflect a range of current research trends in the vibrant and vitally important subject of fati-
0142-1123/$ - see front matter Ó 2010 Elsevier Ltd. All rights reserved. doi:10.1016/j.ijfatigue.2010.03.002
gue. They are clustered according to three topical areas: the role of microstructure in fatigue, fatigue of emerging material systems, and atomistic to continuum modeling and simulation in fatigue. The first three papers highlight the role of microstructure in affecting formation and growth of cracks in advanced structural alloy systems, including implications for improved modeling. The second set of papers deal with fatigue of material systems that relate to emerging healthcare and advanced structural capabilities, namely hard biomaterials and ultrafine-grained materials. The final set of four papers consider a cascade of modeling approaches ranging from atomistic simulations to discrete dislocations to crystal plasticity as an illustration of how modeling and simulation may play a scale-appropriate role in understanding mechanisms and providing microstructure-specific predictive capabilities. I trust that you will find this special issue on Emerging Frontiers in Fatigue both inspirational and of high utility as a reference volume in your library! David L. McDowell Guest Editor Georgia Institute of Technology, Atlanta, GA, USA Available online 10 March 2010
Contents lists available at ScienceDirect
International Journal of Fatigue journal homepage: www.elsevier.com/locate/ijfatigue
Editorial
Emerging Frontiers in Fatigue Foreword The field of fatigue has broadened over the past few decades in recognition that various material systems undergo in-service degradation under application of cyclic loading. The definition of fatigue failure is accordingly extended to include not only formation and propagation of cracks, but also the compromise of functional performance of a material or material system due to cyclic loading. In many cases, combined mechanical, environmental and chemical effects contribute to eventual failure in fatigue. These considerations come strongly into play for fatigue of biological materials or implants, or for materials controlled by a high density of interfaces, such as nanocrystalline or ultrafine-grained materials. Hence, fatigue inherently involves multiphysics phenomena. Moreover, fatigue is multiscale – the recent explosion of application of high resolution characterization tools combined with modeling and simulation at various levels of hierarchy (dislocations, slip bands, grains) is providing new insights into understanding microstructure-scale processes that may lead to improvements in quantifying scatter in fatigue or designing improved, fatigue-resistant materials or process routes. The papers in this special issue reflect a range of current research trends in the vibrant and vitally important subject of fati-
0142-1123/$ - see front matter Ó 2010 Elsevier Ltd. All rights reserved. doi:10.1016/j.ijfatigue.2010.03.002
gue. They are clustered according to three topical areas: the role of microstructure in fatigue, fatigue of emerging material systems, and atomistic to continuum modeling and simulation in fatigue. The first three papers highlight the role of microstructure in affecting formation and growth of cracks in advanced structural alloy systems, including implications for improved modeling. The second set of papers deal with fatigue of material systems that relate to emerging healthcare and advanced structural capabilities, namely hard biomaterials and ultrafine-grained materials. The final set of four papers consider a cascade of modeling approaches ranging from atomistic simulations to discrete dislocations to crystal plasticity as an illustration of how modeling and simulation may play a scale-appropriate role in understanding mechanisms and providing microstructure-specific predictive capabilities. I trust that you will find this special issue on Emerging Frontiers in Fatigue both inspirational and of high utility as a reference volume in your library! David L. McDowell Guest Editor Georgia Institute of Technology, Atlanta, GA, USA Available online 10 March 2010