On the formation mechanisms of fine granular area (FGA) on the fracture surface for high strength steels in the VHCF regime |
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| Affiliation: | 1. School of Equipment and Manufacturing, Hebei University of Engineering, Handan 056038, PR China;2. Hebei Engineering and Technology Center of Oil Country Tubular Goods, Dalipal Pipe Group Co. Ltd., Cangzhou 061000, PR China;3. School of Sciences, Hebei University of Engineering, Handan 056038, PR China;4. College of Engineering, Qufu Normal University, Jining 276826, PR China;1. LEME, University Paris Ouest Nanterre La Defense, 50, rue de Serves, Ville-d’Avray 92410, France;2. MAI – National Research University, 4, Volokolamskoe Hwy, A-80, GSP-3, Moscow 125993, Russia;3. Arts et Metiers Paris Tech, I2M, CNRS, Universite de Bordeaux, Esplanade des Arts et Metiers, Talence 33405, France;4. Aviaregister, Air. Sheremetevo-1, PO Box 54, Moscow reg., Chimkovskiy state, 141426, Russia;1. Faculty Engineering and Computer Science, University of Applied Sciences Osnabrück, 49009 Osnabrück, Germany;2. Institute for Materials Technology;3. Solid State Physics;4. Institute for Mechanics and Control, University of Siegen, 57068 Siegen, Germany;5. European Synchrotron Radiation Facility ESRF 38043 Grenoble Cedex, France;1. Dept. of Construction and Manufacturing Engineering, University of Oviedo, Campus de Viesques, 33203 Gijón, Spain;2. Royal Academy of Engineering, Don Pedro 10, 28005 Madrid, Spain;3. Royal Academy of Sciences, Valverde 24, 8004 Madrid, Spain;4. Dept. of Component Safety, Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany;5. INEGI & CONSTRUCT, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;6. Faculty of Civil Engineering and Geosciences, Delft University of Technology, 2600 GA Delft, Netherlands;1. Faculty Engineering and Computer Science, University of Applied Sciences Osnabrück, 49009 Osnabrück, Germany;2. Institute for Materials Technology, University of Siegen, 57068 Siegen, Germany;3. Solid State Physics, University of Siegen, 57068 Siegen, Germany;4. Institute for Mechanics and Control, University of Siegen, 57068 Siegen, Germany;5. European Synchrotron Radiation Facility ESRF, 38043 Grenoble Cedex, France |
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| Abstract: | The fine granular area (FGA) plays a crucial role in the VHCF regime. However, so far, the uniform understanding or conclusion about the formation mechanism of FGA has not been drawn. In view of the significance of FGA, the current studies on FGA, i.e., the FGA size, the stress intensity factor range at the periphery of FGA, the crack initiation and growth process in FGA, and the formation mechanisms of FGA, are reviewed in the present paper. The role of internal hydrogen in the VHCF regime is further discussed. In the end, two important definite conclusions are drawn based on the present investigations. |
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| Keywords: | Very high cycle fatigue Crack initiation and growth Hydrogen Fine granular area (FGA) Formation mechanism |
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