Characterisation and quantification of multiple crack growth during low cycle fatigue |
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| Affiliation: | 1. Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, E1A-07-13, 117576 Singapore;2. Department of Mechanical Engineering, Eindhoven University of Technology, P.O. Box 513 5600 MB, Eindhoven, Netherlands;1. Department of Mechanical Engineering, Ege University, Izmir 35040, Turkey;2. Interdisciplinary Division of Materials Science and Engineering, Ege University, Izmir 35040, Turkey |
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| Abstract: | The collective growth of multiple microcracks (or short cracks) during low cycle fatigue of polycrystalline Cu–30%Zn, 316L and Fe–26Cr–1Mo is investigated. Scanning electron microscopy is employed to study the evolution of surface microcrack populations, as well as the growth of individual cracks, on smooth specimens cyclically deformed at constant plastic strain amplitudes. The damage accumulation process is quantified by construction of so-called damage accumulation (DA) profiles, which reveal important information about crack growth mode, crack initiation rates, strain localisation and crack coalescence. In addition, experimentally measured microcrack growth is quantified in terms of general crack growth relations. The uniformity of these relations for different materials indicates that growth barriers dictate the main differences in fatigue microcrack growth. |
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