Effect of plastic deformation on magnetic fields around fatigue crack tips of carbon tool steel (JIS,SKS93) |
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| Affiliation: | 1. Department of Mechanical and Intellectual Systems Engineering, University of Toyama, 3190, Gofuku, Toyama City, Toyama Prefecture 930-8555, Japan;2. Laboratory of Materials (LabMat), Federal University of Santa Catarina, Tridade, Florianopolis, SC 88040900, Brazil;1. Department of Mathematics, Quaid-I-Azam University 45320, Islamabad 44000, Pakistan;2. School of Natural Sciences (SNS), National University of Sciences and Technology (NUST), Islamabad 44000, Pakistan;3. Nonlinear Analysis and Applied Mathematics (NAAM) Research Group, Department of Mathematics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia;1. Purdue University, School of Mechanical Engineering, West Lafayette, IN 47907, USA;2. Schaeffler Group USA, Inc., Troy, MI 48083, USA;3. Schaeffler Technologies AG & Co. KG, Industriestraße 1-3, 91074 Herzogenaurach, Germany;4. Schaeffler Technologies AG & Co. KG, Georg-Schäfer-Straße 30, Germany;1. Centro de Engenharia, Modelagem e Ciências Sociais Aplicadas (CECS), Universidade Federal do ABC (UFABC), Avenida dos Estados, 5001, 09210-580 Santo André, SP, Brazil;2. Institut für Werkzeugmaschinen und Fabrikbetrieb (IWF), Technische Universität Berlin (TUB), Pascalstraße 8-9, 10587 Berlin, Germany |
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| Abstract: | Small cracks form in steel and then grow to cause failure. It is important to observe the plastic deformation around cracks in order to understand the fatigue level of all kinds of steel components. However, at present, it is not easy to observe the plastic deformation at the crack tip during crack growth. In this study, in order to find a new, non-destructive testing method which is related to the cracks, we investigated the relationship between magnetic fields and plastic deformation around the crack tip. A scanning Hall probe microscope (SHPM) equipped with three-dimensional GaAs film equipment was used to observe the magnetic fields around a crack tip and the plastic deformation induced by Vickers indentations in tool steel specimens (SKS93, JIS B 4404: 2006, equivalent to AISI W4 tool steel). We found that the magnetic fields around the crack tip changed during the crack growth, and also that the decrease in the magnetic fields depends on the plastic deformation size. |
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| Keywords: | Magnetic field Stress intensity factor Fatigue crack growth Scanning Hall probe microscopy Non-destructive method |
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