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Microstructural strain mapping during in-situ cyclic testing of ductile iron
School of Engineering, Jönköping University, Sweden.ORCID iD: 0000-0002-5635-8023
School of Engineering, Jönköping University, Sweden.ORCID iD: 0000-0002-7527-719X
School of Engineering, Jönköping University, Sweden.ORCID iD: 0000-0003-0899-8939
Nanyang Technological University, School of Mechanical and Aerospace Engineering, Singapore.
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2018 (English)In: Materials Characterization, ISSN 1044-5803, E-ISSN 1873-4189, Vol. 140, p. 333-339Article in journal (Refereed) Published
Abstract [en]

This paper focuses on local strain distribution in the microstructure of high silicon ductile iron during cyclic loading. In-situ cyclic test was performed on compact-tension (CT) samples inside the scanning electron microscope (SEM) to record the whole deformation and obtain micrographs for microstructural strain measurement by means of digital image correlation (DIC) technique. Focused ion beam (FIB) milling was used to generate speckle patterns necessary for DIC measurement. The equivalent Von Mises strain distribution was measured in the microstructure at the maximum applied load. The results revealed a heterogeneous strain distribution at the microstructural level with higher strain gradients close to the notch of the CT sample and accumulated strain bands between graphite particles. Local strain ahead of the early initiated micro-cracks was quantitatively measured, showing high strain localization, which decreased by moving away from the micro-crack tip. It could be observed that the peak of strain in the field of view was not necessarily located ahead of the micro-cracks tip which could be because of the (i) strain relaxation due to the presence of other micro-cracks and/or (ii) presence of subsurface microstructural features such as graphite particles that influenced the strain concentration on the surface.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 140, p. 333-339
Keywords [en]
Digital image correlation, Fatigue, FIB_DIC, Micro-crack, Spherical graphite iron, Computerized tomography, Concrete aggregates, Cyclic loads, Ductility, Fatigue of materials, Graphite, Image analysis, Ion beams, Iron, Microstructural evolution, Scanning electron microscopy, Speckle, Strain measurement
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:his:diva-19116DOI: 10.1016/j.matchar.2018.04.017ISI: 000433272800036Scopus ID: 2-s2.0-85045698106OAI: oai:DiVA.org:his-19116DiVA, id: diva2:1471323
Note

© 2018 Published by Elsevier Inc.

Available from: 2020-09-28 Created: 2020-09-28 Last updated: 2021-01-07Bibliographically approved

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Salomonsson, Kent

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Kasvayee, Keivan AmiriGhassemali, EhsanSalomonsson, KentJarfors, Anders E. W.
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