Publication: Monitoring the fatigue-induced damage evolution in ultrafine-grained interstitial-free steel utilizing digital image correlation
Program
KU-Authors
KU Authors
Co-Authors
Niendorf, T.
Dadda, J.
Maier, H. J.
Karaman, İbrahim
Publication Date
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Type
Embargo Status
Journal Title
Journal ISSN
Volume Title
Alternative Title
Abstract
The digital image correlation (DIC) technique was successfully utilized to detect fatigue-induced damage and monitor its evolution in ultrafine-grained interstitial-free steels of three different microstructures in the low-cycle fatigue regime. Specifically, visualization of strain localization with DIC allows for detecting the crack initiation sites after only a few cycles into the deformation. Furthermore, optical microscopy, atomic force microscopy and electron backscatter diffraction analyses revealed a direct correlation between elongated grains and the crack initiation sites. The results of a crystal plasticity model demonstrated that higher overall stresses are prevalent in the microstructures with elongated grains, which is attributed to strain localizations, and corresponding stress concentrations responsible for crack initiation. Overall, the current findings show that DIC is a novel and promising non-destructive technique for determining the crack initiation sites at the very early stages of cyclic deformation.
Source
Publisher
Elsevier Science Sa
Subject
Nanoscience, Nanotechnology, Materials science, Multidisciplinary, Metallurgy metallurgical engineering
Citation
Has Part
Source
Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing
Book Series Title
Edition
DOI
10.1016/j.msea.2009.04.053