期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2013.04.057
关键词
VHCF (very high cycle fatigue); mu CT; Micro-computed tomography; Strain analysis; Nodular cast iron
类别
资金
- German Research Foundation (DFG) [TI 343/30-1]
The impact of very high cycle fatigue (VHCF) load conditions on the microstructure of specimens consisting of nodular cast iron is analyzed by means of micro-computed tomography (mu CT) utilizing both monochromatic synchrotron radiation and polychromatic X-ray tube radiation. Using 3D mu CT, the microstructure in the region of the smallest cross-sections of shouldered round specimens is imaged in different stages of the VHCF loading. By digital image correlation (DIC) of these tomograms strain fields are analyzed three-dimensionally. Strain levels in the range of a few percent were detected. It is proven that a localization of strain allows to predict the site of the crack which precedes and induces the macroscopic failure of the specimens. (C) 2013 Elsevier B.V. All rights reserved.
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