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Evaluation of crack-tip stress fields on microstructural-scale fracture in Al–Al2O3 interpenetrating network composites

Moon, Robert J. and Hoffman, Mark and Rödel, Jürgen and Tochino, Shigemi and Pezzotti, Giuseppe (2009):
Evaluation of crack-tip stress fields on microstructural-scale fracture in Al–Al2O3 interpenetrating network composites.
In: Acta Materialia, pp. 570-581, 57, (2), ISSN 13596454, [Online-Edition: http://dx.doi.org/10.1016/j.actamat.2008.09.043],
[Article]

Abstract

The influence of local microstructure on the fracture process at the crack tip in a ceramic–metal composite was assessed by comparing the measured stress at a microstructural level and analogous finite element modelling (FEM). Fluorescence microprobe spectroscopy was used to investigate the influence of near-crack-tip stress fields on the resulting crack propagation at the microstructural scale. The high spatial resolution was effective at mapping the localized crack-tip stress distributions within the complex Al–Al2O3 phase morphologies, where the localized stress distribution about the crack tip within the Al2O3 phase could be measured. Regions of high-localized tensile stress within the microstructure resulting from a combination of applied load and thermal residual stress were identified and could be used in predicting the subsequent crack extension direction. Stress distributions calculated from spectroscopy results were compared with microstructural level FEM of the same structure and general agreement between the two techniques was observed.

Item Type: Article
Erschienen: 2009
Creators: Moon, Robert J. and Hoffman, Mark and Rödel, Jürgen and Tochino, Shigemi and Pezzotti, Giuseppe
Title: Evaluation of crack-tip stress fields on microstructural-scale fracture in Al–Al2O3 interpenetrating network composites
Language: English
Abstract:

The influence of local microstructure on the fracture process at the crack tip in a ceramic–metal composite was assessed by comparing the measured stress at a microstructural level and analogous finite element modelling (FEM). Fluorescence microprobe spectroscopy was used to investigate the influence of near-crack-tip stress fields on the resulting crack propagation at the microstructural scale. The high spatial resolution was effective at mapping the localized crack-tip stress distributions within the complex Al–Al2O3 phase morphologies, where the localized stress distribution about the crack tip within the Al2O3 phase could be measured. Regions of high-localized tensile stress within the microstructure resulting from a combination of applied load and thermal residual stress were identified and could be used in predicting the subsequent crack extension direction. Stress distributions calculated from spectroscopy results were compared with microstructural level FEM of the same structure and general agreement between the two techniques was observed.

Journal or Publication Title: Acta Materialia
Volume: 57
Number: 2
Uncontrolled Keywords: Ceramic matrix composites; Fracture; Residual stresses; Finite element analysis; Raman spectroscopy
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 18 May 2011 15:19
Official URL: http://dx.doi.org/10.1016/j.actamat.2008.09.043
Identification Number: doi:10.1016/j.actamat.2008.09.043
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