Moon, Robert J. ; Hoffman, Mark ; Rödel, Jürgen ; Tochino, Shigemi ; Pezzotti, Giuseppe (2009)
Evaluation of crack-tip stress fields on microstructural-scale fracture in Al–Al2O3 interpenetrating network composites.
In: Acta Materialia, 57 (2)
doi: 10.1016/j.actamat.2008.09.043
Artikel, Bibliographie
Kurzbeschreibung (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.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2009 |
| Autor(en): | Moon, Robert J. ; Hoffman, Mark ; Rödel, Jürgen ; Tochino, Shigemi ; Pezzotti, Giuseppe |
| Art des Eintrags: | Bibliographie |
| Titel: | Evaluation of crack-tip stress fields on microstructural-scale fracture in Al–Al2O3 interpenetrating network composites |
| Sprache: | Englisch |
| Publikationsjahr: | Januar 2009 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Acta Materialia |
| Jahrgang/Volume einer Zeitschrift: | 57 |
| (Heft-)Nummer: | 2 |
| DOI: | 10.1016/j.actamat.2008.09.043 |
| Kurzbeschreibung (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. |
| Freie Schlagworte: | Ceramic matrix composites; Fracture; Residual stresses; Finite element analysis; Raman spectroscopy |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Nichtmetallisch-Anorganische Werkstoffe 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 18 Mai 2011 15:19 |
| Letzte Änderung: | 05 Mär 2013 09:47 |
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