Toughening effects quantification in glass matrix composite reinforced by alumina platelets

A borosilicate glass matrix composite containing alumina platelets was considered to investigate toughening mechanisms and crack tip behavior in dispersion reinforced brittle matrix composites. Fracture toughness was determined by applying the chevron notched specimen technique, and fractographic an...

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Bibliographic Details
Published in:Acta materialia 2008-07, Vol.56 (12), p.2908-2918
Main Authors: Kotoul, M., Pokluda, J., Šandera, P., Dlouhý, I., Chlup, Z., Boccaccini, A.R.
Format: Article
Language:English
Subjects:
Aluminum oxide
Applied sciences
Borosilicate glasses
Crack deflection
Deflection
Exact sciences and technology
Fracture mechanics
Fracture surface roughness
Fracture toughness
Fractures
Glass matrix composites
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Platelets
Residual stresses
Roughness
Toughening
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Summary:A borosilicate glass matrix composite containing alumina platelets was considered to investigate toughening mechanisms and crack tip behavior in dispersion reinforced brittle matrix composites. Fracture toughness was determined by applying the chevron notched specimen technique, and fractographic analysis was employed to reveal the active toughening mechanisms with increasing content of reinforcement. A roughness-induced shielding effect has been quantified to prove the relation between fracture toughness and fracture surface roughness. Theoretical calculations of the fracture toughness enhancement based on a modified crack deflection model developed by Faber and Evans, combined with the influence of the increase in Young’s modulus, were found to be in good agreement with experimental data. An effect of residual stresses upon toughening of the investigated composite is discussed.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2008.02.024