Numerical simulation of strength test on graphite moderator bricks using a continuum damage mechanics model

Experimental tests on graphite moderator bricks with keyways have been simulated using a failure model recently developed by the authors based on continuum damage mechanics. Failure of the specimens, induced by the application of pure bending moment, is characterised by unstable crack propagation, w...

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Bibliographic Details
Published in:Engineering fracture mechanics 2006-02, Vol.73 (3), p.318-330
Main Authors: Zou, Z., Fok, S.L., Marsden, B.J., Oyadiji, S.O.
Format: Article
Language:English
Subjects:
Applied sciences
Crack propagation
Damage
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Failure model
Fission nuclear power plants
Fracture mechanics (crack, fatigue, damage...)
Fundamental areas of phenomenology (including applications)
Installations for energy generation and conversion: thermal and electrical energy
Moderator bricks
Nuclear graphite
Physics
Solid mechanics
Structural and continuum mechanics
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Summary:Experimental tests on graphite moderator bricks with keyways have been simulated using a failure model recently developed by the authors based on continuum damage mechanics. Failure of the specimens, induced by the application of pure bending moment, is characterised by unstable crack propagation, with very small cracks and damage zones formed at the keyway corners immediately before final rupture. Sensitivity of the predictions to the keyway corner radius, variations in material properties and the presence of methane holes have also been investigated. Good agreement has been achieved between the predicted failure strengths and the available experimental data.
ISSN:0013-7944
1873-7315
DOI:10.1016/j.engfracmech.2005.08.002