Modeling the multiaxial strength of H-451 nuclear grade graphite

Characterization of Porosity Development in Oxidized Graphite using Automated Image Analysis Techniques

“…Although many types of pores, with various shape and size, are present in the graphite structure, it is generally agreed that large, slit-shaped pores are the most damaging to the graphite integrity [4]. Initiation of fracture cracks and propagation of cracks to sub-critical length before catastrophic failure are components of theoretical models of graphite fracture [5]. However, when a component of the graphite structure (of which the binder has the weakest oxidation resistance) is gasified through oxidation, it is conceivable that, along with density variations, the material's microstructure and basic strength properties would be affected [6,7].…”

Modeling Stress Strain Relationships and Predicting Failure Probabilities For Graphite Core Components

“…For the simpler models Burchell's (2007) data has more information than is necessary. For some models all the constants cannot be approximated because there is not enough appropriate data for that particular model.…”

“…Monte Carlo simulation with importance sampling will be used to compute component failure probabilities. The three classical models will be compared with the experiment results obtained from Burchell (2007).…”

“…During operations the graphite components are subjected to complex stress states arising from structural loads, thermal gradients, neutron irradiation damage, and seismic events, any and/or all of which can lead to failure. As discussed by Burchell, et al (2007) failure theories that predict reliability of graphite components for a given stress state are important.…”

“…In the following section several common failure criterion models will be introduced and the constants for the models are characterized using biaxial failure data generated by Burchell (2007). For the simpler models Burchell's (2007) data has more information than is necessary.…”