Release criteria, steady-state post-release gas pressures in grain face bubbles, and relaxation times for the considered release mechanisms for grain boundary gas. is the critical bubble gas pressure for grain boundary rupture and υ is a constant model parameter less than unity; see below.
|Mechanism (i) for grain||Criterion for||gas pressure,||time [s],|
|boundary fission gas release||gas release||τi|
|(1) Bubble interconnection||ϕ2 ≥ 0.48||Ph + Ps||2|
|(2) Grain boundary rupture||0|
|(3) Grain boundary microcracking||2|
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