Pellet crack mechanism at power ramps

摘要: Abstract A pellet crack mechanism has been established when power ramp occurs. Two possible cases with initial cracks are considered in this work. In the first case, tips assumed to exist cracked and strain energy density function is applied as fracture criterion. second “gaps” among fragments simulated for pattern maximum tensile principal stress used failure Most of PCMI models have reviewed derived interfacial states prescribe boundary conditions fuel which clarified uniform contact, linearly varying contact bonding. Both propagation initiation expected three types present Generally speaking, will propagate circumferential direction case study, while initiated at midplane between two adjacent study. The results presented here agreement experimental observation. Fission gas release related ramps also discussed.