Molecular dynamics is employed to simulate the growth of a helium bubble in tungsten sub-surfaces at until the bubble bursts. Simulations are performed at 933 K for W{100} and W{110} surface orientations. During the growth, a bubble moves towards the surface after punching a loop when the loop can glide towards the surface. For a given initial depth and surface orientation, a bubble must reach a critical size and gas density to burst. The critical size increases with depth. A bubble bursts more easily in W{100} than W{110}, presumably due to the more number of loop glide directions towards the surface in W{100}. Additionally, targeted simulations are performed at higher temperatures up to 2500 K. An equation-of-state is employed to model bubble pressure as a function of gas density and temperature. Subsequently, the data are used to develop a pressure-based bubble bursting model for kinetic Monte Carlo and cluster dynamics simulations.
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Presenters
Wahyu Setyawan
Pacific Northwest Natl Lab
Authors
Wahyu Setyawan
Pacific Northwest Natl Lab
Giridhar Nandipati
Pacific Northwest National Laboratory
Dwaipayan Dasgupta
University of Tennessee, Department of Nuclear Engineering, University of Tennessee, Knoxville, TN 37996, USA
Dimitrios Maroudas
University of Massachusetts Amherst, Department of Chemical Engineering, University of Massachusetts, Amherst, MA 01003, USA
Karl D Hammond
University of Missouri, Columbia, MO, University of Missouri
Sophie Blondel
University of Tennessee
Brian D Wirth
University of Tennessee, University of Tennessee Knoxville, Department of Nuclear Engineering, University of Tennessee, Knoxville, TN 37996, USA; Fusion Energy Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA
