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Crack initiation, kinking and nanoscale damage in silica glass: multimillion-atom molecular dynamics simulations. (English) Zbl 1207.74011
Pyrz, R. (ed.) et al., IUTAM symposium on modelling nanomaterials and nanosystems. Proceedings of the IUTAM symposium held in Aalborg, Denmark, May 19–22, 2008. Dordrecht: Springer (ISBN 978-1-4020-9556-6/hbk). IUTAM Bookseries 13, 13-17 (2009).
Summary: We present molecular dynamics (MD) simulations of crack kinking, growth, propagation and healing at the nanometer scale in a confined, pre-cracked silica glass subjected to dynamic mode II loading. The pre-crack tip kinks towards maximum mode I tension and nanometer scale cavities are nucleated in the tensile region ahead of the kink. Nanocavities coalesce with kinks to form wing cracks. Dynamics of wing cracks are dominated by coalescence with damage cavities, and the growth and healing of crack and cavities are controlled by confinement.
For the entire collection see [Zbl 1151.74006].
MSC:
74A45 Theories of fracture and damage
74A60 Micromechanical theories
74S30 Other numerical methods in solid mechanics (MSC2010)
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