dc.contributor.author | Wu, Jianyang | |
dc.contributor.author | Ning, Fulong | |
dc.contributor.author | Trinh, Thuat | |
dc.contributor.author | Kjelstrup, Signe | |
dc.contributor.author | Vlugt, Thijs J.H. | |
dc.contributor.author | He, Jianying | |
dc.contributor.author | Skallerud, Bjørn Helge | |
dc.contributor.author | Zhang, Zhiliang | |
dc.date.accessioned | 2016-03-02T13:15:25Z | |
dc.date.accessioned | 2016-04-06T08:42:37Z | |
dc.date.available | 2016-03-02T13:15:25Z | |
dc.date.available | 2016-04-06T08:42:37Z | |
dc.date.issued | 2015 | |
dc.identifier.citation | Nature Communications 2015, 6 | nb_NO |
dc.identifier.issn | 2041-1723 | |
dc.identifier.uri | http://hdl.handle.net/11250/2384189 | |
dc.description.abstract | Despite observations of massive methane release and geohazards associated with gas
hydrate instability in nature, as well as ductile flow accompanying hydrate dissociation in
artificial polycrystalline methane hydrates in the laboratory, the destabilising mechanisms of
gas hydrates under deformation and their grain-boundary structures have not yet been
elucidated at the molecular level. Here we report direct molecular dynamics simulations of
the material instability of monocrystalline and polycrystalline methane hydrates under
mechanical loading. The results show dislocation-free brittle failure in monocrystalline
hydrates and an unexpected crossover from strengthening to weakening in polycrystals. Upon
uniaxial depressurisation, strain-induced hydrate dissociation accompanied by grain-boundary
decohesion and sliding destabilises the polycrystals. In contrast, upon compression,
appreciable solid-state structural transformation dominates the response. These findings
provide molecular insight not only into the metastable structures of grain boundaries, but also
into unusual ductile flow with hydrate dissociation as observed during macroscopic
compression experiments. | nb_NO |
dc.language.iso | eng | nb_NO |
dc.publisher | Nature Publishing Group | nb_NO |
dc.title | Mechanical instability of monocrystalline and polycrystalline methane hydrates | nb_NO |
dc.type | Journal article | nb_NO |
dc.type | Peer reviewed | nb_NO |
dc.date.updated | 2016-03-02T13:15:25Z | |
dc.source.volume | 6 | nb_NO |
dc.source.journal | Nature Communications | nb_NO |
dc.identifier.doi | 10.1038/ncomms9743 | |
dc.identifier.cristin | 1281625 | |
dc.description.localcode | This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ | nb_NO |