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Title: Microscopic Origin of Strain Hardening in Methane Hydrate
Authors: Jia, Jihui
Liang, Yunfeng
Tsuji, Takeshi
Murata, Sumihiko  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0003-1877-9537 (unconfirmed)
Matsuoka, Toshifumi
Author's alias: 村田, 澄彦
Issue Date: 24-Mar-2016
Publisher: Nature Publishing Group
Journal title: Scientific Reports
Volume: 6
Thesis number: 23548
Abstract: It has been reported for a long time that methane hydrate presents strain hardening, whereas the strength of normal ice weakens with increasing strain after an ultimate strength. However, the microscopic origin of these differences is not known. Here, we investigated the mechanical characteristics of methane hydrate and normal ice by compressive deformation test using molecular dynamics simulations. It is shown that methane hydrate exhibits strain hardening only if the hydrate is confined to a certain finite cross-sectional area that is normal to the compression direction. For normal ice, it does not present strain hardening under the same conditions. We show that hydrate guest methane molecules exhibit no long-distance diffusion when confined to a finite-size area. They appear to serve as non-deformable units that prevent hydrate structure failure, and thus are responsible for the strain-hardening phenomenon.
Rights: 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/
URI: http://hdl.handle.net/2433/215731
DOI(Published Version): 10.1038/srep23548
PubMed ID: 27009239
Appears in Collections:Journal Articles

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