Microscopic Origin of Strain Hardening in Methane Hydrate

Jihui Jia, Yunfeng Liang, Takeshi Tsuji, Sumihiko Murata, Toshifumi Matsuoka

Research output: Contribution to journalArticle

7 Citations (Scopus)

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.

Original languageEnglish
Article number23548
JournalScientific reports
Volume6
DOIs
Publication statusPublished - Mar 24 2016

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Hydrates
Strain hardening
Methane
Ice
Molecular dynamics
Compaction
Molecules
Computer simulation

All Science Journal Classification (ASJC) codes

  • General

Cite this

Microscopic Origin of Strain Hardening in Methane Hydrate. / Jia, Jihui; Liang, Yunfeng; Tsuji, Takeshi; Murata, Sumihiko; Matsuoka, Toshifumi.

In: Scientific reports, Vol. 6, 23548, 24.03.2016.

Research output: Contribution to journalArticle

Jia, Jihui ; Liang, Yunfeng ; Tsuji, Takeshi ; Murata, Sumihiko ; Matsuoka, Toshifumi. / Microscopic Origin of Strain Hardening in Methane Hydrate. In: Scientific reports. 2016 ; Vol. 6.
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