Microscopic Origin of Strain Hardening in Methane Hydrate

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

    Research output: Contribution to journalArticlepeer-review

    11 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

    All Science Journal Classification (ASJC) codes

    • General

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