Cristin-resultat-ID: 1374606
Sist endret: 14. september 2016, 13:47
Resultat
Poster
2016

Molecular dynamics modeling of tensile cracks in methane hydrates

Bidragsytere:
  • Henrik Andersen Sveinsson og
  • Anders Malthe-Sørenssen

Presentasjon

Navn på arrangementet: Gordon Research Conference on Natural Gas Hydrate Systems
Sted: Galveston, Texas
Dato fra: 28. februar 2016
Dato til: 4. mars 2016

Arrangør:

Arrangørnavn: Gordon Research Conferences

Om resultatet

Poster
Publiseringsår: 2016

Klassifisering

Vitenskapsdisipliner

Matematikk og naturvitenskap • Teknologi

Beskrivelse Beskrivelse

Tittel

Molecular dynamics modeling of tensile cracks in methane hydrates

Sammendrag

Production of methane from hydrates is significantly different from producing from a porous matrix, as the material itself disappears during production. Stress heterogeneities arising when methane hydrates dissociate may trigger fractures in the material, and drive further dissociation through fracture of the hydrate. The unstable nature of the gas hydrates renders it di cult to study its mechanical and failure properties experimentally. Even simple characteristics such as the mode I fracture toughness are hard to obtain. In this study, we use molecular dynamics simulations to obtain fracture properties of methane hydrates, with a main focus on crack initiation. We find that on the nanosecond scale, an important crack initiation mechanism is the slow growth of initial cracks due to melting. Rapid cracks start propagating when the system configuration reach a state close to the Griffith fracture criterion from continuum fracture mechanics. The nature of the process taking the system from an uncritical to a critical state is well described by a relation based on Arrhenius’ equation.

Bidragsytere

Henrik Andersen Sveinsson

  • Tilknyttet:
    Forfatter
    ved Matematisk-naturvitenskapelig fakultet ved Universitetet i Oslo

Anders Malthe-Sørenssen

  • Tilknyttet:
    Forfatter
    ved Kondenserte fasers fysikk ved Universitetet i Oslo
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