Cristin-resultat-ID: 1066656
Sist endret: 21. januar 2015, 15:07
NVI-rapporteringsår: 2013
Resultat
Vitenskapelig artikkel
2013

3D cohesive modelling of hydrogen embrittlement in the heat affected zone of an X70 pipeline steel

Bidragsytere:
  • Antonio Alvaro
  • Vigdis Olden og
  • Odd Magne Akselsen

Tidsskrift

International Journal of Hydrogen Energy
ISSN 0360-3199
e-ISSN 1879-3487
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2013
Publisert online: 2013
Volum: 38
Hefte: 18
Sider: 7539 - 7549

Importkilder

Scopus-ID: 2-s2.0-84878775547
Isi-ID: 000321165400039

Beskrivelse Beskrivelse

Tittel

3D cohesive modelling of hydrogen embrittlement in the heat affected zone of an X70 pipeline steel

Sammendrag

A three-dimensional finite cohesive element approach has been developed and applied in order to simulate the crack initiation of hydrogen-induced fracture. A single edge notched tension specimen of an X70 weld heat affected zone was simulated. The results were compared to similar two-dimensional plane strain model and the cohesive parameters were calibrated to fit the experimental results. The three dimensional simulations gave higher values in terms of opening stress at the stress peak, plastic strain levels at the crack tip and hydrogen lattice concentration when compared with two-dimensional simulations under the same global net section stress levels. Nevertheless a higher cohesive strength was needed for the 2D model for the onset of crack propagation. The best fit to the experimental data were obtained for a cohesive strength of 1840 MPa and 1620 MPa for the 2D and 3D simulation respectively. The critical opening was assigned to 0.3 mm for both models. The threshold stress intensities KIC,HE were 142 MPa√m and 146 MPa√m for the 2D and 3D models, respectively.

Bidragsytere

Antonio Alvaro

  • Tilknyttet:
    Forfatter
    ved Institutt for maskinteknikk og produksjon ved Norges teknisk-naturvitenskapelige universitet
Aktiv cristin-person

Vigdis Olden

  • Tilknyttet:
    Forfatter
    ved Materialer og nanoteknologi ved SINTEF AS

Odd Magne Akselsen

  • Tilknyttet:
    Forfatter
    ved Materialer og nanoteknologi ved SINTEF AS
  • Tilknyttet:
    Forfatter
    ved Institutt for maskinteknikk og produksjon ved Norges teknisk-naturvitenskapelige universitet
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