Phase field modelling to predict hydrogen-assisted failures in elastic-plastic materials

  1. A. Díaz 2
  2. E. Martínez-Pañeda 3
  3. L.B. Peral 12
  4. I.I. Cuesta 2
  5. J.M. Alegre 2
  1. 1 Universidad de Oviedo
    info
    Universidad de Oviedo

    Oviedo, España

    ROR https://ror.org/006gksa02

    Geographic location of the organization Universidad de Oviedo
  2. 2 Universidad de Burgos
    info
    Universidad de Burgos

    Burgos, España

    ROR https://ror.org/049da5t36

    Geographic location of the organization Universidad de Burgos
  3. 3 Imperial College London
    info
    Imperial College London

    Londres, Reino Unido

    ROR https://ror.org/041kmwe10

    Geographic location of the organization Imperial College London
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Journal:
Revista española de mecánica de la fractura

ISSN: 2792-4246

Year of publication: 2023

Issue: 5

Pages: 169-174

Type: Article

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Abstract

Prediction of hydrogen-related failures through numerical modelling is still an open field due to the complexity and multiscale nature of the involved phenomena. In the present work, Finite Element approaches for hydrogen embrittlement are summarised and compared, highlighting the advantages of phase field models. Phase field formulation is not only limited to brittle failures but includes a ductile extension and hydrogen effects are modelled through a reduction in a local fracture energy, which is typically based on atomistic calculations of hydrogen-enhanced decohesion but can also be experimentally fitted. The coupled framework includes hydrogen transport and is implemented in the commercial software Comsol Multiphysics. A case study of a single-edge cracked plate is analysed to show the influence of fracture energy or hardening. In addition, hydrogen embrittlement at different concentration levels is captured and strain rate effects are reproduced due to the transient character of hydrogen redistribution.

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