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![A 17th century print representing the Lernaean Hydra.](/myth/hydra.png) Lernaean Hydra (Image source: [Wikimedia Commons]( https://commons.wikimedia.org/wiki/File:Hydra_(creature).jpg))

Implementation

Here we present a weakly coupled formulation of hydrogen diffusion with stress-strain analysis that follows a 3-step procedure:

  1. an initial static analysis
  2. a mass diffusion analysis
  3. a final static analysis including cohesive elements

These cohesive elements simulate failure of the material (i.e. the presence of a crack and its opening) in presence of environmental hydrogen uptake. This considers a mechanism of local decohesion (Hydrogen Enhanced DE-cohesion, HEDE), which directly acts decreasing the cohesive strength of these finite elements. With this aim, we tailored the formulation of cohesive elements with an extensive use of Abaqus user subroutines in Fortran. Simple examples of code application to 2D cases are included in the website, to support the description and to share our finding and make it fully replicable.