Thesis

A numerical model for the simulation of hydrogen embrittlement mechanism in presence of dynamic hydrogen coverage

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Awarding institution
  • University of Strathclyde
Date of award
  • 2026
Thesis identifier
  • T18097
Person Identifier (Local)
  • 202151869
Qualification Level
Qualification Name
Department, School or Faculty
Abstract
  • Metallic materials are widely used in industrial structures and components. However, hydrogen embrittlement significantly degrades the mechanical behaviour of metals and alloys, compromising structural integrity in numerous industrial applications. One of the major challenges of our time is the development of models that predict the onset and propagation of damage in corrosive environments. This thesis aims to contribute to this goal by using cohesive zone models and a mechanistic characterization of the mechanical behaviour in the vicinity of the crack. First, a cohesive crack model is proposed capable of modelling damage due to static and hydrogen embrittlement. The developed numerical framework includes, in a coupled manner, mass transport, incorporating the influence of microstructural traps, and mechanical behaviour characterized by the plasticity theory at finite strains, and cracking with dynamic hydrogen coverage. The model qualitatively reproduces the relevant trends observed in the experimental tests, and the existing quantitative differences are extensively discussed. The results show that a significantly higher hydrogen concentration in the fracture process zone is required to achieve quantitative agreement. One possibility, consistent with microscale experiments and dislocation dynamics simulations, is that stress, and consequently hydrogen concentration increases considerably when plastic strain gradients accumulate in a small volume. This effect of inhomogeneous plastic deformation and its stress rise can be captured in the continuum by strain gradient theories. The model also qualitatively reproduces the hydrogen dynamic coverage and provides inside of the importance associated with the correct implementation and modelling of the mentioned phenomena with the numerical analysis.
Advisor / supervisor
  • Oterkus, Selda
  • Oterkus, Erkan
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DOI
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