Numerical models for simulating hydrogen diffusion and embrittlement in high strength steels

  1. Díaz Portugal, Andrés
Supervised by:
  1. Jesús Manuel Alegre Calderón Director

Defence university: Universidad de Burgos

Fecha de defensa: 20 October 2017

  1. María Covadonga Betegón Biempica Chair
  2. Isidoro Iván Cuesta Segura Secretary
  3. Emilio Martínez Pañeda Committee member
  4. Sergio Cicero González Committee member
  5. Javier Sánchez Montero Committee member

Type: Thesis

Teseo: 515454 DIALNET lock_openRIUBU editor


This thesis presents and discusses hydrogen diffusion modelling as a first step in predicting and mitigating hydrogen-assisted fracture. Hydrogen embrittlement is a common phenomenon that degrades metals and alloys, and related failures are usual in industry. However, the relationship between hydrogen and the transition from ductile to brittle modes of fracture is not entirely clear. Therefore, the present work has the objective of establishing, validating, implementing and analysing a consistent numerical model for hydrogen diffusion, in a Continuum Mechanics framework by means of a Finite Element software. In addition, a notched tensile test is simulated, demonstrating that the combination of diffusion with damage models might predict brittle fracture. Vessels storing hydrogen are also simulated with the purpose of finding hydrogen distributions near stress concentrators; influence of cyclic loads and compressive residual stresses are also evaluated in these deposits.