test_moissonnage_selune
type: Agent

Modelling of fatigue crack propagation assisted by gaseous hydrogen in metallic materials
type: Distribution
access URL: https://theses.hal.science/tel-00784983
format: HTML
issued: 2026-05-14T16:41:07.673135
modified: 2026-05-14T16:41:07.584477

Modelling of fatigue crack propagation assisted by gaseous hydrogen in metallic materials
type: Dataset
contact point: Organization
  fn: CCSD
keyword: metaux--fatigue
keyword: computer-simulation
keyword: continuum-damage-mechanics
keyword: spimatengineering-sciences-physicsmaterials
keyword: deformations-mecanique
keyword: simulation-par-ordinateur
keyword: endommagement
keyword: metals--hydrogen-embrittlement
keyword: metaux--fragilisation-par-lhydrogene
keyword: mecanique-de-l-milieux-continus
keyword: theses
keyword: deformations-mechancis
keyword: infoeu-reposemanticsdoctoralthesis
keyword: metals--fatigue
landing page: https://theses.hal.science/tel-00784983
description: Experimental studies in a hydrogeneous environment indicate that hydrogen created by surface reactions, then drained into the plastic zone, leads to a modification of deformation and damage mechanisms at the fatigue crack tip in metals, resulting in a significant decrease of crack propagation resistance. This study aims at building a model of these complex phenomena in the framework of damage mechanics, and to confront it with the results of fatigue crack propagation tests in high pressure hydrogen on a 15-5PH martensitic stainless steel. To do so, a cohesive zone model was implemented in the finite element code ABAQUS. A specific traction-separation law was developed, which is suitable for cyclic loadings, and whose parameters depend on local hydrogen concentration. Furthermore, hydrogen diffusion in the bulk material takes into account the influence of hydrostatic stress and trapping. The mechanical behaviour of the bulk material is elastic-plastic. It is shown that the model can qualitatively predict crack propagation in hydrogen under monotonous loadings; then, the model with the developed traction-separation law is tested under fatigue loading. In particular, the simulated crack propagation curves without hydrogen are compared to the experimental crack propagation curves for the 15-5PH steel in air. Finally, simulated fatigue crack propagation rates in hydrogen are compared to experimental measurements. The model's ability to assess the respective contributions of the different damage mechanisms (HELP, HEDE) in the degradation of the crack resistance of the 15-5PH steel is discussed.
identifier: NNT: 2012ESMA0023
issued: 2026-05-14T16:41:07.620685
language: fr
modified: 2026-05-14T16:41:07.620691