Application of elastic fracture and damage mechanics models for numerical simulation of hydrogen embrittlement in steels

• Published in: Engineering computations Vol. 29; no. 6; pp. 596 - 604
• Main Authors: Palma Carrasco, Jorge, Andrade Barbosa, José Maria, Almeida Silva, Antonio, da Silva Irmão, Marcos Antonio
• Format: Journal Article
• Language: English
• Published: Bradford Emerald Group Publishing Limited 01-01-2012
• Subjects: Computer simulation; Crack initiation; Crack propagation; Damage; Deformation; Equilibrium; Evolution; Fracture mechanics; Hydrogen; Hydrogen embrittlement; Hydrogen storage; Hydrogenation; Hypotheses; Mathematical models; Mechanics; Ordinary differential equations; Propagation; Solid solutions; Steel; Steels; Studies; Finite element method; Fracture mechanics; Embrittlement; Fracture; Steels; Structural steels; Damage continuum mechanics; Hydrogen embrittlement
• ISSN: 0264-4401; 1758-7077
• DOI: 10.1108/02644401211246300

Purpose - The purpose of this paper is to present a numerical simulation of the hydrogen atomic effect on the steels fracture toughness, as well as on crack propagation using fracture mechanics and continuous damage mechanics models.Design methodology approach - The simulation was performed in an idealized elastic specimen with an edge crack loaded in the tensile opening mode, in a plane strain state. In order to simulate the effect of hydrogen in the steel, the stress intensity factor ahead of the crack tip in the hydrogenated material was obtained. The damage model was applied to simulate the growth and crack propagation being considered only two damage components: a mechanical damage produced by a static load and a non-mechanical damage produced by the hydrogen.Findings - The simulation results showed that the changes in the stress field at the crack tip and the reduction in the time of growth and crack propagation due to hydrogen effect occur. These results showed a good correlation and consistency with macroscopic observations, providing a better understanding of the hydrogen embrittlement phenomenon in steels.Originality value - The paper attempts to link the concepts of the continuous damage and fracture mechanics to achieve a better approach in the representation of the physical phenomenon studied, in order to obtain a more accurate simulation of the processes involved.