Crack propagation rate by hydrogen embrittlement in high strength steels: trap- controlled difusion

Author(s): A. Ridruejo, J. Sanchez, E. Torres, N. Rebolledo
Paper category: Proceedings
Book title: Proceedings of the International Conference on Sustainable Materials Systems and Structures (SMSS2019) Durability, Monitoring and Repair of Structures
Editor(s): Ana Baričević, Marija Jelčić Rukavina, Domagoj Damjanović, Maurizio Guadagnini
ISBN: 978-2-35158-217-6
e-ISBN: 978-2-35158-218-3
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 300-308
Total Pages: 813
Language: English

Abstract: Hydrogen embrittlement is often attendant upon structural steel failure. Earlier atomic-level studies of the effect of hydrogen in periodic iron lattices concluded that hydrogen establishes no significant chemical bonds with iron. Rather, it introduces internal stress that weakens the
iron-iron bonds and lowers fracture toughness. Hydrogen-induced crack growth was simulated here. Hydrogen transport, stress gradients and the variations in fracture toughness were analysed jointly in a multiphysics finite element model. Fracture behaviour has been simulated
in the literature using both linear and polynomial cohesive process models. The findings show that the choice of the cohesive model affects the results for crack growth rate and hydrogen concentration profiles. This study explored the effect of hydrogen entrapment on hydrogen transport, concentration contours and crack growth rate.

Online publication :2019
Publication type : full_text
Public price (Euros) : 00