F2-5 A One-Way Coupled Crystalline Plasticity-Transient Hydrogen Diffusion Analysis to Simulate the Effect of the Heterogeneity of Stress-Strain States on Hydrogen Distributions in Microstructure

概要

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Hydrogen embrittlement is a well identified cause of material degradation and is the origin of major failure in industry. The deleterious effect of hydrogen uptake in metals and alloys is especially observed on mechanical properties. For most of the metal-hydrogen systems, fracture strength and fracture toughness are decreased and fatigue crack propagation is increased. Many attempts have already been made to investigate the metal-hydrogen interactions at macro-scale but the microstructure is generally not introduced into the analyses. The aim of this work is to propose a coupled mechanical-diffusion analysis taking into account explicitly the microstructure and using the finite element method. The stress-strain fields in artificial polycrystalline aggregates are obtained in the crystalline plasticity framework. A one-way coupled crystalline plasticity-transient hydrogen diffusion analysis is then employed to solve a boundary value problem of a large elasto-plastic deformation. The hydrogen distributions on all over the polycrystal including the hydrogen concentration within the grains and close to the grain boundaries are determined.
一般社団法人日本機械学会の論文
2009-10-10