A Prediction Model for Hydrogen Induced Cracking in a Prestressed Wire with a Fracture Analysis

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This paper deals with the Hydrogen Induced Cracking (HIC) behavior of high strength tendon wires of a prestressed structure, exposed to aggressive environments. A decoupling technique has been suggested to evaluate crack propagations in a wire section, driven by the hydrogen diffusion. By the proposed decoupling technique, three dimensional crack propagations can be modeled effectively by two 2-dimensional finite element models, one for the fracture analysis of a round bar wire in a longitudinal section, and the other for a hydrogen diffusion model in a horizontal section. Elastic and bi-linear elastic–plastic finite element analyses have been carried out for the evaluation of crack propagations in wires of tendon. A finite element program is developed for the hydrogen diffusion-stress analyses of wires. The decoupled analysis results have been compared with available test results, and showed improved results than the linearly assumed analytical equations suggested by Forman et al.
社団法人日本鉄鋼協会の論文
2008-04-15