| ZHANG Xian,GUO Feng-lin.Finite Element Analysis of Coupling Effect between Hydrogen Diffusion and Stress Field at Crack Tip[J],47(6):240-245 |
| Finite Element Analysis of Coupling Effect between Hydrogen Diffusion and Stress Field at Crack Tip |
| Received:December 04, 2017 Revised:June 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.06.034 |
| KeyWord:hydrogen diffusion stress-induced diffusion fully coupled analysis hydrogen blistering crack propagation |
| Author | Institution |
| ZHANG Xian |
School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiaotong University, Shanghai , China |
| GUO Feng-lin |
School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiaotong University, Shanghai , China |
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| Abstract: |
| The work aims to study the diffusion and aggregation behavior of hydrogen induced by stress during the process of hydrogen blistering formation, with the effect of hydrogen diffusion on the stress field in the crack tip region taken into account. We investigate the evolution of hydrogen concentration, hydrogen pressure and stress intensity factor at the crack tip with time. By using software ABAQUS, the dynamic process of hydrogen diffusion and build-up of stress field at the crack tip, as well as the interaction between hydrogen diffusion and stress concentration are investigated through a fully coupling analysis. Initiation of extension of hydrogen blistering will be determined by crack propagation criterion in fracture mechanics. Under stress induction, hydrogen diffuses towards the vicinity of the crack tip continuously, and hydrogen concentration, hydrogen pressure and stress intensity factor in the regions near crack tip increase exponentially with time. Under the action of concentration gradient, hydrogen diffuses into the interior of material. The stress field induced by hydrogen pressure will promote the diffusion behavior of hydrogen, and the larger the stress field, the more obvious the promoting effect. This makes the hydrogen concentration in the defect increases, and the hydrogen pressure increases as well. When the stress intensity factor reaches the critical value of the crack initiation, the defect will extend and form a hydrogen blister. This process happens again and again until cracking of the hydrogen blister. |
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