 | | Mechanics of Solids
A Journal of Russian Academy of Sciences | | Founded
in January 1966
Issued 6 times a year
Print ISSN 0025-6544
Online ISSN 1934-7936 |
Archive of Issues
| Total articles in the database: | | 12882 |
| In Russian (Èçâ. ÐÀÍ. ÌÒÒ): | | 8071
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| In English (Mech. Solids): | | 4811 |
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| Keke Zhao, Jiding Zhang, Ke Sun, Wenhao Liu, and Xiaoyu Jiang, "Special Fatigue Fracture Behavior of Nanocrystalline Metals under Hydrogen Conditions," Mech. Solids. 58 (6), 2382-2398 (2023) |
| Year |
2023 |
Volume |
58 |
Number |
6 |
Pages |
2382-2398 |
| DOI |
10.3103/S0025654423601465 |
| Title |
Special Fatigue Fracture Behavior of Nanocrystalline Metals under Hydrogen Conditions |
| Author(s) |
Keke Zhao (Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, School of Mechanics and Aerospace Engineering, Southwest Jiaotong University, Chengdu, 610031 PR China)
Jiding Zhang (Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, School of Mechanics and Aerospace Engineering, Southwest Jiaotong University, Chengdu, 610031 PR China)
Ke Sun (Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, School of Mechanics and Aerospace Engineering, Southwest Jiaotong University, Chengdu, 610031 PR China)
Wenhao Liu (Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, School of Mechanics and Aerospace Engineering, Southwest Jiaotong University, Chengdu, 610031 PR China)
Xiaoyu Jiang (Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, School of Mechanics and Aerospace Engineering, Southwest Jiaotong University, Chengdu, 610031 PR China, xiaoyujiang8@sina.com) |
| Abstract |
In view of the effect of hydrogen on the mechanical behavior of nanocrystal materials, a hydrogen embrittlement model is proposed based on the method of continuous distribution dislocation from the perspective of fracture mechanics. The effects of hydrogen on mechanical parameters such as surface energy, lattice friction, shear modulus, and atomic bonding force are analyzed to investigate the effects of crack tip (CT) dislocation emission on crack propagation rate, CT plastic zone and dislocation free zone size, as well as the initiation of nanocracks at grain boundaries (GBs) and within grains under hydrogen conditions. The results show that under the presence of hydrogen, it can reduce the resistance of dislocation movement, promote the emission of crack-tip dislocations, enlarge the plastic zone at the CT, and reduce the dislocation-free zone. In addition, hydrogen atoms can accumulate at GBs and inside grains to form hydrides, reducing the surface energy of the material and making it easier for nanocracks to nucleate at GBs and inside grains. Moreover, hydrogen can exacerbate the stress concentration at the CT, resulting in an accelerated crack propagation rate. This work provides a reasonable explanation for the microscopic mechanism of hydrogen induced fracture failure of metal materials. |
| Keywords |
dislocation emission, hydrogen embrittlement, crack, propagation rate, plastic zone, dislocation-free zone |
| Received |
12 August 2023 | Revised |
20 September 2023 | Accepted |
24 September 2023 |
| Link to Fulltext |
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