| Cite this article as: Zhu Yun-Die,Zhao Ke-Ke,Zhang Ji-Ding,Jiang Xiao-Yu. Effect of hydrogen permeation on crack propagation behavior of BCC metal [J]. J. At. Mol. Phys.(原子与分子物理学报), 2025, 42: 041008 (in Chinese) |
| Effect of hydrogen permeation on crack propagation behavior of BCC metal |
| Hits 207 Download times 53 Received:November 23, 2023 Revised:December 04, 2023 |
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| DOI
10.19855/j.1000-0364.2025.041008 |
| Key Words
Molecular dynamics Crack propagation Hydrogen permeation Plastic damage |
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| Abstract
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| In the hydrogen environment, hydrogen atoms will stick to the surface of metal materials.Over time, hydrogen atoms will penetrate into the metal and take up empty Spaces.he concentration of hydrogen atoms leads to stress concentration, which ultimately further affects the mechanical behavior of the material.The mechanical response of hydrogen at crack tip is studied by molecular dynamics method.The results show that the hydrogen adsorbed at the crack tip reduces the bonding force between atoms, resulting in a decrease in the critical applied load required for local stress concentration. The material is destroyed under the condition of lower fracture strength, and the crack propagation is promoted to a great extent.The infiltration process of adsorbent hydrogen at the crack tip under applied load was observed, and hydrogen atoms would gather in the high-stress region, resulting in a decrease in the plasticity of the material.In addition, the number of hydrogen atoms infiltrating the material will reach a maximum critical value as the calculation time increases.When the applied strain increases, the maximum number of hydrogen atoms permeating the crack tip and the time to reach the critical value will increase. |
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