| 纳米丝应变率效应的分子动力学模拟 |
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| 引用本文： | 徐洲, 梁海弋, 王秀喜. 纳米丝应变率效应的分子动力学模拟[J]. 固体力学学报, 2003, 24(2): 229-234. doi: 10.3969/j.issn.0254-7805.2003.02.015 |
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| 作者姓名： | 徐洲 梁海弋 王秀喜 |
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| 作者单位： | 中国科学技术大学材料力学行为和设计重点实验室,合肥,230026; 中国科学技术大学材料力学行为和设计重点实验室,合肥,230026; 中国科学技术大学材料力学行为和设计重点实验室,合肥,230026 |
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| 基金项目： | 国家自然科学基金(10172081) |
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| 摘 要： | 采用分子动力学模拟了零温时不同应变率作用下纳米丝的拉伸力学行为.计算结果表明在缺乏热激活软化机制条件下,纳米丝应变率效应呈现出与宏观应变率试验结果相一致的特征.纳米丝在不同的应变率范围具有不同的变形机制.在应变率不敏感区和敏感区,纳米丝主要以位错运动作为塑性变形机制;在应变率突变区,纳米丝通过局部原子混乱区的持续扩展乃至整体结构的非晶化作为塑性变形机制.
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| 关 键 词： | 纳米丝 应变率 分子动力学 非晶化 变变机制 |
| 修稿时间： | 2001-10-18 |
A MOLECULAR DYNAMICS SIMULATION OF THE STRAIN RATE EFFECTS ON NANOWIRE |
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| A MOLECULAR DYNAMICS SIMULATION OF THE STRAIN RATE EFFECTS ON NANOWIRE[J]. Chinese Journal of Solid Mechanics, 2003, 24(2): 229-234. doi: 10.3969/j.issn.0254-7805.2003.02.015 |
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| Authors: | Xu Zhou Liang Haiyi Wang Xiuxi Key laboratory of Mechanical Behavior Design of Materials of USTC Hefei |
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| Affiliation: | Xu Zhou,Liang Haiyi,Wang Xiuxi Key laboratory of Mechanical Behavior and Design of Materials of USTC,Hefei,230026 |
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| Abstract: | Nanowire's tensile properties under different strain rates are simulated using MolecularDynamics Method at 0 K. The results demonstrate that, without the thermo softening mechanism, therelationship between strenght and strain rate for nanowire almost exhibits the same trend as those of themacro ecperimental results. In addition, the deformation mechanism varies in different range of strainrates. In the sensitive and non-sensitive regions, dislocation behaviors dominate plasic deformation;while in the sharp-changed region, the main source causing plastic deformation is the successiveexpansion of the local disordered areas until the amorphization of the whole nanowire. |
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| Keywords: | nanowire strain rate molecular dynamics deformation mechanism amorphization |
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