An Examination on Atomic-level Stress Calculations by Nanoindentation Simulation via the Quasicontinuum Method
文献类型：期刊论文
| 作者 | Y. F. Shao ; S. Q. Wang |
| 刊名 | Journal of Materials Science & Technology
 |
| 出版日期 | 2010 |
| 卷号 | 26期号:1页码:56-64 |
| 关键词 | Nanoindentation Atomistic stress Quasicontinuum molecular-dynamics dislocation nucleation mechanical-properties incipient plasticity indentation size elastic-modulus solids nanohardness deformation defects |
| ISSN号 | 1005-0302 |
| 中文摘要 | Nanoindentation simulations on single crystals Al and Cu via the quasicontinuum method have been performed. Two kinds of atomic-level local stress calculation methods, i.e. the coarse-grained local stress and the virial local stress, are employed to calculate the stress state of the contact area. Various comparisons between the coarse-grained local stress and the virial local stress have been made. Firstly, the averaged normal stress beneath the contact surface calculated by coarse-grained method agrees well with continuum mechanical pressure measurement, while the virial method gives unphysical results sometimes. Secondly, the coarse-grained results reflect the indenter size effect on the critical shear stress quite accurately, while the virial calculations fail. Thirdly, the distribution of maximum shear stress of the coarse-grained method predicts the defects nucleation locations reliably, while the distribution of virial local stress gives an incorrect prediction sometimes. Thus it is concluded that the coarse-grained method can offer a more reliable description of the local stress states of atoms in spatially inhomogeneous solids. |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://210.72.142.130/handle/321006/31431]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 推荐引用方式 GB/T 7714 | Y. F. Shao,S. Q. Wang. An Examination on Atomic-level Stress Calculations by Nanoindentation Simulation via the Quasicontinuum Method[J]. Journal of Materials Science & Technology,2010,26(1):56-64. |
| APA | Y. F. Shao,&S. Q. Wang.(2010).An Examination on Atomic-level Stress Calculations by Nanoindentation Simulation via the Quasicontinuum Method.Journal of Materials Science & Technology,26(1),56-64. |
| MLA | Y. F. Shao,et al."An Examination on Atomic-level Stress Calculations by Nanoindentation Simulation via the Quasicontinuum Method".Journal of Materials Science & Technology 26.1(2010):56-64. |
入库方式： OAI收割
来源：金属研究所
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