Top-down constitutive modelling to capture nanoscale shear localization
文献类型：期刊论文
| 作者 | Wen JC(温济慈) ; Wei YJ(魏宇杰)
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| 刊名 | JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
 |
| 出版日期 | 2024-06-01 |
| 卷号 | 187页码:17 |
| 关键词 | Deformation localization Physics -Driven Machine Learning Constitutive Model Nanoscale shear bands |
| ISSN号 | 0022-5096 |
| DOI | 10.1016/j.jmps.2024.105629 |
| 通讯作者 | Wei, Yujie(yujie_wei@lnm.imech.ac.cn) |
| 英文摘要 | Deformation localization as exemplified by earthquakes, landslides, shear banding in solids, and failure of engineering components is of utmost importance. In practice, differentiating the mechanical behavior in such generative narrow bands from the rest part, with difference by orders of magnitude in characteristic size, flow strength, temperature, and shearing rate, is both experimentally and computationally formidable. Here we propose a machine -learning -based constitutive modeling framework to overcome this barrier borne from conventional top -down continuum modelling approach. The model enables us to realize ultra -fine resolutions for deformation in those narrow bands with high efficiency. Taking metallic glasses (MGs) as an example, our model captures well shear localization in BMGs across a broad range of temperatures (0 K to its melting point of -1000 K) and strain rates (10-4 to 108/s). We verify through this model the width of shear bands (SBs) in MGs is on the order of 5-8 nanometers, which is resulted from a cascade of (intervening) events, from localized shearing to plastic heating, subsequent temperature rise to thermal softening, and accelerated flow rate to strain -rate hardening. Temperature rise in SBs is a resultant of heat flow and plastic dissipation, but strongly depend on thermal conductivity: Low thermal conductivity facilitates strain localization and great temperature rise. It helps understanding the current controversy upon experimentally measured temperature rise ranging from several K to -1000 K. Lastly, strain rates within SBs are approximately one to two orders of magnitude higher than externally applied strain rates, and in general shearing in adiabatic SBs is faster than that in isothermal condition. |
| 分类号 | 一类/力学重要期刊 |
| WOS关键词 | BULK METALLIC-GLASS ; HIGH-TEMPERATURE DEFORMATION ; PLASTIC-DEFORMATION ; MECHANICAL-PROPERTIES ; FREE-VOLUME ; BANDS ; FLOW ; BEHAVIOR ; FRACTURE ; NANOCRYSTALLIZATION |
| 资助项目 | NSFC Basic Science Center for 'Multiscale Problems in Nonlinear Mechanics '[11988102] ; Young Elite Scientists Sponsorship Program by the Chinese Society of Theoretical and Applied Mechanics[CSTAM2022-XSC-QN4] |
| WOS研究方向 | Materials Science ; Mechanics ; Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:001218466600001 |
| 资助机构 | NSFC Basic Science Center for 'Multiscale Problems in Nonlinear Mechanics ' ; Young Elite Scientists Sponsorship Program by the Chinese Society of Theoretical and Applied Mechanics |
| 其他责任者 | Wei, Yujie |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/95280]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Wen JC,Wei YJ. Top-down constitutive modelling to capture nanoscale shear localization[J]. JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS,2024,187:17. |
| APA | 温济慈,&魏宇杰.(2024).Top-down constitutive modelling to capture nanoscale shear localization.JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS,187,17. |
| MLA | 温济慈,et al."Top-down constitutive modelling to capture nanoscale shear localization".JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS 187(2024):17. |
入库方式： OAI收割
来源：力学研究所
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