Predicting the flow stress and dominant yielding mechanisms: analytical models based on discrete dislocation plasticity | |
Hu JQ(胡剑桥)2,3; Song HX4; Liu ZL1; Zhuang Z1; Liu XM(刘小明)2,3; Sandfeld S4 | |
刊名 | SCIENTIFIC REPORTS |
2019-12-31 | |
卷号 | 9页码:12 |
ISSN号 | 2045-2322 |
DOI | 10.1038/s41598-019-56252-x |
英文摘要 | Dislocations are the carriers of plasticity in crystalline materials. Their collective interaction behavior is dependent on the strain rate and sample size. In small specimens, details of the nucleation process are of particular importance. In the present work, discrete dislocation dynamics (DDD) simulations are performed to investigate the dominant yielding mechanisms in single crystalline copper pillars with diameters ranging from 100 to 800 nm. Based on our simulations with different strain rates and sample size, we observe a transition of the relevant nucleation mechanism from "dislocation multiplication" to "surface nucleation". Two physics-based analytical models are established to quantitatively predict this transition, showing a good agreement for different strain rates with our DDD simulation data and with available experimental data. Therefore, the proposed analytical models help to understand the interplay between different physical parameters and nucleation mechanisms and are well suitable to estimate the material strength for different material properties and under given loading conditions. |
分类号 | 二类/Q1 |
资助项目 | Science Challenge Project[TZ2018001] ; National Natural Science Foundation of China[11802310] ; National Natural Science Foundation of China[11772334] ; National Natural Science Foundation of China[11672301] ; Youth Innovation Promotion Association CAS[2018022] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB22040501] ; European Research Council[759419] |
WOS关键词 | CRYSTAL PLASTICITY ; SINGLE-CRYSTALS ; NUMERICAL IMPLEMENTATION ; SIZE ; DEFORMATION ; NUCLEATION ; FCC ; MICROPILLARS ; SIMULATIONS ; STRENGTH |
WOS研究方向 | Science & Technology - Other Topics |
语种 | 英语 |
WOS记录号 | WOS:000508985300043 |
资助机构 | Science Challenge Project ; National Natural Science Foundation of China ; Youth Innovation Promotion Association CAS ; Strategic Priority Research Program of the Chinese Academy of Sciences ; European Research Council |
其他责任者 | Song, Hengxu ; Liu, Xiaoming |
内容类型 | 期刊论文 |
源URL | [http://dspace.imech.ac.cn/handle/311007/81330] |
专题 | 力学研究所_非线性力学国家重点实验室 |
作者单位 | 1.Tsinghua Univ, Sch Aerosp Engn, Appl Mech Lab, Beijing 100084, Peoples R China; 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China; 3.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; 4.TU Bergakad Freiberg, Inst Mech & Fluid Dynam, Chair Micromech Mat Modelling, D-09599 Freiberg, Germany |
推荐引用方式 GB/T 7714 | Hu JQ,Song HX,Liu ZL,et al. Predicting the flow stress and dominant yielding mechanisms: analytical models based on discrete dislocation plasticity[J]. SCIENTIFIC REPORTS,2019,9:12. |
APA | 胡剑桥,Song HX,Liu ZL,Zhuang Z,刘小明,&Sandfeld S.(2019).Predicting the flow stress and dominant yielding mechanisms: analytical models based on discrete dislocation plasticity.SCIENTIFIC REPORTS,9,12. |
MLA | 胡剑桥,et al."Predicting the flow stress and dominant yielding mechanisms: analytical models based on discrete dislocation plasticity".SCIENTIFIC REPORTS 9(2019):12. |
个性服务 |
查看访问统计 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论