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Predicting the flow stress and dominant yielding mechanisms: analytical models based on discrete dislocation plasticity
Hu JQ(胡剑桥)1,2; Song HX4; Liu ZL3; Zhuang Z3; Liu XM(刘小明)1,2; Sandfeld S4
Source PublicationSCIENTIFIC REPORTS
2019-12-31
Volume9Pages:12
ISSN2045-2322
Abstract

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.

DOI10.1038/s41598-019-56252-x
Indexed BySCI
Language英语
WOS IDWOS:000508985300043
WOS KeywordCRYSTAL PLASTICITY ; SINGLE-CRYSTALS ; NUMERICAL IMPLEMENTATION ; SIZE ; DEFORMATION ; NUCLEATION ; FCC ; MICROPILLARS ; SIMULATIONS ; STRENGTH
WOS Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
Funding ProjectScience 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]
Funding OrganizationScience 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
DepartmentLNM新型材料及结构的多尺度力学
Classification二类/Q1
Ranking1
ContributorSong, Hengxu ; Liu, Xiaoming
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/81331
Collection非线性力学国家重点实验室
Affiliation1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China;
2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China;
3.Tsinghua Univ, Sch Aerosp Engn, Appl Mech Lab, Beijing 100084, Peoples R China;
4.TU Bergakad Freiberg, Inst Mech & Fluid Dynam, Chair Micromech Mat Modelling, D-09599 Freiberg, Germany
Recommended Citation
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.
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