The Investigation of Plastic Behavior by Discrete Dislocation Dynamics for Single Crystal Pillar at Submicron Scale

Name: The Investigation of Plastic Behavior by Discrete Dislocation Dynamics for Single Crystal Pillar at Submicron Scale
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Yinan Cui(Autor*in)

Springer (Verlag)

Erschienen am 26. Oktober 2016

XIV, 131 Seiten

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Education:Sep. 2005-Jul. 2009, BS in School of Material Science and Engineering, Shandong UniversitySep. 2009-Jan. 2015, PhD in Department of Engineering Mechanics, Tsinghua UniversityPrizes and Awards:[1] Excellent Doctoral Dissertation, Tsinghua University 2015[2] "Gao Tian" Scholarship, Second Prize, Tsinghua University 2010,2014 (Twice)[3] Youth Outstanding Paper Award, Beijing Society of Theoretical and Applied Mechanics, 2015[4] Excellent graduates in Shandong Province, Shandong Province 2009[5] Excellent student in Shandong Province, Shandong Province 2007,2008 (Twice)[6] National Scholarship, China 2007[7] President Scholarship, Shandong University 2007[8] Top Ten League Member, Shandong University 2007[9] Prominent student in summer practice, Shandong University 2007[10] Excellent student cadre, Shandong University 2006,2007,2008 (Thrice)[11] Student Scholarship, First prize, Shandong University 2006,2007,2008 (Thrice)Publications:[1] YN Cui, ZL Liu, Z Zhuang. Theoretical and numerical investigations on confined plasticity inmicropillars. Journal of the Mechanics and Physics of Solids, 2015, 76: 127-143[2] YN Cui, ZL Liu, ZJ Wang, Z Zhuang. Atypical dislocation behavior under low amplitude cyclic loading:experiment, simulation and theoretical model. Journal of the Mechanics and Physics of Solids, (accepted)[3] YN Cui, ZL Liu, Z Zhuang. Quantitative investigations on dislocation based discrete-continuous modelof crystal plasticity at submicron scale. International Journal of Plasticity , 2015, 69, 54-72[4] YN Cui, P Lin, ZL Liu, Z Zhuang. Theoretical and numerical investigations of single arm dislocationsource controlled plastic flow in FCC micropillars. International Journal of Plasticity, 2014, 55, 279-292[5] YN Cui, ZL Liu, Z Zhuang. Dislocation Multiplication by Single Cross Slipfor FCC at Submicron Scales.Chinese Physics Letters, 2013, 30(4), 046103[6] ZJ Wang, QJ Li, YN Cui, ZL Liu, E Ma, J Li, J Sun, Z Zhuang, M Dao, ZW Shan, S Suresh. Cyclicdeformation leads to defect healing and strengthening of small-volume metal crystals. Proceedings of theNational Academy of Sciences. 2015, 112(44) 13502-13507[7] P Lin, ZL Liu, YN Cui, Z Zhuang. A stochastic crystal plasticity model with size-dependent andintermittent strain bursts characteristics at micron scale. Heal submicron-sized Al single crystal throughlow amplitude cyclic loading. International Journal of Solids and Structures, 2015, 69-70, 267-276[8] JQ Hu, ZL Liu, YN Cui, ZJ Wang, ZW Shan, Z Zhuang. Sensitive material behavior: theoretical modeland experiment for compression collapse of gold particles at submicron scale, Journal of AppliedMechanics, 2014, 81, 091007[9] Z Zhuang, YN Cui, Y Gao, ZL Liu. Advances in discrete dislocation mechanism on submicro crystalatypical plasticity. Advances in Mechanics, 2011 (Chinese Journal)[10] YN Cui, Y Gao, ZL Liu, Z Zhuang. Developing multi-scale model to study atypical crystal plasticbehavior, Advances in Heterogeneous Material Mechanics ICHMM-2011, DEStech Publications, 730-737.(International conference)[11] YN Cui, et al. Investigation of single arm source controlled plastic flow in FCC micropillar by discretedislocation dynamics and theoretical analysis. WCCM XI 2014 (International conference)

Inhalt

Intro
Supervisor's Foreword
Abstract
Parts of this thesis have been published in the following articles:Cui YN, Liu ZL, Zhuang Z. Theoretical and numerical investigations on confined plasticity in micropillars. Journal of the Mechanics and Physics of Solids, 2015, 76, 127-143 (Reproduced with Permission).Cui YN, Liu ZL, Wang ZJ, Zhuang Z. Mechanical annealing under low amplitude cyclic loading in micropillars. Journal of the Mechanics and Physics of Solids, 2016, 89, 1-15 (Reproduced with Permission).Cui YN, Lin P, Liu ZL, Zhuang Z
Acknowledgments
Contents
1 Introduction
1.1 Background and Significance
1.1.1 Size Effect of Yield Stress
1.1.2 Strain Burst and Dislocation Avalanches
1.1.3 Size Effect of Cyclic Behavior
1.2 Research Methods
1.2.1 Non-local Crystal Plasticity
1.2.2 Discrete Dislocation Dynamics Simulation Method
1.3 Research Content
References
2 Discrete-Continuous Model of Crystal Plasticity
2.1 Introduction of Simulation Method
2.1.1 Discrete Dislocation Dynamics (DDD)
2.1.1.1 Dislocation Kinetic Equation
2.1.1.2 Dislocation Reaction and Topology Update
2.1.1.3 Dislocation Cross Slip
2.1.2 Coupling DDD with Finite Element Method
2.1.2.1 Superposition Method (SPM)
2.1.2.2 Discrete-Continuous Model (DCM)
2.2 Improved Discrete-Continuous Model
2.2.1 Efficient Regularization Method
2.2.1.1 Review of Different Regularization Methods
2.2.1.2 Novel Regularization Method
2.2.1.3 Stress Field Calculation of Prismatic Loop
2.2.2 Image Force Calculation
2.2.2.1 Stress Interpolation
2.2.2.2 Hybrid DCM Method
2.2.3 Finite Deformation
2.2.3.1 Deformation Field Transfer and Surface Dislocation Treatment
2.2.3.2 Slip System Rotation
2.2.3.3 Reproduction of Slip Step
2.2.4 Application in Heteroepitaxial Film
2.2.4.1 Thermoelastic Calculation to Determine Internal Stress Field
2.2.4.2 Influence of Substrate Thickness on Dislocation Behavior
2.3 Summary
References
3 Single Arm Dislocation Source Controlled Plastic Flow in FCC Micropillars
3.1 Simulation Setup
3.2 Simulation Results
3.2.1 SAS Controlled Strain Burst
3.2.2 The Absence of Strain Hardening
3.2.3 SAS Controlled Dislocation Density Evolution
3.3 Theoretical Analysis
3.3.1 Dislocation Density Evolution Model
3.3.2 Predicting the Flow Stress
3.4 Implications for Strain Hardening at Small Scales
3.5 Summary
References
4 Confined Plasticity in Micropillars
4.1 Simulation Setup
4.2 Results and Discussion
4.2.1 Stress-Strain Curves in Coated and Uncoated Pillars
4.2.2 Dislocation Source Mechanism in Coated Micropillar
4.2.3 Back Stress in Coated Micropillar
4.2.4 The Evolution of Mobile and Trapped Dislocation
4.3 Implications on Crystal Plasticity Model
4.4 Theoretical Model to Predict Stress-Strain Curve
4.4.1 Description of the Theoretical Mode
4.4.2 Prediction of Stress-Strain Curve
4.5 Preliminary Analysis of Coating Failure Mechanism
4.5.1 High Hoop Stress of the Coated Layer
4.5.2 Transmission Effect of Dislocations Across Coating
4.6 Summary
References
5 Mechanical Annealing Under Low Amplitude Cyclic Loading in Micropillars
5.1 Simulation Setup
5.2 Simulation Results and Discussions
5.2.1 Cyclic Behavior of Collective Dislocations
5.2.2 Cyclic Instability of Dislocation Junction
5.2.2.1 Glissile Dislocation Junction
5.2.2.2 Sessile Dislocation Junction
5.3 Theoretical Model
5.3.1 Cyclic Enhanced Dislocation Annihilation Mechanism
5.3.2 Dislocation Density Influenced by Cyclic Slip Irreversibility
5.3.3 Critical Size for Mechanical Annealing
5.4 Summary
References
6 Conclusions and Outlook

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