Two-scale simulation of plasticity in molybdenum: Combination of atomistic simulation and dislocation dynamics with non-linear mobility function
Sign Up to like & getrecommendations! Published in 2020 at "Computational Materials Science"
DOI: 10.1016/j.commatsci.2020.109585
Abstract: Abstract We present multi-scale simulation of plastic deformation in molybdenum. The temperature-dependent mobility functions of screw and edge dislocations were calculated from molecular dynamics simulation with two different interatomic potentials. The simulations of screw dislocation… read more here.
Keywords: scale simulation; mobility; dislocation dynamics; simulation ... See more keywords
Spectral discrete dislocation dynamics with anisotropic short range interactions
Sign Up to like & getrecommendations! Published in 2021 at "Computational Materials Science"
DOI: 10.1016/j.commatsci.2020.110243
Abstract: Abstract Discrete dislocation dynamics models dislocation-mediated plastic deformation and microstructural evolution in solids whilst discretely representing and tracking all line defects present in the medium. Hybrid methodologies for evaluating mechanical fields using continuum approaches while… read more here.
Keywords: anisotropic short; dislocation; dislocation dynamics; spectral discrete ... See more keywords
Sudden transition of dislocation dynamics in FCC crystals at ultralow temperatures
Sign Up to like & getrecommendations! Published in 2021 at "International Journal of Plasticity"
DOI: 10.1016/j.ijplas.2021.102979
Abstract: Abstract Dislocation mobility, which is a fundamental unit of material plasticity, is determined by the predominant drag mechanism during dislocation motion. For edge dislocations in various FCC crystals, we first discover through a molecular dynamics… read more here.
Keywords: transition dislocation; fcc crystals; dislocation; dislocation dynamics ... See more keywords
Characterisation of dislocation patterning behaviour with a continuum dislocation dynamics model on two parallel slip planes equipped with a deep neural network resolving local microstructures
Sign Up to like & getrecommendations! Published in 2020 at "International Journal of Solids and Structures"
DOI: 10.1016/j.ijsolstr.2020.04.026
Abstract: Abstract The self-organisation behaviour of dislocation upon loading is still a mechanistically mysterious phenomenon. The present article aims to present a computationally tractable dislocation dynamics model, which can be used for helping analyse the mechanism… read more here.
Keywords: machine learning; dislocation; dislocation dynamics; slip ... See more keywords
Multi-objective parameter identification and optimization for dislocation-dynamics-based constitutive modeling of Ti–6Al–4V alloy
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Alloys and Compounds"
DOI: 10.1016/j.jallcom.2019.153460
Abstract: Abstract Based on the plastic deformation mechanism and dislocation dynamics theory, a constitutive model to describe the mechanical behavior of the Ti–6Al–4V alloy over a wide range of strain rates and temperatures is proposed. The… read more here.
Keywords: parameter identification; parameter; dislocation dynamics; 6al alloy ... See more keywords
The effect of stress on the cross-slip energy in face-centered cubic metals: A study using dislocation dynamics simulations and line tension models
Sign Up to like & getrecommendations! Published in 2021 at "Journal of The Mechanics and Physics of Solids"
DOI: 10.1016/j.jmps.2020.104281
Abstract: Abstract Dislocation dynamics simulations were used to calculate the energy barrier of cross-slip via Friedel–Escaig mechanism in face centered-cubic copper. The energy barrier in the unstressed case was found to be 1.9 eV, as reported… read more here.
Keywords: energy barrier; energy; stress; dislocation dynamics ... See more keywords
Discrete Dislocation Dynamics for Crystal RVEs. Part 1: Periodic Network Kinematics
Sign Up to like & getrecommendations! Published in 2022 at "Journal of the Mechanics and Physics of Solids"
DOI: 10.1016/j.jmps.2022.104861
Abstract: A novel implementation of the dislocation flux boundary condition in discrete dislocation dynamics is presented. The continuity of the individual dislocation loops in a periodic representative crystal volume (RVE) is enforced across the boundary of… read more here.
Keywords: dislocation; dislocation dynamics; rve; discrete dislocation ... See more keywords
Statistics of internal stress fluctuations in dislocated crystals and relevance to density-based dislocation dynamics models
Sign Up to like & getrecommendations! Published in 2022 at "Modelling and Simulation in Materials Science and Engineering"
DOI: 10.1088/1361-651x/ac5dcf
Abstract: A statistical analysis of internal stress fluctuations, defined as the difference between the local mean stress and stress on dislocations, is presented for deforming crystals with 3D discrete dislocation systems. Dislocation realizations are generated using… read more here.
Keywords: internal stress; field; dislocation; stress fluctuations ... See more keywords
Atomistic origins of continuum dislocation dynamics
Sign Up to like & getrecommendations! Published in 2020 at "Mathematical Models and Methods in Applied Sciences"
DOI: 10.1142/s0218202520500505
Abstract: This paper focuses on the connections between four stochastic and deterministic models for the motion of straight screw dislocations. Starting from a description of screw dislocation motion as interacting random walks on a lattice, we… read more here.
Keywords: dislocation; atomistic origins; dislocation dynamics; origins continuum ... See more keywords
Electronic Dislocation Dynamics in Metastable Wigner Crystal States
Sign Up to like & getrecommendations! Published in 2022 at "Symmetry"
DOI: 10.3390/sym14050926
Abstract: Metastable states appear in many areas of physics as a result of symmetry-breaking phase transitions. An important challenge is to understand the microscopic mechanisms which lead to the formation of the energy barrier separating a… read more here.
Keywords: dislocation dynamics; metastable wigner; wigner; wigner crystal ... See more keywords