Abstract
The recent focus of the scientific community on multiscale computer modeling techniques of nano-engineered materials stems from the desire to develop more realistic methodologies that are capable of accurately describing the varied time and length scales associated with this class of materials. Of importance is the ability to model the atomistic region using the appropriate techniques such as quantum mechanics/molecular dynamics, and the continuum region using homogenized properties. The continuity of atomistic and continuum regions in a solid necessitates a seamless coupling between these two regions. This is carried out using a transition region. In view of the large discrepancy between length and time scales in atomistic and continuum regions, the development of the transition region has been the main concern of the research community. It is the purpose of this review to critically discuss the issues concerning the transition region and the efforts made by the scientific community in treating them. In particular, this review addresses issues concerning the coupling of molecular dynamics to finite element modeling techniques. Three aspects of this review are accordingly considered. The first is concerned with the current state of atomistic–continuum coupling techniques in computational mechanics. The second is concerned with present the research conducted in the Engineering Mechanics and Design Laboratory at the University of Toronto in the field of nano-reinforced interfaces. Finally, we present the limitations of the current techniques and suggestions for improvements.
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Abbreviations
- \( \overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\rightharpoonup}$}} {a}_{i} \) :
-
Acceleration of ith atom
- \( \overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\rightharpoonup}$}} {r}_{i} \) :
-
Position of ith atom
- [B]:
-
Matrix containing derivatives of shape functions
- r ij :
-
Distance between atom i and atom j
- C i :
-
Set of atoms around representative atom i
- R f(t):
-
Bridging scale random force term
- {d}:
-
FE nodal displacement vector
- t :
-
Time
- [D]:
-
Elasticity matrix
- {T}:
-
FE surface traction vector
- {ε}:
-
FE strain vector
- \( \overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\rightharpoonup}$}} {u} \) :
-
Interpolated displacement field
- E a :
-
Atomistic energy
- U :
-
FE internal energy
- E α :
-
Representative atom energy
- \( \overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\rightharpoonup}$}} {U}_{i} \) :
-
Displacement on node i
- E c :
-
Continuum energy
- \( \overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\rightharpoonup}$}} {v}_{i} \) :
-
Velocity of ith atom
- E e :
-
Elemental energy
- \( V( {\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\rightharpoonup}$}} {r} } ) \) :
-
Interatomic potential energy
- E i :
-
Energy of atom i
- V i :
-
Individual atom potential
- E QC :
-
Quasicontinuum energy
- V ij :
-
Two-body potential
- f α :
-
Force on representative atom α
- V ijk :
-
Three-body potential
- f i :
-
EAM electron density dependent embedding energy
- W :
-
FE external work
- f(t):
-
Bridging scale interatomic force
- u, v, w :
-
x, y, z displacements in FE
- f imp(t):
-
Bridging scale impedance force
- ρ :
-
Mass density
- \( \overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\rightharpoonup}$}} {F}_{i} \) :
-
Force acting on ith atom
- θ(t−τ):
-
Bridging scale time history kernel
- \( \left\{ \Im \right\} \) :
-
FE combined body and applied force vector
- Π:
-
FE potential energy
- g c :
-
Atomic level force experienced by cluster atom c
- {σ}:
-
FE stress vector
- m i :
-
Mass of ith atom
- μ :
-
Lennard-Jones potential well depth parameter
- M A :
-
Atomic mass matrix
- ψ :
-
Lennard-Jones hard sphere radius parameter
- M :
-
Finite element mass matrix
- n α :
-
Representative atom weight function
- [N]:
-
Shape function matrix
- N e :
-
Number of atoms in element e
- N n :
-
Number of nodes
- N rep :
-
Number of representative atoms
- AFEM:
-
Atomic scale finite element method
- CADD:
-
Combined atomistic discrete dislocation method
- CB:
-
Cauchy-Born rule
- CFRP:
-
Carbon fibre reinforced plastic
- CGMD:
-
Coarse grained molecular dynamics
- CNT:
-
Carbon nanotube
- DFT:
-
Density functional theory
- EA:
-
Pure epoxy adhesive
- EAM:
-
Embedded atom method potential
- EANP:
-
Epoxy adhesive reinforced with nanopowder
- EANT:
-
Epoxy adhesive reinforced with carbon nanotubes
- FE:
-
Finite element
- FEAt:
-
Finite element atomistic method
- GFRP:
-
Glass fibre reinforced plastic
- GLARE:
-
Glass reinforced aluminum composites
- LJ:
-
Lennard-Jones potential
- MD:
-
Molecular dynamics
- MEMS:
-
Micro-electrical-mechanical devices
- MM:
-
Micromechanics
- MPM:
-
Material point method
- NRPC:
-
Nano-reinforced polymer composites
- QC:
-
Quasicontinuum method
- QM:
-
Quantum mechanics
- PDE:
-
Partial differential equation
- RVE:
-
Representative volume element
- SWCNT:
-
Single-walled carbon nanotube
- SW:
-
Stillinger-Weber potential
- MWCNT:
-
Multi-walled carbon nanotube
- TB:
-
Tight binding method
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The authors wish to acknowledge the financial support provided by Natural Sciences and Engineering Research Council (NSERC) of Canada.
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Wernik, J.M., Meguid, S.A. Coupling atomistics and continuum in solids: status, prospects, and challenges. Int J Mech Mater Des 5, 79–110 (2009). https://doi.org/10.1007/s10999-008-9087-x
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DOI: https://doi.org/10.1007/s10999-008-9087-x