FEPX is a finite element software package for polycrystal plasticity.
It can model both the global and local mechanical behaviors of
large polycrystalline aggregates with complex microstructures via a
scalable parallel framework. Its primary features are:
Nonlinear kinematics capable of resolving large (or finite)
strains and large rotations
Polycrystals can be deformed to small strains (elastic regime,
elastic-plastic transition) or large strains, up to values of ~0.4,
or even more with the aid of remeshing (via Neper)
Anisotropic elasticity based on crystal symmetry (cubic and
hexagonal)
Anisotropic / crystal plasticity
- Rate-dependent slip restricted to dominant slip systems
- Isotropic or latent hardenings (interaction matrix)
- Cyclic hardening
- FCC, BCC and HCP slip systems
Multiphase polycrystals (e.g. BCC/HCP) can be simulated.
State variable evolution for crystal lattice orientation and slip
system strengths
Robust numerical methodologies with a data parallel
implementation via Message Passing Interface (MPI) routines
Simulations can be run in parallel on 1,000+ cores,
making it suitable to routinely handle 1,000 to 10,000-grain
polycrystals meshed into 3M+ elements. The code can also be run
in serial for testing or small simulations.
Generalized boundary conditions with an assortment of
standard boundary conditions
- Standard or custom boundary conditions
- Uniaxial and multiaxial loadings, either strain or
load-controlled
- Monotonic or cyclic loadings
The loading is defined as steps which prescribe specific strain
or load targets.
Wide array of output results
Users can request a variety of output to be print to file, including
(but not limited to) stress and strain tensors, crystal orientation,
deformation rates, and work.
FEPX interfaces primarily with the program Neper,
which acts as the primary pre- and post-processor. Neper handles the
generation of FEPX’s microstructure input (the mesh), the
conversion of raw output to more accessible formats, and a wide array of
output visualization.
All input files to FEPX are prescribed non-interactively, using command
lines and / or ASCII files. FEPX is written in Fortran 90/95, requires
an MPI installation (OpenMPI preferred and tested), and can be compiled
(via CMake) and run on any Unix-like system (including MacOS).
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script,
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