Code: microMegas

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Name microMegas (mM)
Status released
Release Date mM v. 1.0 - 09/2009; mMpar v. 1.0 - 01/2010
Authors Developers Team at CNRS ONERA, France; mMpar v.1.0=extension of original mM v. 3.2 + OpenMP additions, by Florina Ciorba
Contact CNRS-ONERA The Developers' Team or Sebastien Groh
License GNU GPL License
Repository mM v1.0 or mMpar
Documentation mM: README.txt (mM/trunk); README.txt (mM/tags/1.0) or mMpar: README.txt (mMpar/trunk); MSU.CAVS.CMD.2010-R0002.pdf (mMpar/doc)
Known problems None
Description MicroMegas is a 3-D DDD (Discrete Dislocation Dynamics) simulations

To report bugs, problems or to make comments please use the discussion tab above.


Contents

Overview of microMegas

MicroMegas (also known as 'mM') is an open source program for DD (Dislocation Dynamics) simulations originally developed at the 'Laboratoire d'Etude des Microstructures', CNRS-ONERA, France. mM is a free software under the terms of the GNU General Public License as published by the Free Software Foundation. Discrete dislocation dynamics (DDD) is a numerical tool used to model the plastic behavior of crystalline materials using the elastic theory of dislocations [1]. DDD is the computational counterpart to in site TEM tests. MicroMegas is a legacy simulation code used to study the plasticity of mono-crystalline metals, based on the elasticity theory that models the dislocation interactions into an elastic continuum. In crystalline materials, plastic deformation may be explained by (i) twinning, (ii) martensic transformation or/and (iii) dislocation interactions (see Figure 1).

MicroMegas is used at CAVS for modeling dislocation interactions and reactions in an elastic continuum. The code is used in a hierarchical multiscale framework of the plasticity to obtain information related to the hardening of the material (see for example, the multiscale framework presented in this review paper‎). Details of the discrete dislocations model can be found in the methodology‎ paper and in the references at the bottom of the page.

The discrete dislocation simulation code can be used for HCP, BCC and FCC materials.

Available DDD Codes

  • microMegas [2]
    • serial version mM
    • parallel version (openMP) mMpar

Setup

microMegas can be freely downloaded from the original development site at the French Aerospace Lab or from the CAVS Cyberinfrastructure Repository of Codes in two versions:

  • mM ver 1.0 – serial mM [original ver. 3.2] with various Intel Compiler Optimizations, or
  • mMpar ver. 1.0 – parallel version of mM [original ver. 3.2], where force calculations for each segment are calculated in parallel using OpenMP threads.

In this page we describe how to install, configure and run DDD simulations using mM ver. 1.0 (with Intel Compiler optimizations) and mMpar ver. 1.0 (with Intel Compiler optimizations and OpenMP threads). Installation instructions for mM ver. 1.0 and mMpar ver. 1.0 can also be found in the ‘readme’ files provided in each directory and subdirectory of the code. mM can be run in batch mode to get data analyzed with conventional graphical display programs (exemples of Gnuplot scripts are provided) or it can be used in interactive mode to simply visualize dislocations activity. Herein, we describe how to run the code in batch mode. For instructions on how to run mM in interactive mode, please refer to the ‘readme’ files provided with the code.

Before compiling microMegas on any of the HPC-CAVS computing systesm, one needs to route to the proper compiler and MPI path on the system using:

  • swsetup intel - to use the latest Intel Fortran Compiler installed on the system, and
  • swsetup openmpi-intel-64 - to use the latest version of the OpenMPI libaries, compiled with the Intel compiler for 64-bit systems.

References

Please remember to cite the relevant references from the list below when publishing results obtained with microMegas:

  • F. M. Ciorba, S. Groh and M. F. Horstemeyer. Parallelizing discrete dislocation dynamics simulations on

multi-core systems. 10th Int. Conf. on Computational Science, Procedia Computer Science, 1:1, pp. 2129-2137, 2010.

  • S. Groh, E. B. Marin, M. F. Horstemeyer, and H. M. Zbib. Multiscale modeling of the plasticity in an aluminum single crystal. Int. J. of Plasticity, 25, pp. 1456-1473, 2009.
  • S. Groh and H. M. Zbib. Advances in Discrete Dislocations Dynamics and Multiscale Modeling, J. Eng. Mater. Technol. vol. 131:4, 041209 (10 pages), 2009.
  • Multiscale Modeling of Heterogenous Materials: From microstructure to macro-scale properties. Chapter 2: Discrete Dislocation Dynamics: Principles and Recent Applications (by Marc Fivel). Edited by Oana Cazacu. Published by Wiley. ISBN: 9781848210479, 2008.
  • B. Devincre, V. Pontikis, Y. Brechet, G.R. Canova, M. Condat and L.P. Kubin. Three-dimensional Simulations of Plastic Flow in Crystals. Plenum Press: New York, M. Marechal, B.L. Holian (eds.), 1992, p. 413
  • L.P. Kubin and G. R. Canova. The modelling of dislocation patterns. Scripta Metall., 27, pp. 957-962, 1992.

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