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Coupling finite element method with large scale atomic/molecular massively parallel simulator (LAMMPS) for hierarchical multiscale simulations

Modeling and simulation of amorphous polymeric materials

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Abstract

In this work, we have developed a multiscale computational algorithm to couple finite element method with an open source molecular dynamics code – the large scale atomic/molecular massively parallel simulator (LAMMPS) – to perform hierarchical multiscale simulations in highly scalable parallel computations. The algorithm was firstly verified by performing simulations of single crystal copper deformation, and a good agreement with the well-established method was confirmed. Then, we applied the multiscale method to simulate mechanical responses of a polymeric material composed of multi-million fine scale atoms inside the representative unit cells (r-cell) against uniaxial loading. It was observed that the method can successfully capture plastic deformation in the polymer at macroscale, and reproduces the double yield points typical in polymeric materials, strain localization and necking deformation after the second yield point. In addition, parallel scalability of the multiscale algorithm was examined up to around 100 thousand processors with 10 million particles, and an almost ideal strong scaling was achieved thanks to LAMMPS parallel architecture.

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Author information

Authors and Affiliations

  1. Tohoku University, Sendai, Miyagi, 980-8578, Japan

    Takahiro Murashima

  2. AGC Inc., Yokohama, Kanagawa, 221-8755, Japan

    Shingo Urata

  3. University of California, Berkeley, CA, 94720, USA

    Shaofan Li

Authors
  1. Takahiro Murashima
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  2. Shingo Urata
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  3. Shaofan Li
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Contributions

TM designed the concurrent coupling algorithm and developed a code to establish interface with LAMMPS. SU developed the multiscale simulation code coupling FEM and LAMMPS, and performed validation tests. TM conducted large scale simulation for the polymeric material. TM and SU wrote simulation parts of the manuscript, and SL supervised the project, wrote and summarized the manuscript. All the authors have read and approved the final manuscript.

Corresponding author

Correspondence to Takahiro Murashima.

Additional information

Contribution to the Topical Issue “Multiscale Materials Modeling”, edited by Yoji Shibutani, Shigenobu Ogata, and Tomotsugu Shimokawa.

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Murashima, T., Urata, S. & Li, S. Coupling finite element method with large scale atomic/molecular massively parallel simulator (LAMMPS) for hierarchical multiscale simulations. Eur. Phys. J. B 92, 211 (2019). https://doi.org/10.1140/epjb/e2019-100105-9

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  • DOI: https://doi.org/10.1140/epjb/e2019-100105-9

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