Noise filtering in atomistic stress calculations for crystalline materials

M. Shi, N. C. Admal, E. B. Tadmor

Research output: Contribution to journalArticlepeer-review


Spatially-varying stress fields can be obtained from atomistic simulations as weighted averages over a phase function that depends on the positions and momenta of the atoms and the interatomic forces between them. However atomistic stress fields exhibit significant nonphysical noise on atomic length scales even under uniform loading conditions. This makes it difficult to obtain accurate stress estimates near atomic-scale defects such as nanocrack tips and dislocation cores. To address this issue, we develop an algorithm to filter noise in the atomistic stress for crystalline materials based on a rigorous stress-invariance condition, which leads to a new class of lattice-dependent weighting functions. Stress fields computed using these weighting functions are identically noise-free under uniform conditions, and have greatly reduced noise in general. The method is demonstrated for three example problems: (1) uniform loading of nickel aluminide, (2) a mode I crack in silicon, and (3) screw and edge dislocation cores in aluminum. The noise filtering algorithm is implemented in MDStressLab++, an open source C++ library for computing atomistic stress fields available online at

Original languageEnglish (US)
Article number104083
JournalJournal of the Mechanics and Physics of Solids
StatePublished - Nov 2020


  • Crystalline materials
  • Edge and screw dislocations
  • Microscopic stress tensor
  • Mode I crack
  • Moving least squares
  • Noise filtering

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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