Effect of the mesh size of the vector displacement field on the strain estimate in the digital image correlation method

S. V. Panin, V. V. Titkov, P. S. Lyubutin

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The influence of the mesh size of the displacement vector field on the strain estimate in the digital image correlation method is considered. The reasons for the emergence and the magnitude of the strain estimate error in processing optical images of material surfaces with different textures are analyzed. The dependence of the mesh size for strain estimation on the magnitude of displacements and also on the presence and size of the discontinuity region in the strain field is studied. An adaptive algorithm for choosing the mesh size is proposed, which allows the strain calculation error to be reduced by a factor of 1.9 with simultaneous reduction of computational expenses by a factor of 2.1.

Original languageEnglish
Pages (from-to)425-434
Number of pages10
JournalJournal of Applied Mechanics and Technical Physics
Volume58
Issue number3
DOIs
Publication statusPublished - 1 May 2017

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Keywords

  • digital image correlation
  • displacement vector field
  • Gaussian noise
  • mesh size
  • strain error estimate
  • texture

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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