Identification of a set of macroscopic elastic parameters in a 3D woven composite: Uncertainty analysis and regularization

Renaud Gras, Hugo Leclerc, Francois Hild, Stéphane Roux, Julian David Schneider

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

Performing a single but complex mechanical test on small structures rather than on coupons to probe multiple strain states/histories for identification purposes is nowadays possible thanks to full-field measurements. The aim is to identify many parameters thanks to the heterogeneity of mechanical fields. Such an approach is followed herein, focusing on a blade root made of 3D woven composite. The performed test, which is analyzed using global Digital Image Correlation (DIC), provides heterogeneous kinematic fields due to the particular shape of the sample. This displacement field is further processed to identify the four in-plane material parameters of the macroscopic equivalent orthotropic behavior. The key point, which may limit the ability to draw reliable conclusions, is the presence of acquisition noise in the original images that has to be tracked along the DIC/identification processing to provide uncertainties on the identified parameters. A further regularization based on a priori knowledge is finally introduced to compensate for possible lack of experimental information needed for completing the identification.
Original languageEnglish (US)
Pages (from-to)2-16
Number of pages15
JournalInternational Journal of Solids and Structures
Volume55
DOIs
StatePublished - Mar 2015

ASJC Scopus subject areas

  • Mechanics of Materials
  • Modeling and Simulation
  • Materials Science(all)
  • Mechanical Engineering
  • Applied Mathematics
  • Condensed Matter Physics

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