Full-field identification methods: comparison of FEM updating and integrated DIC

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Abstract

Full-field identification methods are increasingly used to adequately identify constitutive parameters to describe the mechanical behavior of materials. This research investigates the more recently introduced, one-step method of Integrated Digital Image Correlation (IDIC) with respect to the most commonly used, two-step method of Finite Element Model Updating (FEMU), which uses a subset-based digital image correlation algorithm. To make the comparison as objective as possible, both methods are implemented in the most equivalent manner and use the same FE-model. Various virtual test-cases are studied to assess the performance of both methods when subjected to different error sources: (1) systematic errors, (2) poor initial guesses for the constitutive parameters, (3) image noise, (4) constitutive model errors, and (5) experimental errors. Results show that, despite the mathematical similarity of both methods, IDIC produces less erroneous and more reliable results than FEMU, particularly for more challenging test-cases exhibiting small displacements, complex kinematics, misalignment of the specimen, and image noise.

Original languageEnglish
Title of host publicationAdvancement of Optical Methods in Experimental Mechanics, Volume 3
Subtitle of host publicationProceedings of the 2016 Annual Conference on Experimental and Applied Mechanics
EditorsS. Yoshida, L. Lamberti, C. Siammarella
Place of PublicationDordrecht
PublisherSpringer
Pages191-197
Number of pages7
ISBN (Electronic)978-3-319-41600-7
ISBN (Print)978-3-319-41599-4
DOIs
Publication statusPublished - 2017
Event2016 SEM International Congress and Exposition on Experimental and Applied Mechanics - Hilton Orlando Lake Buena Vista, Orlando, United States
Duration: 6 Jun 20169 Jun 2016

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
Volume2017

Conference

Conference2016 SEM International Congress and Exposition on Experimental and Applied Mechanics
CountryUnited States
CityOrlando
Period6/06/169/06/16
OtherDynamic Behavior: Integrating Experimental Mechanics

Keywords

  • Finite element model updating
  • Full-field measurement
  • Integrated digital image correlation
  • Inverse methods
  • Parameter identification

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