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Fringe 2013 pp 161-166 | Cite as

Fast Fourier Virtual Fields Method for Determination of Modulus Distributions from Full-Field Optical Strain Data

  • Truong Tho Nguyen
  • Jonathan M. Huntley
  • Ian Ashcroft
  • Pablo D. Ruiz
  • Fabrice Pierron

Abstract

Inspection of parts for manufacturing defects or in-service damage is often carried out by full-field optical techniques (e.g., digital speckle pattern interferometry, digital holography) where the high sensitivity allows small anomalies in a load-induced deformation field to be measured. Standard phase shifting and phase unwrapping algorithms provide full-field displacement and hence strain data over the surface of the sample. The problem remains however of how to quantify the spatial variations in modulus due, for example, to porosity or damage-induced micro-cracking. Finite element model updating (FEMU) is one method to solve problems of this type, by adjusting an approximate finite element model until the responses it produces are as close to those acquired from experiments as possible.

Keywords

Fourier Series Expansion Digital Holography Virtual Field Stiffness Distribution Virtual Field Method 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Truong Tho Nguyen
    • 1
  • Jonathan M. Huntley
    • 1
  • Ian Ashcroft
    • 2
  • Pablo D. Ruiz
    • 1
  • Fabrice Pierron
    • 3
  1. 1.Wolfson School of Mechanical and Manufacturing EngineeringLoughborough UniversityLoughboroughUK
  2. 2.Faculty of EngineeringNottingham UniversityUniversity ParkUK
  3. 3.Faculty of Engineering and the EnvironmentUniversity of SouthamptonHighfieldUK

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