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Direct Strain Imaging for Full Field Measurements

[+] Author Affiliations
Athanasios Iliopoulos

George Mason University, Fairfax, VANaval Research Laboratory, Washington, DC

John G. Michopoulos

Naval Research Laboratory, Washington, DC

Paper No. DETC2012-71109, pp. 1021-1031; 11 pages
doi:10.1115/DETC2012-71109
From:
  • ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 2: 32nd Computers and Information in Engineering Conference, Parts A and B
  • Chicago, Illinois, USA, August 12–15, 2012
  • Conference Sponsors: Design Engineering Division, Computers and Information in Engineering Division
  • ISBN: 978-0-7918-4501-1
  • Copyright © 2012 by ASME

abstract

Full field strain measurement techniques are based on computing the spatial derivatives of the approximation or interpolation of the underlying displacement fields extracted from digital imaging methods. These methods implicitly assume that the medium satisfies the compatibility conditions, which for any practical reason is only true in the case of a continuum body that remains continuum throughout the history of its mechanical loading. In the present work we introduce a method that can be used to calculate the strain components directly from typical digital imaging data, without the need of the continuum hypothesis and the need for displacement field differentiation. Thus it allows the imaging and measurement of strain fields from surfaces with discontinuities (i.e. small cracks). Numerical comparisons are performed based on synthetic data produced from an analytical solution for an open hole domain in tension. Mean absolute error distributions are calculated for the cases of both the traditional mesh free random grid method and the direct strain method introduced in the paper are given. It is established that the more refined representation of strain provided by this approach is more accurate everywhere in the domain, but most importantly, near the boundaries of the representation domain, where the error is higher for traditional methods.

Copyright © 2012 by ASME
Topics: Imaging

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