An Implicit Validation Approach for Digital Image Correlation Based Strain Measurements

A digital image correlation algorithm for strain measurements with some improvements is introduced and tested. A major problem related to strain measurements with spatial resolution is the lack of simple validation of the results as the overall strain given by the test machine is not applicable as a...

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Bibliographic Details
Main Authors: Koljonen, J., Kanniainen, O., Alander, J.T.
Format: Conference Proceeding
Language:English
Subjects:
Adaptive optics
Capacitive sensors
deformation
Digital images
error estimation
Holographic optical components
Holography
material engineering
measurements based on image
Optical interferometry
Spatial resolution
Speckle
Strain measurement
Testing
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Description
Summary:A digital image correlation algorithm for strain measurements with some improvements is introduced and tested. A major problem related to strain measurements with spatial resolution is the lack of simple validation of the results as the overall strain given by the test machine is not applicable as a local strain reference estimate. An implicit error estimation approach based on statistical analysis is introduced and applied to an image test set from a uniaxial tensile test of a planar aluminum test piece. The spatial strain sampling frequency and the measurement accuracy and errors are studied, when varying a few parameters of the algorithm. An intra-validation procedure is in turn used to validate the error estimates.
DOI:10.1109/EURCON.2007.4400299