Dear all,
I wonder if the Digital Image Correlation (DIC) techniques could be used to measure the strain profile of a RC beam. So far, most of the available cases I have seen was about measuring the direct axial strain due to axial test.
I am not sure what do you mean by strain profile, but if you are wondering if you could measure strains on the visible surface (one side of the RC beam), then the answer is Yes, you can. You should check GOM website, I believe software for 2D images is free of charge, but some interesting matlab codes can be found also. You need to have very precise calibration tool whatsoever, if you want to have reliable results.
Dear Haitham Al-Thairy,
The strain profile is obtained in the form of 'Strain contours' based on the deformation fields (2-D) obtained on the surface of RC beam specimens. However, the correlations are often affected by the formation of macro cracks. For this reason, the validation is done for the deformation data rather than the strain data.
Check these articles to better your understanding:
1. Article Use of Digital Image Correlation for the Evaluation of Flexu...
2. Article Evaluation of cracking resistance potential of geosynthetic ...
Best regards,
Vinay
You can use simple experiment to compare the DIC results with the previous results.
The uniform strain field can be tested by strain gauge.The non-uniform strain field, especially the high-strain gradient strain field, will be complicated. Please refer to the following paper:
Effects of various shape functions and subset size in local deformation measurements using DIC
X Xu, Y Su, Y Cai, T Cheng, Q Zhang
Experimental Mechanics 55 (8), 1575-1590
302015
Theoretical estimation of systematic errors in local deformation measurements using digital image correlation
X Xu, Y Su, Q Zhang
Optics and Lasers in Engineering 88, 265-279
222017
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