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Cyclic test concrete cubes

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Hello, I am trying to correlate cyclic tests for concrete cubes using GOM correlate. This allows me to plot STRESS(Shenk Machine) vs STRAIN(GOM correlate). The procedure I use is;

1; Import deformation images from a camera in black and white to GOM correlate
2; Define scale, Create a surface component and create 321 alignment
3; Define extensometer(s) at the middle of the specimen
4; Plot graphs of extensometer(s) using a change in length option.
5; Later export the extensometer(s) data in excel.csv file to match with Stress data

With all this process, I cannot have coherent strain curves from extensometer(s) using GOM.

I have tried the same method for several other specimens, but unfortunately, I cannot get a solution.

Attached are photos of my specimen and corresponding extensometer positions and also their various plots.


Please any suggestion(s) on how better I can analyse my data will be appreciated.


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Hi Ismail,

your workflow seems right. I would recommend to check the Length Change in the same direction like your extensometer is constructed.

Can you explain what kind of result you expect? Are you testing in the tensile and compressive force area or just in one of the forces? 

Nevertheless, it's quiet interesting that some of extensometers show the opposite behavior of other ones. Maybe the Facet Finding could lead to this results. 
Maybe if you increase the facet size in the construction dialog the finding will be more stable. 

Can you check the whole surface in epsilon direction and send it as an attachment? Just to have a global view of the strain. 

Greetings, Ivan

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