Strain measurement on a 3 point bending test

Two polymer plates are glued together and loaded in a 3 point bending test. The surface strain is measured with the Q400 DIC system

The images show the horizontal surface strain and the strain along the vertical line 1. The left image gives compression strain (blue) and tension strain (red) as a gradient over the whole specimen. After the failure of the glue the strain distribution is separated for each plate.