Epoxy break test before building wing ribs

I decided to use T-88 Epoxy for building the wing ribs. But before I started using it I ran some test samples. The mix ratio I used was done visually, so I cut some scrap cardboard and made two circles in equal size of both parts. Then I mixed it and glued it. After a couple days I pulled a gusset off and studied where it broke.

In the photos you can see the wood broke and the epoxy didn't. This is exactly what you want a test sample to look like and it's time to move forward with building.....