## Produce test coupons for your composite fabrication process(es)
# Author : seunghwan-ji
We tried composite glass fiber, denim and resin.
Here’s two glass fiber that have different density.
We made three different test coupon that have different layers like this.
To make test coupon we made frame with pink foam like this.
And we put gesso to prevent heat. And wax as release agent.
Then mix epoxy resin part A and B.
Hardener and main material mixing ratio is 13:100 by weight.
And put first layer and resin on it with brush.
And repeat put denim or glass fiber and resin on it.
After overlap every layers done. We put anvil on it to give pressure.
We also tried 3D shaped composite.
Carve pink foam with trimmer and put 5layers like denim-glass fiber-denim glass fiber-denim.
After all the layers done, we use vacuum bagging to stick well. we did it like this.
It cured well and has hard surface.
These are the outputs.
Three test coupon have different layer each.
And they have different rigidity.
Yongwoo’s coupon is strongest, followed by Sunghyun’s and Seunghwan’s.
But there is variables at proficiency and we think that’s more important fact.