These are the test coupons for the composites project I’ve been working. Visually they look good but they also need to have the same fiber to resin ratio. We’ll see if they do
http://www.flickr.com/photos/canyon289/4366790042/sizes/l/
ugh…t-boning then is hard! then again, if you have the CNC ability, then it prob wold be easier than cutting, angling and gluing on tabs 
It was done by waterjet. Luckily a company had both low enough prices for me to fit it in my meager mandated budget and awesome enough service and skill to do it well and fast!
For anyone else that’s interested it’s Hydrocut Waterjet in Huntington Beach. Excellent service and pricing!!
wish we had one…nooooo, had to buy a ultrasonic ply cutter…I think our biggest problem and time bottle-neck is cutting samples. One day…one day.
Well, I tried testing the unidirectional and it didn’t go so well. The tabs sheared off at about 8000 lbf. I gotta redesign the coupons and then try again!
How thick are your samples? Those samples seem miiighty thick for unidirectional.
If you have a balanced layup, remember, a 0/90 fabric will be half of what the uni will be at the same width/thickness.
Mine run like this:
width
0.527"
Thickness
0.04"
Gauge
10"
Area sqin
0.02108
Stress PSI
343263.76
Max Load lbf
7236
Modulus psi
34.04
Well I kinda did biff the matrix fiber ratios. The bidirectional is 65 percent volume fraction fiber and the uni is 52. However the dry fabric widths are different so I don’t know how that affects the final width. The modulus I got for the Uni was 11 ksi and the bidirectional was about 7 ksi. I couldn’t get failure results because the tabs sheared before the composite broke
Specs
width
0.5"
Thickness
Uni .31 Bi .23
Gauge
Is gauge the length of the specimen?
Area sqin
No idea
Stress PSI
N/A
Max Load Before shear lbf
8000 psi