I did it last year (or at least, a pre-requisite of it). They held the Region II science fair at USC, which had the winners shipped off to ISEF (Top boy and girl projects overall).
It was actually kind of funny - I did a project in the botany section (lettuce and hydroponics/organoponics) and ended up winning 1st place in the Computer Science division because I wrote a program to do image analysis on pictures of my lettuce for leaf area (which was my dependent variable). I've got a really cool certificate from Intel for it, but didn't get anywhere near high enough ranking to make it to the big league
Any more detail on your project? What kinds of composite, what kind of testing?
Oh, and let us know how you do!
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D5 Robotics, Team 1293: Programmer, CAD'er, Mechanical, Electrical... I've made my rounds.
Events: 2006-2009 Palmetto Regional
Website: http://d5robotics.org/