The composites project develops the fundamental measurement science necessary for the rational design of tough, durable and damage tolerant composites. This includes efforts to quantify the effects of fiber and resin interface chemistry on composite properties using single and multi fiber fragmentation testing. The project also develops modeling tools, which span multiple time and length scales, and feed into engineering design models. In addition, the project applies advanced microwave spectroscopy and florescence microscopy techniques to composites to reveal molecular level composite properties which control real-scale performance properties. Biobased nanocomposite concepts are also explored to leverage the impressive properties found in natural composites.