Microcrack Resistant Materials for Composite Tanks

In response to Missile Defense Agency need, Triton will develop a new lightweight carbon fiber composite for use for the Airborne Laser (ABL) Program. The replacement of the currently used aluminum tanks with composites for the Chemical Oxygen IodineLaser (COIL) in particular will result in up to 40% weight saving resulting in both fuel savings for the ABL (greater firing capacity) and jet fuel savings (extended flight range). Despite the cost and weight advantages associated with the use ofcomposite structures for this application, several drawbacks have existed such as laminate microcracking from thermal cycling and infiltration of liquids and gases into the composite structure. Triton's innovative materials and design solutions willalleviate these problems by preventing microcracking. Our solution to the problem is a two prong approach using our nanomaterials: i) Use of thermally stable, low CTE nanomaterial-based resins to lessen the fiber-resin mismatch attributed to microcrackingdue to thermal cycling; ii) Use of high chemical barrier polymer films inside the composite tank that prevent infiltration of gases or liquids, which cause chemical or physical degradation of the composite structure. We have identified several commercialapplications for matrix materials with high thermal stability and resistance to microcracking: Aerospace structures: chemical storage tanks, cryogen storage tanks, booster/orbiter aeroshell, standoff cones; Advanced vehicle concepts - under the hoodapplications for racing and passenger vehicles.