Advanced Frangible Composite Structure

ABSTRACT: Recent SES full-scale testing of composite Instrument Landing System Glide Slope (ILS/GS) Towers indicates that frangibility for these large NAVAID structures is indeed possible. However, there is currently no clear and definitive definition of frangibility (with respect to force and energy) for an ILS Glide Slope tower; or any other airfield support structure outside of a single-pole mast. This opportunity provides a basis for collection of comprehensive baseline frangibility data, including previous testing methods and results; and seeks to develop a unified approach and roadmap to frangibility that can be applied to multiple platforms and impact scenarios. SES"approach will be to collect comprehensive frangibility data to share with the international frangibility community for the purposes of refining the definition and specifications governing frangibility on airfields. Additionally, SES will develop and employ a Tower Structural Integrity Program (TSIP) designed to collect field data of frangible composite structures under operational conditions. Data collected will help support the development of field inspection and repair techniques. BENEFIT: The collection, evaluation, and resultant frangibility data from this effort will affect commercialization potential of frangible composite structures on global commercial basis. With a better understanding of the definition of frangibility and development of improved test methods, commercial vendors worldwide will be better able to design, manufacture, and implement frangible solutions. Focused commercialization efforts of the future will be aimed at the development and marketing of products associated with the ILS/GS Tower and other airfield support structures to the point where prototype systems are designed, developed, and fully tested.