Originally posted by crab
a definition of a composite structure is using two or more different materials in a structure to create a single structural unit that functions more effectively than individual materials alone.
I know that is a definition used by laymen when talking of mixed metal and concrete structures, but I've always been under the impression that aviation regards a composite structure to be some thing else.
FAA AC No: 21-26A defines a composite structure as
This advisory circular (AC) provides information about the requirements of Title 14, Code of Federal Regulations (14 CFR) part 2 1, Certification Procedures for Products, Articles, and Parts for quality systems for the manufacture of composite structures. These structures involve fiber-reinforced materials; for example, carbon (graphite), boron, aramid (Kevlar) and glass reinforced polymeric materials. This AC also provides information about essential features of quality systems for composites as mentioned in AC 20-107. Composite Aircraft Structure
Definition - Composite. A material containing two or more distinct materials (fillers, reinforcing materials, and compatible plastic resin) designed to exhibit specific performance properties