Composite Material Cavity refers to a structure made from composite materials that features one or more hollow spaces or chambers. Composite materials are engineered materials made from two or more different constituent materials with significantly different physical or chemical properties. When combined, they produce a material with characteristics different from the individual components. Common types of composite materials include polymer matrix composites (PMC’s), metal matrix composites (MMC’s), and ceramic matrix composites (CMC’s). These materials are valued for their high strength-to-weight ratios, corrosion resistance, and the ability to be tailored for specific applications.