In the Late Classic Period Yaxchilan was one of the most powerful Maya cities along the course of the Usumacinta, with Piedras Negras as its major rival. Architectural styles in subordinate sites in the Usumacinta region demonstrate clear differences that mark a clear boundary between the two kingdoms.
Answered by The Community. Making the world better, one answer at a time. Steel is not usually considered a composite, as it is macroscopically homogeneous. However, some steel types, including classical iron-carbon steel, can be considered as metal-matrix composites, as they contain a second phase... sometimes.
Composites comprise two materials, such as a metallic mesh and a resin, the combination of which also depends on the properties required. Materials from which the item is to be manufactured are noted on the engineering drawing using standard material and grade codes. It is important that manufacturers do not interchange materials because the switch may make the products susceptible to failures.