Solid materials have been conventionally grouped into basic classifications:
metals, ceramics, and polymers. This scheme is based primarily on
chemical makeup and atomic structure, and most materials fall into
one distinct grouping or another, although there are some intermediates.
In addition, there are three other groups of important engineering
materials--composites, semi-conductors and biomaterials. Composites
consist of two or more different materials, where as semiconductors
are utilized because of their unusual electrical characteristics;
biomaterials are implanted into the human body. We will only cover
composities for this scope of the course.