Editing Aggregate (composite) (section)

==Comparison to fiber composites==
''Aggregate composites'' are easier to fabricate, and more predictable in their finished properties, than ''[[Fiber reinforced composite|fiber composites]]''. Fiber orientation and continuity can have a large effect, but can be difficult to control and assess. Aggregate materials are generally less expensive. Mineral aggregates are found in nature and can often be used with minimal processing.

Not all composite materials include aggregate. Aggregate particles tend to have about the same dimensions in every direction (that is, an [[Wiktionary:aspect ratio|aspect ratio]] of about one), so that aggregate composites do not display the level of [[synergy]] that fiber composites often do. A strong aggregate held together by a weak [[matrix (geology)|matrix]] will be weak in [[tension (mechanics)|tension]], whereas [[fibers]] can be less sensitive to matrix properties, especially if they are properly oriented and run the entire length of the part (i.e., a ''continuous filament'').

Most composites are filled with particles whose aspect ratio lies somewhere between oriented filaments and spherical aggregates. A good compromise is ''chopped fiber'', where the performance of filament or cloth is traded off in favor of more aggregate-like processing techniques. [[Ellipsoid]] and plate-shaped aggregates are also sometimes used.