Functionally graded composite fan containment case

A fan containment case for a gas turbine engine comprising:

• a first inner layer comprising an aramid fiber;
• a second layer outside the first inner layer, wherein the second layer comprises a hybrid carbon-fiberglass having a first fabric architecture;
• a third layer outside of the second layer, wherein the third layer comprises carbon and has a second fabric architecture, and the first fabric architecture is different from the second fabric architecture;
• and
• a fourth outer layer outside of the third layer, wherein the fourth outer layer comprises a third fabric architecture that is different from the first and second fabric architectures;
• wherein the first architecture of the second layer comprises a triaxial braid utilizing a first set of weave angles, and the second architecture of the third layer comprises a triaxial braid utilizing a second set of weave angles that is different than the first set of weave angles.

A fan containment case for a gas turbine engine comprising:

• a first inner layer comprising an aramid fiber and having a triaxial braid, two-dimensional weave, or three-dimensional weave fabric architecture;
• a second layer outside the first inner layer, wherein the second layer comprises a triaxial braid that includes first, second, and third fibers, the second and third fibers utilizing weave angles of about +/−x relative to the first fibers;
• a third layer outside of the second layer, wherein the third layer comprises a triaxial braid that includes first, second, and third fibers, the second and third fibers utilizing weave angles of about +/−y relative to the first fibers, wherein y<x;
• and
• a fourth outer layer outside of the third layer and comprising a non-crimp fabric or a triaxial braid.