5) Fatigue Resistance is good
Resistance to Fatigue in Carbon Fiber Composites is good. However when carbon fiber fails it usually fails
catastrophically without much to announce its imminent break. Damage in tensile fatigue is seen as reduction in
stiffness with larger numbers of stress cycles, (unless the temperature is high)
Test has shown that failure is unlikely to be a problem when cyclic stresses coincide with the fiber orientation. Carbon
fiber is superior to E glass in fatigue and static strength as well as stiffness.
The orientation of the fibers and the different fiber layer orientation, have a great deal of influence on how a composite
will resist fatigue (as it has on stiffness). The type of forces applied also result in different types of failures. Tension,
Compression or Sheer forces all result in markedly different failure results. Paper on test of carbon fiber composites
intended for automotive use. American Institute of Aeronautics and Astronautics, test for materials to be used in wind
turbines blades.