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| Composite Materials | ||||||||||||||||||||
| Anelastic
Behavior
· For
anelastic materials such as polymers,
the application of a periodic stress can cause failure due to local heating
as well as fatigue damage.
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| ·
The
failure due to cyclic thermal softening (top) and true fatigue (bottom)
is illustrated for PMMA fatigue samples.
· The polymer matrix of a composite material may experience this type of heating during fatigue if the frequency and applied stress are correct. |
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| From: Hertzberg, "Deformation & Fracture Mechanics of Engineering Materials," Wiley (1976) | ||||||||||||||||||||