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· The cyclic-stress, steady state
crack growth rate in composites follows a Paris type of behavior as illustrated:
(da/dN)
= B ( K)m
· Curve
(A) is for a glass cloth reinforced polyester matrix in which the fibers
are woven into an orthogonal array. For this system m = 13.
· Curve (C) is for a chopped-strand glass-fiber-
mat reinforced polyester matrix. The fibers have random orientations
with respect to the tensile-tensile fatigue axis. For this case m = 6.
· Similar behavior has been found
in uniaxial composites.
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