Page 122 - Engineered Interfaces in Fiber Reinforced Composites

Chapter 4. Micromechanics of stress transfer 105

z=-L 24
I I
cia=

c-
y I I I

Fig. 4.7. Distributions of (a) fiber axial stress, uf, (b) matrix axial stress, umz, and (c) interface shear stress.
q, along half the embedded fiber length, L, in the fiber fragmentation test.

Table 4.2
Interface properties of carbon fiberxpoxy matrix composites and Weibull parameters of carbon fibersa.

Interface properties XA I Gi, = 13 J/m2 40 = 8.4MPa p = 0.8
XAlOO Gi, = 37 J/m2 40 = 8.4MPa p = 1.25
=
Weibull parameters XA1 c~s(2h) 2.45GPa 2L,, = 12mm m = 3.6
XAIOO cn(2h) = 2.64GPa 2150 = 12mm in = 4.6
"Zhou et al. (1994)

integrating the stress components acting in the constituents over the volume of
respective regions:

ut = UCJ + ub ,

(4.36)