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164 Engineered interfaces in jiber reinforced composites
growth for fiber pull-out than for fiber push-out. Also, the final crack length at
steady state is significantly shorter for fiber pull-out than fiber push-out. In the same
context, the increase in the relative displacements is more difficult for fiber pull-out
than for fiber push-out under an identical stress amplitude. These results are more
clearly demonstrated by the critical value pc, which is smaller for fiber pull-out than
for fiber push-out. All these results of the parametric study based on the power law
function imply that the degradation of interface frictional properties is more severe
in fiber push-out than in fiber pull-out under cyclic loading of given values of
Po, P1,N and 60.
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