Question: We prepare several epoxy-matrix composites using different lengths of 3-m- diameter ZrO2 fibers and find that the strength of the composite increases with increasing fiber

We prepare several epoxy-matrix composites using different lengths of 3-μm- diameter ZrO2 fibers and find that the strength of the composite increases with increasing fiber length up to 5 mm. For longer fibers, the strength is virtually unchanged. Estimate the strength of the bond between the fibers and the matrix.

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