The exact theories advanced by Curtin et al. (1991) and Hui, Phoenix, et al. (1995) to describe the fiber break evolution process in single fiber composites were found to be incorrect when compared to experimental data. In contrast to theoretical predictions, experimentally data indicates that the fragment lengths that survive to saturation decreases as the strain is increases. These results may be associated with the non-linear viscoelastic behavior of the polymer matrix, since both theories assume that the matrix is elastic perfectly plastic.It was also shown that the breaks spacings at saturation are uniform along the length of the fibers specimen, with these results apparently being independent of interfacial shear strength, fiber type, matrix type, and fiber fiber interactions. From these results, the theory of uniform spacings indicate that the cumulative distribution function for the ordered fragment lengths at saturation is a restricted beta distribution that has been previously described in the statistics of spacing theory literature.
Citation: Journal of Applied Polymer Science
Pub Type: Journals
E-glass fibers, fragmentation test, statistics