The strength of brittle fibers is expressed by the well-known Griffith?s formula:

where

1. The average tensile strength of as-drawn E-glass fibers is 3.45 GPa, and that of commercially available E-glass fibers is 1.724 GPa. Using Griffith?s formula, compare the critical flaw sizes in these two types of fibers. Suggest a few reasons for the difference.

2. Assuming that the critical flaw size in the as-drawn E-glass fiber is 10?4 cm, estimate the surface energy of E-glass fibers.

Transcribed Image Text:

o fu 2Egy, TTC 1/2 fu=fiber tensile strength E fiber tensile modulus Yr = surface energy c = critical flaw size с o fu 2Egy, TTC 1/2 fu=fiber tensile strength E fiber tensile modulus Yr = surface energy c = critical flaw size с

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Let the avg Tensile strength be 1 and that available commercial be given as 2 The average flaw ... View the full answer