Abstract
Tensile tests were performed on boron fibres and the resulting fracture stressesσf recorded. The fracture surfaces were investigated by SEM, with emphasis on the type of flaw nucleating the fracture. It was found that pre-existing, so-called proximate voids, in the boron mantle near the core-mantle interface, have transverse irregularities, large enough to create stress concentrations. The radial extensions, 2c, of fracture initiating proximate voids in mirror zones were measured from the micrographs. The obtained 2cσf relation was found to be in good agreement with the Griffith criterion for brittle fracture. In addition, the experimental log 2c-log σf plot gives some information on the value of the surface energy,γ, of boron.
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