Abstract
A novel approach is introduced for the experimental determination of critical fiber length in carbon fiber reinforced carbon (CFRC) composites. Critical fiber length is investigated using double lap joint samples. The transition of failure mode from bonding failure to fiber fraction with increasing overlap length correlates with the critical fiber length. Tested overlap lengths were in the range of 4–100mm. For CFRC at hand, failure mode changes at an overlap length of 26±2mm. Hence critical fiber length is derived as lc=52±4mm.
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