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A carbon/epoxy single fiber test specimen is subjected to a uniaxial tensile stress that is increased until the fiber breaks up into pieces having a length of 0

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A carbon/epoxy single fiber test specimen is subjected to a uniaxial tensile stress that is increased until the fiber breaks up into pieces having a length of 0.625 mm. If the fiber has a diameter of 0.01 mm, a longitudinal modulus of 240 GPa, and an ultimate tensile strength of 2.5 GPa, what is the interfacial shear strength of the specimen? If the composite longitudinal modulus is 80 GPa, what applied composite stress is required to produce the condition above?