Engineering Board Exam Reviewer · Engineering Materials · hard

In a longitudinally loaded composite with 60% fibers (Ef = 230 GPa) and 40% matrix (Em = 3.5 GPa), what percentage of the load is carried by the fibers?

1. 60.0%
2. 98.5%
3. 99.0%
4. 1.0%

Answer

C. 99.0%

Solution

Under isostrain, Ff/Fc = VfEf/(VfEf + VmEm) = 138/(138 + 1.4) = 99.0%.

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