considering carbon fibers and the following stress-strain curve. The carbon fibers are elastic up to failure and have an elastic modulus of 240 GPa and ultimate tensile strength of 3 GPa. Assuming that the composites are stressed parallel to the unidirectional glass fibers, calculate (a)the composite stress at 0.75% and 1.15% strains for each composite (b)the minimum and critical fiber volume fractions for both composites. Stress, MPa 70- 35 Matrix B Matrix A 1 10 Strain, percent