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Calculate the modulus of elasticity for a composite material consisting of 60 percent
by volume of continuous E-glass fiber and 40 percent epoxy resin for the matrix when
stressed under isostress conditions. The modulus of elasticity of the E glass is 72.4 GPa and
that of the epoxy resin is 3.1GPa.

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    E = E1•V1 +E2•V2 = 0.6•72.4 +
    0.4•3.1 =43.44 +1.24 =44.68 GPa

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