3. The material of a tension link is changed from an aluminum alloy to a unidirectional graphite-epoxy composite. Calculate the volume fraction of graphite fibers required in the composite to match its longitudinal modulus with that of the aluminum alloy. What is the percentage weight saving in this material replacement? Use the properties given in Table 1-1. The elastic modulus of epoxy is 3.5 GPa, and its density is 1.2 g/cm³. (25 Points)