Assuming that the failure mode for longitudinal compression of unidirectional E-glass/epoxy with fiber volume fraction \(v_{\mathrm{f}}=0.6\) is a transverse tensile rupture due to Poisson strains,

(a) estimate the longitudinal compressive strength of this material and

(b) if the volume fraction of the material in part

(a) is varied, what effect would this have on the longitudinal compressive strength?