$-$We have a continuous unidirectional fiber composite, with a polyethylene matrix and carbon fiber and glass fiber reinforcement. It requires $50\%(0\mathrm{.}5$ volume fraction$)$ of polyethylene, an elastic module in the direction of the fiber maximum of $100$ GPa and a maximum density of $1\mathrm{.}3.$ What quantities of carbon fiber and glass can be used?

Solution: To complete the fvfc module $<0\mathrm{.}27,$ to complete the fvfc density$>0\mathrm{.}41,$ it is not possible.