QUESTION $3$: $(30$p$)$ A $[0/90/0]$ graphite$/$epoxy laminate is subjected to a load of $Nx=1\frac{N}{m}.$ Using the properties of unidirectional graphite$/$epoxy $(E_1=181$GPa,$E_2=10\mathrm{.}3$GPa,$G_{12}=7\mathrm{.}17$GPa,$v_{12}=0\mathrm{.}28)$ and and assuming that each lamina is $5mm$ thick, find the global strains on top of surface of first $0$ ply$.$ The three stiffness matrices $A$

$B,$ and $D$ for a three$-$ply $\frac{0}{90}\frac{?}{0}$ graphite$/$epoxy laminate are