As shown above, determine allowable ${}_x$ as a function of ply angle by applying maximum stress,

maximum strain, and maximum work theory.

$\frac{{}_{TU}}{{}_{LU}}=0\mathrm{.}025,\frac{{}_{\text{L}\text{T}\text{U}}}{{}_{LU}}=0\mathrm{.}1,\frac{{}_{LU}^{\text{'}}}{{}_{LU}}=1$

$\frac{{}_{TU}^{\text{'}}}{{}_{LU}}=0\mathrm{.}25,v_{LT}=0\mathrm{.}25,v_{TL}=0\mathrm{.}08$

$E_L=50$Gpa,${}_{LU}=1000$Mpa,$G_{LT}=4$Gpa

Tabulate your resuhs